VOLUME NR 1
PHYSICAL CHEMISTRY
UDK 543.872
S. N. Rasulova, V. P. Guro, M. A. Ibragimova, A. B. Ibragimov, U. R. Ernazarov, Kh. F. Adinaev
PURIFICATION OF NITRATE MOLYBDENUM-CONTAINING SOLUTIONS FROM IRON, COPPER WITH EXTRACTION OF MOLYBDENUM AND RHENIUM
Institute of General and Inorganic Chemistry of the Academy of Sciences of the Republic of Uzbekistan
Abstract. Background. The molybdenite concentrate is oxidized by roasting followed by ammonia (now soda) leaching of the cinder in RPA PRMHA of Almalyk MMC JSC. However, earlier it was subjected to nitric acid opening, with the accumulation of sludge from processing, rich in nitrates, containing residues of molybdenum, rhenium.
Purpose: to propose methods for cleaning nitrate molybdenum-sludge solutions of the plant from iron, copper, with the extraction of molybdenum and rhenium
Methodology. Samples of Mo-concentrate and slurry solutions of the plant were used. The concentrations of Cu(II), Fe(III), Mo(VI), Re(VII) ions were determined spectrometrically (Agilent 7500 IСP); The kinetics of nitric acid leaching of molybdenum disulfide was studied by the rotating disk method. Extraction and ionic flotation methods were also used.
Originality. Methods for purification of nitrate molybdenum-sludge solutions from iron, copper impurities, with selective extraction of the target products from them: Mo and Re are substantiated.
Findings. The kinetic characteristics of Mo-concentrate leaching in nitric acid were obtained by the rotating disk method. Methods for extracting a number of metals by extraction and froth flotation are proposed.
Key words: Mo-concentrate, nitric acid, oxidation, leaching, recovery, purification, extraction, froth flotation.
Highlights:
- kinetics of Mo-concentrate oxidation in 1800 seconds of the reaction;
- the copper ion extractant stearin was used at a temperature of 65°C;
- additional precipitation of molybdenum in the form of ferrimolybdate;
- ionic flotation of rhenium with trialkylamine.
References
1. Zelikman A. N., Krein O. E., Samsonov G. V. Metallurgy of rare metals. M.: Metallurgy Publishing House, 1964, pp. 107-127. (in Russian)
2. Potashnikov Yu.M., Lutsik V.I., Chursanov Yu.V. Study of the interaction of molybdenite with nitric acid. Izvestiya vuzov. Non-ferrous metallurgy.–1984.– No. 1.– P. 57-61. (in Russian)
3. TI 00193950-71-04-013:2019 instead of TI 12810-5-1:2008 Technological instruction for the production of molybdenum salts (ammonium tetramolybdate and ammonium paramolybdate). (in Russian)
4. TI 00193950-71-04-014:2019 instead of TI 00193950-71-04-013:2019 Technological instruction for the production of molybdenum salts. (in Russian)
5. Ts 00193950-074:2018. Molybdenum middling cinder. Uzstandard. 2018. (in Russian)
6. Nikitina JI.C. Decomposition of molybdenite products with nitric acid. Non-ferrous metals, 1983, No. 4, pp. 63-67 (in Russian)
7. Lutsik, V.I. Kinetics of hydrolytic and oxidative dissolution of metal sulfides. Monograph / V.I. Lutsik, A.E. Sobolev. - Tver (Russia): TSTU, 2009. - 140 p. (in Russian)
8. Aleksandrov P.V. Development of a hydrometallurgical method for extracting molybdenum from intermediate products of ore dressing at the Bugdainskoye deposit. Diss. for the competition uch. Art. Ph.D., M .: print. MISiS.-2011.-148 p. (in Russian)
9. S. N. Rasulova, V. P. Guro, U. N. Ruziev, et al., Kinetics of Reagent Oxidation of Molybdenum Sulfide in Sulfuric Acid Electrolyte. Part 2. // Uzbek. chem. jurn - 2020. - No4. - P.3-9. (in Russian)
10. Pleskov V., Filinovsky V. Yu. Rotating disk electrode.- M.: Nauka, 1972.-225 p. (in Russian)
11. Dauletbakov T.S., Smagulov M.O., Amirkhan A.A. Extraction of gold from cakes from the leaching of gold-arsenic concentrate // Bulletin of the Kazakh National Technical University. K. I. Satpaeva. ISSN: 1680-9211 - 2011, Almaty. Abstract base of scientific journals. Document scope: P. 209-2012. MRNTI: 01/53/05. P. 5270. (in Russian)
12. Patent RU 2280088 C2. Method for extracting molybdenum from acidic solutions. Author: Starkov Yu.A. Appl. 10.02.Published. 07/20/2006. (in Russian)
13. Polant A.A., Troshkina I.D., Chekmarev A.M. Rhenium metallurgy. M.: Science. - 2007. - 298 p. (in Russian)
14. Kakovsky, I.A. Thermodynamics and kinetics of hydrometallurgical processes / I.A. Kakovsky, S.S. Naboychenko. Almaty: Nauka, 1986. 272 p. (in Russian)
15. Yurkevich, Yu.L. Decomposition of molybdenite by nitric acid / Yurkevich Yu. L., Shapiro K. Ya. // Metallurgy of tungsten, molybdenum and niobium. M.: Nauka, 1967. P. 53-56. (in Russian)
To cite this article: S. N. Rasulova, V. P. Guro, M. A. Ibragimova, A. B. Ibragimov, U. R. Ernazarov, Kh. F. Adinaev. Purification of nitrate molybdenum-containing solutions from iron, copper with extraction of molybdenum and rhenium // Uzbek chemical journal. -2023. – Nr1. - Pp.3-9.
Received: 16.08.2022; Accepted: 03.10.2022; Published: 20.03.2023
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UDK 541.64:537.3
S. R. Otajonov, N. T. Kattaev, Kh. I. Akbarov, A. T. Mamadalimov
SYNTHESIS AND ELECTROCHEMICAL PROPERTIES OF AN ELECTRICALLY CONDUCTIVE POLYMER BASED ON POLYVINYLIMIDAZOLE
National University of Uzbekistan named after Mirzo Ulugbek otajonovsardor1994@gmail.com
Abstract. Background. Solving the problems inherent in electrically conductive polymers (insolubility in water, low atmospheric resistance) is topical.
Purpose. Synthesis of polyvinylimidazole derivative with improved electrical conductivity and study of its electrochemical properties.
Methodology. Structural features of the synthesized polymers were evaluated using IR spectroscopy and diffuse reflectance electron spectroscopy. The electrical conductivity of the samples was studied by measuring their voltammetric characteristics (CVC).
Originality. The features of the chemical reaction of polyvinylimidazole with 3-bromopropylamine were revealed. It is shown that an increase in the hydrophilicity of the functional groups of the polymer matrix leads to an increase in the electrical conductivity of the polyvinylimidazole derivative.
Findings. Poly(1-N-vinyl-3(-3-aminopropyl) imidazolonium bromide was obtained by the interaction of polyvinylimidazole and 3-bromopropylamine hydrobromide. 1-N-vinyl-3(-3-aminopropyl) imidazolium bromide has a high electrical conductivity (1.25∙10-2 S/m).
Key words: radical polymerization, polyvinylimidazole, electrically conductive polymer, band gap, electrical conductivity.
Highlights:
- radical polymerization of vinylimidazole;
- interaction of polyvinylimidazole with 3-bromopropylamine hydrobromide;
- electronic properties and electrical conductivity of the product.
References
1. Zuhal Küçükyavuz, Savas Küçükyavuz, Nahid Abbasnejad. Electrically conductive polymers frompoly(N-vinylimidazole) // Polymer. -1996. -Vol. 37. -No. 15. -Р. 3215-3218.
2. Murat Özyalçin, Zuhal Küçükyavuz. Synthesis, characterization and electrical properties of iodinated poly(N-vinyl imidazole) // Synthetic Metals. -1997. -Vol. 87. -Р. 123-126.
3. Khaligh, N.G., Poly (N-vinyl imidazole) as a halogen-free and efficient catalyst for N-Boc protection of amines under solvent-free conditions // RSC advances. -2012. -Vol. 2(32). -Р. 12364-12370.
4. S. Tímea, et. al. Nanoconfined crosslinked poly(Ionic liquid)s with unprecedented selective swelling properties obtained by alkylation in nanophase-separated poly(1-vinylimidazole)-l-poly(tetrahydrofuran) conetworks // Polymers. -2020. -Vol. 12. -No. 10. -Р. 1 – 20.
5. Jessica C. Audifred-Aguilar, Victor H. Pino-Ramos, Emilio Bucio. Synthesis and characterization of hydrophilically modified Tecoflex® polyurethane catheters for drug delivery // Materials Today Communications. -2021. -Vol. 26. -Р. 101894.
6. V.V. Apyari et al. Unusual application of common digital devices: Potentialities of Eye-One Pro mini-spectrophotometer – A monitor calibrator for registration of surface plasmon resonance bands of silver and gold nanoparticles in solid matrices // Sensors and Actuators B. -2013. -Vol. 188. -Р. 1109– 1115.
7. S. Katsuhiko, et. al. Electrochemical Quantitative Evaluation of the Surface Charge of a Poly(1-Vinylimidazole) Multilayer Film and Application to Nanopore pH Sensor // Electroanalysis. -2021.- vol. 33; No. 6. -Р. 1633 – 1638.
8. H. Pan, et al. Nitrogen-doped porous carbon with interconnected tubular structure for supercapacitors operating at sub-ambient temperatures // Chemical Engineering Journal. -2020. -Vol. 401. -Р.126083.
9. N. Alexandrina, T., Rodica. Poly(1-vinylimidazole) grafted on magnetic nanoparticles - attainment of novel nanostructures //Revue Roumaine de Chimie.-2020. -Vol. 65; No. 6.-Р. 611 – 616.
10. А. Bakhromova, N. T. Kattaev, Kh. I. Akbarov, O. N. Ruzimuradov. New graphitic carbon nitride synthesis and photocatalytic properties // Uzbek chemical journal.-2022. -Vol. 4. -Р. 9-14. (in Russian)
11. Sidrasulieva G. B., Kattaev N. T., Akbarov Kh. I. Synthesis of nanoscale graphite-like carbon g-O-C3Nx nitride // Universum: Chemistry and Biology. - Moscow. -2021. - No. 12 (90). – S. 84-88. (in Russian)
12. H., Zhou, et. al. Preparation and application of quinine-functionalized poly(1-vinylimidazole) -modified silica stationary phase in hydrophilic interaction chromatography // Chinese journal of chromatography. -2020. -Vol. 38; No. 4. -Р. 438 – 444.
13. A. T. Mamadalimov, N. K. Khakimova, Sh. M. Norbekov. Study of the electrical and photoelectric properties of bamboo fibers // Reports of the Academy of Sciences of the Republic of Uzbekistan. -2022. -No1. -p.26-29. (in Russian)
To cite this article: S. R. Otajonov, N. T. Kattaev, Kh. I. Akbarov, A. T. Mamadalimov. Synthesis and electrochemical properties of an electrically conductive polymer based on polyvinylimidazole // Uzbek chemical journal. -2023. – Nr1. – Pp.9-14.
Received: 01.02.2023; Accepted: 02.03.2023; Published: 20.03.2023
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UDK 541.344
A. F. Ishankulov, A. R. Vokhidov, K. F. Khalilov, Yu. G. Galyametdinov, N. K. Mukhamadiev
INFLUENCE OF SYNTHESIS CONDITIONS ON OPTICAL CHARACTERISTICS OF QUANTUM DOTS CuInS2 AND HYBRIDS CuInS2/ZnS
1Samarkand State University, Samarkand, Uzbekistan, 140104 Samarkand, Universitetsky Bulvar 15, Е-mail: ishankulov-alisher@mail.ru, 2Kazan National Research Technological University, Kazan, Russia. 420015 Kazan. Karl Marx, 68
Abstract. Background. The study of semiconductor nanoparticles is attracting more and more attention, because they have size-dependent optical properties, which facilitates the use of the quantum dots (QDs) they cause.
Purpose: Study of the effect of synthesis conditions and optical characteristics of CuInS2 quantum dots and CuInS2/ZnS hybrids.
Methodology. Absorption spectra of the samples were recorded on a Perkin Elmer Instrumental LAMBDA 35 spectrophotometer, luminescence spectra - on a CaryEclipse (Varian) spectrofluorimeter at a temperature of 25ºC; hydrodynamic size of QDs, by dynamic light scattering, on a MalvernZetasizerNano particle analyzer. Synthesis of QDs was carried out at a temperature of 230°C for 20 min.
Originality. For the first time, the modification of CuInS2/ZnS quantum dots of the “core-shell” type based on thiol-containing stabilizers has been carried out, and the optical-spectral, morphological, and physicochemical parameters of CuInS2/ZnS hybrid quantum dots have been elucidated.
Findings. Absorption, luminescence and fluorescence spectra of QDs and clusters are analyzed, their morphology and size are determined; it was shown that the maximum quantum efficiency of luminescence was achieved for the sample with a synthesis time of 20 min. The optimal number of core and shell components for CuInS2/ZnS hybrid QDs with maximum luminescence has been found.
Key words: quantum dots, copper-indium disulfide, zinc sulfide, luminescence.
Highlights:
- the quantum yield increases from 3.4% to 46.4% (reagent ratio Cu:Zn - 1:2);
- modified CuInS2/ZnS quantum dots of the “core-shell” hybrid system:
- dimensional and optical properties of CuInS2, CuInS2/ZnS quantum dot systems;
- shift of the peak to the short-wavelength region:
- replacement of copper and indium atoms with zinc atoms reduces the size of the luminescent core.
References
1. Scholes G.D. Controlling the optical properties of inorganic nanoparticles //Advanced Functional Materials. – 2008. – Т. 18. – No.8. – P. 1157-1172.
2. Omata T., Nose K., Otsuka-Yao-Matsuo S. Size dependent optical band gap of ternary I-III-VI 2 semiconductor nanocrystals //Journal of Applied Physics. – 2009. – Т. 105. – No. 7. – P. 073106.
3. Aldakov D., Lefrançois A., Reiss P. Ternary and quaternary metal chalcogenide nanocrystals: synthesis, properties and applications //Journal of Materials Chemistry C. – 2013. – Т. 1. – No.24. – P. 3756-3776.
4. Nose K. Soma Y., Omata T.and Otsuka-Yao-Matsuo S. Synthesis of ternary CuInS2 nanocrystals; phase determination by complex ligand species //Chemistry of Materials. – 2009. – Т. 21. – No. 13. – P. 2607-2613.
5. Chang C.C. Chen J.K., Chen C.P., Yang C.H.and Chang J.Y. Synthesis of eco-friendly CuInS2 quantum dot-sensitized solar cells by a combined ex situ/in situ growth approach //ACS applied materials & interfaces. – 2013. – Т. 5. – No. 21. – P. 11296-11306.
6. Zhong H. Zhou Y., Ye M., He Y., Ye J., He C. and Li,Y. Controlled synthesis and optical properties of colloidal ternary chalcogenide CuInS2 nanocrystals //Chemistry of materials. – 2008. – Т. 20. – No. 20. – P. 6434-6443.
7. Chen B. Zhou Q., Li J., Zhang F., Liu R., ZhongH.and Zou B.. Red emissive CuInS2-based nanocrystals: a potential phosphor for warm white light-emitting diodes //Optics express. – 2013. – Т. 21. – No. 8. – P. 10105-10110.
8. Omata T. ani Y., Kobayashi S. and Otsuka-Yao-Matsuo S.. Quantum dot phosphors and their application to inorganic electroluminescence device //Thin Solid Films. – 2012. – Т. 520. – №. 10. – P. 3829-3834.
9. Nanu M., Schoonman J., Goossens A. Nanocomposite three-dimensional solar cells obtained by chemical spray deposition //Nano Letters. – 2005. – Т. 5. – No. 9. – P. 1716-1719.
10. Li L. Daou T.J., Texier I., Kim Chi T.T., Liem N.Q.and ReissP.. Highly luminescent CuInS2/ZnS core/shell nanocrystals: cadmium-free quantum dots for in vivo imaging //Chemistry of Materials. – 2009. – Т. 21. – No. 12. – P. 2422-2429.
11. Sagdeev D.O. Shamilov R.R., Voronkova V.K., Sukhanov A.A. and GalyametdinovYu.G. Studies of the magnetic and optical properties of paramagnetic Cu:CdS quantum dots // Bulletin of the Kazan Technological University. - 2017. - T. 20. - No. 19. - P. 18-20.
12. Ishankulov A.F, Khalilov K.F., Shamilov R.R, GalyametdinovYu.G., Mukhamadiev N.K. 2020 Synthesis and optical-dimensional properties of hybrid CdSe/ZnS nanocrystals // Jour of advresearch in dynamical & control systems. -12(7). -Рp. 2201-2205.
To cite this article: A. F. Ishankulov, A. R. Vokhidov, K. F. Khalilov, Yu. G. Galyametdinov, N. K. Mukhamadiev. Influence of synthesis conditions on optical characteristics of quantum dots CuInS2 and hybrids CuInS2/ZnS // Uzbek chemical journal. -2023. – Nr1. – Pp.14 -19.
Received: 23.02.2023; Accepted: 20.03.2023; Published: 20.03.2023
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INORGANIC CHEMISTRY
UDK 541.49+546.4+546.817
G. A. Abdullayeva, S. S. Murodov, Sh. Sh. Daminova
SYNTHESIS AND STUDY OF ZINC, CADMIUM AND LEAD (II) COMPLEX COMPOUNDS WITH 1,3-BENZOTHIAZOL-2(3H)-THIONE
National University of Uzbekistan named after Mirzo Ulugbek, Tashkent, st. Universitetskaya, 4. Е-mail: abdullayevag615@gmail.com
Abstract. Background. Directed synthesis of substances with certain properties and structure. is impossible without studying the relationship between composition, structure, and properties. The study of the structure and properties of compounds of Zn(II), Cd(II), and Pb(II) ions with the organic ligand 1,3-benzothiazole-2(3h)-thione is topical.
Purpose. Development of a procedure for the synthesis of Zn(II), Cd(II) and Pb(II) complex compounds with 1,3-benzothiazole-2(3H)-thione, study of the composition and structure of the complexes.
Originality. Сomplex compounds of zinc, cadmium and lead (II) c1,3-benzothiazole-2(3H)-thione were synthesized. The dependence of the composition, structure, and properties of complex compounds on the nature of the complexing agent and methods of ligand coordination has been established.
Findings. The electronic structures of the ligand molecules were calculated by the quantum-chemical method using the GAUSSIAN 09 software package, their geometric parameters and energy characteristics were determined, and the most probable centers of localization of the coordination bond were identified based on charge control. The structure of the new compounds, the coordination of the organic ligand, the structure of the coordination site, and the coordination number of the central atom were determined by spectral methods. The thermal properties of the compounds were determined and the products of thermal degradation were identified.
Key words: complex compound, 1,3-benzothiazole-2(3H)-thione, quantum-chemical calculation, composition, structure, properties.
Highlights:
- method of synthesis of complex compounds;
- quantum chemical calculations of 1,3-benzothiazole-2(3H)-thione;
- determination of the composition and methods of coordination of the ligand in the complexes.
References
1. Sunitha M., Kumar D., Divyashree B. R., Geetha S., Shilpa P.V., Kengaiah J.Synthesis, characterization and biological activity of 2,2'-[(6-methylpyrimidine-2, 4-diyl) disulfanediyl] bis (1, 3-benzothiazole) and their Cu (II), Ni (II) complexes //Journal of Advanced Scientific Research. – 2021. – V. 12. – N1 Suppl 1. – P. 197-203.
2. Azam M. A., Suresh B. Biological activities of 2-mercaptobenzothiazole derivatives: a review //Scientia pharmaceutica. – 2012. – V. 80. – N 4. – P. 789-824.doi.org/10.3797/scipharm.1204-27.
3. Kuznetsova A., Domingues P. M., Silva T., Almeida A., Zheludkevich M.L., Tedim J.,CunhaA.Antimicrobial activity of 2 mercaptobenzothiazole released from environmentally friendly nanostructured layered double hydroxides //Journal of Applied Microbiology.–2017.–V.122.–N.5.–P.1207-1218.doi.org/10.1111/jam.13433
4. Bhat R., Kumbhar P., Helavi V. Synthesis, characterization and evaluation of antibacterial and antifungal activity of 2-mercaptobenzothiazole and 2-mercaptobenzoxazole derivatives //Chemistry & Biology Interface. – 2019. – V. 9. – N. 1. -P.38-58.
5. Herrera Cano N. et al. New synthesis and biological evaluation of benzothiazole derivates as antifungal agents //Journal of agricultural and food chemistry. – 2015. – V. 63. – N 14. – P. 3681-3686.doi.org/10.1021/acs.jafc.5b00150
6. Abu-Melha S. Molecular modeling and docking of new 2-acetamidothiazole-based compounds as antioxidant agents //Journal of Saudi Chemical Society. – 2022. – V. 26. – N. 2. – P.101431. doi.org/10.1016/j.jscs.2022.101431
7. Deivedi S. K., Tripathi A. K., Singh V. K. Synthesis and antimicrobial activity of 2-mercaptobenzothiazole derivatives //Pharmacologyonline. – 2010. – V. 2. – P. 30-35.
8. Huang W., Yang G. F. Microwave-assisted one-pot synthesis and fungicidal activity of polyfluorinated 2-benzylthiobenzothiazoles// Bioorganic and Medicinal Chemistry. -2006. -N. 14. -P. 8280-8285.doi.org/10.1016/j.bmc.2006.09.016
9. Sidorova E., Loos D., Bujdakova H., Kallova J. New anticandidous 2-alkylthio-6-aminobenzothiazoles// Molecules. -1997. -N.2. -P. 36-42. doi.org/10.3390/feb97p2.
10. Alam M. N. et al. Synergistic combination of 2-mercaptobenzothiazole (MBT) and nitrosoamine-safe thiuram disulfide as advanced rubber vulcanizing accelerators //Journal of Elastomers & Plastics. – 2022. – V. 54. – N 6. – P. 1061-1077.doi.org/10.1177/00952443221118
11. Lou C., Lou C., Zhu N., Fan R., Hong H., Han L., Zhang J., Suo Q. Highly efficient synthesis of 2-mercaptobenzothiazole derivatives in water: metal sulfide–disulfide dynamic interchange reaction //Green Chemistry. – 2017. – V. 19. – N. 4. – P. 1102-1108.doi.org/10.1002/app.1995.070581205
12. Tietze L.F., Theophil Eicher T., Diederichsen U., Speicher A. Reactions and Syntheses: In the Organic Chemistry Laboratory. Wiley-VCH, 2007. -598 p.
13. Nakamoto K. Infrared and Raman Spectra of Inorganic and Coordination Compounds. Part B. USA, John Wiley & Sons, Inc. Publ., 2009. -403 p
14. Bokker Yu. Spektroskopiya [Spectroscopy]. Moscow, Tekhnosfera Publ., 2009. 528 p.
15. Topor N.D., Ogorodova L.P., Mel'chakova L.V. Termicheskiy analiz mineralov i neorganicheskikh soyedineniy [Thermal analysis of minerals and inorganiс compounds]. -Moscow: MGU Publ., 1987. -190 p
To cite this article: G. A. Abdullayeva, S. S. Murodov, Sh. Sh. Daminova. Synthesis and study of zinc, cadmium and lead (II) complex compounds with 1,3-benzothiazol-2(3h)-thione // Uzbek chemical journal. -2023. – Nr1. – Pp.20 -28.
Received: 01.02.2023; Accepted: 03.03.2023; Published: 20.03.2023
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UDK 546.47:549.751(043.3)
L. A. Sharipova, M. R. Ibragimova, T. A. Azizov
QUANTUM-CHEMICAL AND DIFFERENTIAL THERMAL ANALYSIS OF THE MIXED LIGAND COORDINATION COMPOUND OF ZINC NITRATE WITH FORMAMIDE AND NICOTINAMIDE
1Jizzakh Polytechnic Institute, 2Institute of General and Inorganic Chemistry of the Academy of Sciences of the Republic of Uzbekistan
Abstract. Backround. In the synthesis of complex compounds, the study of metallocomplexes containing ligands with N, O - donor centers is of particular importance. Knowing about them solves the problem of competing coordination in coordination chemistry.
Purpose. Development of optimal synthesis conditions, determination of the structure and composition of the complex compound of zinc nitrate with formamideand nicotinamide. Study of the thermal properties of zinc nitrate complex compound with mixed ligands.
Methodology. Differential thermal analysis, elemental analysis, quantum-chemical calculations.
Originality. For the first time, a new coordination compound of zinc nitrate with formamide and nicotinamide was synthesized. The methods of coordination of ligands and the geometry of the coordination ring in the synthesized complex compound, the formation energy of the complex, the bond length and the distribution of atomic charges were studied based on several options, and the most optimal option was obtained. The thermal properties and thermolysis products of the synthesized complex were studied.
Findings. Molecules of formamide, nicotinamide and a complex compound, on the basis of data on the length of bonds and the distribution of charges on atoms, participate in the formation of a compound, the composition [ZnL1∙L6∙(NO3)2]∙H2O . During its thermolysis, the products were studied in the temperature ranges
Key words: ligand, complex compound, quantum-chemical calculations, bond length, polyhedron, mechanochemical synthesis, thermolysis, endo- and exothermic effects.
Highlights:
- complex compound of zinc nitrate synthesized by mechanochemical method;
- the composition of the synthesized complex compound is proven by the method of elemental analysis;
- coordination center and bond lengths determined by quantum-chemical calculations;
- the thermal properties of the complex compound were studied by the method of derivatographic analysis.
References
1. Jumaniyazova M. E., Khasanov Sh. B. Study of amide complexes of metals // “Modern innovations: chemistry and chemical technology of acetylene compounds. Petrochemistry. Proceedings of the international conference Catalysis. -Tashkent. - November 15-16, 2018 - Pg. 316. (in Russian)
2. Lomovsky O.I. Applied mechanochemistry: pharmaceuticals and medical industry // Processing of dispersed materials and media: int. periodic sat. scientific works. -Issue. 11. - Odessa. -2001. -p.81-100. (in Russian)
3. Sharipova L.A., Azizov T.A., Ibragimova M.R. Coordination compounds of zinc nitrate with carbamide, nitrocarbamide and nicotinic acid // Universum: chemistry and biology. -Moscow. -2018. -No12(54). -p.45-49. URL: http://7uneversum/ru/nature/archive/item/6596 (in Russian)
4. Jumanazarova Z.K. Synthesis, structure and properties of homogeneous and mixed-ligand coordination compounds of magnesium and calcium nitrates: Author's abstract…. Doctor of Philosophy (PhD) in Chemical Sciences. - Tashkent, 2018. - 44 p. (in Russian)
5. Boldyrev V.V. Mechanochemistry and mechanical activation of solids // Uspekhi khimii. -2006. -T.75(3). -p.203-217. (in Russian)
6. Ibragimova M.R. Synthesis and analysis of various amide coordination compounds of a number of metal nicotinates: Author's abstract .... cand. chemical sciences -Tashkent, 2018. -44 p. (in Russian)
7. Charlot G. Methods of analytical chemistry. Quantitative analysis of inorganic compounds. -M.: Publishing house "Chemistry", 1965. -975 p. (in Russian)
8. Bazhenova L.N. Quantitative elemental analysis of organic compounds. - Yekaterinburg: 2008. -356 p. (in Russian)
9. Baranovsky V.I. Quantum chemical calculations of increased accuracy. Tutorial. -2015.- P.280. (in Russian)
10. Gabbott P.(ed.) Principles and Applications of Thermal Analysis. Singapore: Wiley-Blackwell, 2008. - 480 p. (in Russian)
11. Sharipova L.A. Synthesis, structure and properties of coordination compounds of zinc nitrate with homogeneous and mixed ligand ligands: Dis... c.f.f.d. -Bukhara, 2022. -120s. (in Russian)
12. Sharipova L.A., Azizov T.A., Ibragimova M.R. Thermal analysis of the coordination compound of zinc nitrate with nitrogen. Actual problems of modern chemistry// Republican scientific-practical conference. - Bukhara. December 4-5, 2020. – P.46. (in Russian)
To cite this article: L. A. Sharipova, M. R. Ibragimova, T. A. Azizov. Quantum-chemical and differential thermal analysis of the mixed ligand coordination compound of zinc nitrate with formamide and nicotinamide // Uzbek chemical journal. -2023. – Nr1. – Pp.28 -33.
Received: 27.01.2023; Accepted: 27.02.2023; Published: 20.03.2023
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UDK 544:723.212:636.2.033
D. Sh. Shakarova, A. B. Ibragimov
TEMPLATE SYNTHESIS OF NANOSTRUCTURED ZEOLITE A
Institute of General and Inorganic Chemistry of the Academy of Sciences of the Republic of Uzbekistan email: dilshoda.shakarova@mail.ru
Abstract. Background. An urgent problem of natural gas purification is the creation of an adsorbent on a local raw material base, of which interest is attracted by zeolites created using template additives that provide their predetermined functional properties.
Purpose: to study a two-stage approach to the synthesis of nanostructured crystalline type A zeolite with the inclusion of chitosan gel crosslinked with glutaraldehyde as a template in the process, solving the problem of removing the chitosan template from the structure of the resulting zeolite.
Methodology. The use of the hydrothermal method in the sol-gel process of synthesizing nanostructured crystalline zeolite type A. The use of SEM, EMF, X-ray diffraction, nitrogen porosimetry to determine the structural characteristics, the study of CO2 adsorption-desorption on the resulting nanozeolite.
Originality. Nanostructured crystalline type A zeolite was synthesized by a two-stage method. Chitosan crosslinked with glutaraldehyde was used as a template. To remove the chitosan template from the aluminosilicate, the product was treated with hydrogen peroxide.
Findings. Nanostructured crystalline type A zeolite was synthesized, its physicochemical characteristics were studied, incl. no pore shrinkage, crystallinity, CO2 adsorption.
Key words: Colloidal silica gel, sodium aluminate, nanostructured zeolite A, template, chitosan, glutaraldehyde.
Highlights:
- synthesis of type A zeolite in chitosan gel cross-linked with glutaraldehyde, mixed with silica gel;
- chitosan gel plays the role of a space limiter for the formation of the nanozeolite structure;
- chitosan is a pore-forming template.
References
1. Zhdanov S.P., Egorova E.N. Chemistry of zeolites. - Leningrad: Nauka, 1968. - 158 p. (in Russian)
2. Scott M. Auerbach, Kathleen A.Corrado, Prabir K. Dutta. “Handbook of Zeolite Science and Technology”. Ed.2003, ISBN: 0-8247-4020-3.
3. Barrer, R. Hydrothermal chemistry of zeolites [Text] / translated from English. I. V. Mishina; ed. Kh. M. Minacheva. - Moscow: Mir, 1985. - 420 p. (in Russian)
4. Liu X.D., Wang Y.P., Cui X.M., He Y., Mao J. Influence of synthesis parameters on NaA zeolite crystals, Powder Technol.,243, 2013, P.184–193.
5. Kouwenhoven, H. W., & de Kroes, B. (2 Chapter 15 Preparation of zeolite catalysts.// Introduction to Zeolite Science and Practice. -2001. -Рр.673–706.
6. Xiaowen X., Jing W., Yingcai L. Zeolite-based Materials for Gas Sensors.// Sensors. -2006. -12. -P.1751-1764.
7. Kumar S., Rohit S., Joonseok K. Utilization of zeolites as CO2 capturing agents: Advances and future perspectives. // Journal of CO2 Utilization. -2020. -41. -P.10125
8. Yao J., Wang H., Ringer S., Chan K., Zhang L., Xu N. Growth of SAPO-34 in polymer hydrogels through vapor-phase tran sport Microporous and mesoporous materials. -2005, 85, 3. -Рp.267-272
9. Pan Y., Ju M., Yao J., Zhang L. and Xu N. Preparation of uniform nano-sized zeolite A crystals in microstructured reactors using manipulated organic template-free synthesis solutions. //Chem. Commun. -2009. -P.7233–7235.
10. Yu J., Chapter 3 - Synthesis of Zeolites, in: J. Čejka, H. van Bekkum, A. Corma, F. Schüth (Eds.), Studies in Surface Science and Catalysis, Elsevier. -2007. -P. 39–103.
11. Rashidova S.Sh., Shakarova D.Sh, Ruzimuradov O.N., Zalyalieva S.V., Shpigun O.A., Kabulov B.D.. Bionanocompositional chitosan-silica sorbents for liquid chromatography.// J. Chromatography В. -2004. -800. -P.49-54.
12. Valtchev P., Tosheva L., and Bozhilov K., “Synthesis of zeolite nanocrystals at room temperature,” Langmuir. -2005. -23. -P. 10724–10729.
13. Jagiello J., Thomme M.. Comparison of DFT characterization methods based on N2 , Ar, CO2, and H2 adsorption applied to carbons with various pore size distributions. // Carbon. -2004. -P. 1227–1232.
To cite this article: D. Sh. Shakarova, A. B. Ibragimov. Template synthesis of nanostructured zeolite A // Uzbek chemical journal. -2023. – Nr1. – Pp.34 -40.
Received: 02.03.2023; Accepted: 15.03.2023; Published: 20.03.2023
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UDK 541.135
K. Kh. Rashidova, A. A. Minavvarov, N. T. Kattaev, Kh. I. Akbarov
STRUCTURAL FEATURES OF Ni-Co-P BIMETALLIC PHOSPIDE FOR HYDROGEN FUEL GENERATION
National University of Uzbekistan named after Mirzo Ulugbek, E-mail: komila.rashidova@mail.ru
Abstract. Background. To decompose water, electrocatalysts based on expensive Pt, Ir are used. However, there is an alternative - catalysts from compounds of d-elements: Fe, Co, Ni, Cu.
Purpose. Study of structural morphology features of Ni-Co-P bimetallic phosphide.
Methodology. The synthesis of Ni-Co-P was carried out by a one-stage hydrothermal method, in air. The structure of the sample was studied by electron microscopy (SEM), energy-dispersive spectroscopy, and X-ray diffractometry.
Originality. It was revealed that the synthesized Ni-Co-P has a pronounced crystal structure of the compounds Ni2P4O12 (59%), NiP2O7 (37%) and NiCoP (4%).
Findings.The synthesis of Ni-Co-P was carried out. The phase composition, morphology of the surface and crystal structure, the nature of the distribution of elements over the volume of Ni-Co-P bimetallic phosphide were studied by physicochemical methods of analysis.
Key words: hydrothermal synthesis, bimetallic phosphide, structure morphology, phase analysis, electrocatalyst.
Highlights:
- one-stage hydrothermal method for the synthesis of Ni-Co-P;
- phase composition of Ni-Co-P;
- Structural morphology of Ni-Co-P.
References
1. M. G. Walter, E. L. Warren, J. R. McKone, S. W. Boettcher, Q. Mi, E. A. Santori and N. S. Lewis. Solar Water Splitting Cells // Chem. Rev.-2010. -Vol. 110. -Р. 6446-6473.
2. V. N. Nguyen and L. Blum. Electrochemical Generation of Syngas from Water and Carbon Dioxide at Industrially Important Rates // Chem. Ing. Tech.- 2015. -Vol. 87. -Р. 354-375.
3. M. Götz, J. Lefebvre, F. Mörs, A. McDaniel Koch, F. Graf, S. Bajohr, R. Reimert and T. Kolb. Renewable Power-to-Gas: A technological and economic review // Renew. Energ. -2016. -Vol. 85. -Р. 1371-1390.
4. I. C. Man, H. Y. Su, F. Calle-Vallejo, H. A. Hansen, J. I. Martinez, N. G. Inoglu, J. Kitchin, T. F. Jaramillo, J. K. Norskov and J. Rossmeisl. Universality in Oxygen Evolution Electrocatalysis on Oxide Surfaces // Chemcatchem. -2011.- Vol. 3. -Р. 1159-1165.
5. H. Dau, C. Limberg, T. Reier, M. Risch, S. Roggan and P. Strasser. The Mechanism of Water Oxidation: From Electrolysis via Homogeneous to Biological Catalysis // Chemcatchem. -2010. -Vol. 2. -Р. 724-761.
6. C. C. L. McCrory, S. Jung, J. C. Peters and T. F. Jaramillo.Benchmarking Heterogeneous Electrocatalysts for the Oxygen Evolution Reaction // J.Am. Chem. Soc. -2013. -Vol. 135. -Р. 16977-16987.
7. P. Du and R. Eisenberg. Catalysts made of earth-abundant elements (Co, Ni, Fe) for water splitting: Recent progress and future challenges // Energy Environ. Sci. -2012. -Vol. 5. -Р. 6012-6021.
8. W. T. Hong, M. Risch, K. A. Stoerzinger, A. Grimaud, J. Suntivich and Y. Shao-Horn.Toward the rational design of non-precious transition metal oxides for oxygen electrocatalysis // Energy Environ. Sci. -2015. -Vol. 8. -Р. 1404-1427.
9. Qijie Mo, Wenbiao Zhang, LiuqingHeXiang Yu, Qingsheng Gao. Bimetallic Ni2-xCoxP/N-doped carbon nanofibers: Solid-solution-alloy engineering toward efficient hydrogen evolution // Applied Catalysis B: Environmental. -2019. - Vol. 244. -Р. 620-627.
10. Min Li, YunyunLuo, Chen Jia, Qiankun Zhang, GuoxiLuo, et al. Facile Synthesis of Bimetal Nickel Cobalt Phosphate Nanostructures for High-Performance Hybrid Supercapacitors. //Journal of Alloys and Compounds. -2022.- Vol. 893. -Р.162340.
11. V.N. Kuleshov, N.V. Korovin, N.V. Kuleshov, E.Ya. Udris, A.N. Bahin. Development of new electrocatalysts for low-temperature electrolysis of water // Electrochemical Energy. -2012. -T. 12. -No. 2. -P. 51-58. (in Russian)
To cite this article: K. Kh. Rashidova, A. A. Minavvarov, N. T. Kattaev, Kh. I. Akbarov. structural features of Ni-Co-P bimetallic phospide for hydrogen fuel generation // Uzbek chemical journal. -2023. – Nr1. – Pp.34 -40.
Received: 02.03.2023; Accepted: 15.03.2023; Published: 20.03.2023
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UDK 54.064
U. N. Ruziev, S. N. Rasulova, V. P. Guro, U. R. Ernazarov, M. A. Ibragimova, H. F. Adinaev
TECHNOLOGY OF ELECTROCHEMICAL PROCESSING OF WASTE ALLOYS OF TUNGSTEN-RHENIUM AND MOLYBDENUM-RHENIUM
1Institute of General and Inorganic Chemistry of the Academy of Sciences of the Republic of Uzbekistan, 2Scientific and Production Association "Production of rare metals and hard alloys" JSC "Almalyk MMC"
Abstract. Background. Waste from the production of tungsten-rhenium and molybdenum-rhenium alloys is subject to processing, with the regeneration of tungsten, molybdenum and rhenium.
Purpose: development of technology for electrolysis processing of metal wastes of tungsten-rhenium and molybdenum-rhenium alloys.
Methodology. The object of study is the waste metal waste of tungsten-rhenium and molybdenum-rhenium alloys of НПО ПРМиТС Almalyk MMC JSC. Electrochemical measurements were carried out on a PI-50-1 laboratory potentiostat and in an electrolysis unit with a bath with a volume of up to 6 dm3, with an open top, and a direct current source. Elemental analysis of sample samples and electrolyte solutions was carried out on an Agilent 7500 IСP and by the spectral method.
Originality. A technological scheme of an electrochemical method for processing metal wastes of tungsten-rhenium and molybdenum-rhenium alloys has been developed. The optimal conditions for the anodic dissolution of their samples in an electrolyte based on caustic potash have been established.
Findings. Polarization curves of anodic dissolution of molybdenum, tungsten and their alloys with rhenium: MP-47 and VR-20 are obtained. Technological schemes of electrochemical processing of wastes of molybdenum-rhenium and tungsten-rhenium alloys have been developed, which are based on the anodic dissolution of alloys in a solution of caustic potash, accompanied by the release of rhenium in the form of an insoluble precipitate of potassium rhenate and a production tungstate-containing solution.
Key words: metal waste, tungsten-rhenium alloy, molybdenum-rhenium alloy, tungstate ions, potassium rhenate, caustic potash.
Highlights:
- anodic dissolution of tungsten-rhenium alloy waste;
- anodic dissolution of molybdenum-rhenium alloy waste;
- electrolyte based on caustic potash;
- technology of electrolysis processing of metal wastes of alloys with rhenium.
References
1. Zelikman A.N., Nikitina A.S. Tungsten. - Moscow: Metallurgy Publishing House, 1978.- 272. (in Russian)
2. Kim B. Shedd. Tungsten recycling in the United States in 2000, Open-file report 2005-1028, published 2005 online // URL: http://pubs.usgs.gov/of' 2005/1028/index.html
3. Lassner E., Schubert W.D. Tungsten: properties, chemistry, technology of the element, alloys, and chemical compounds. -NY: KluwerAcademic, PlenumPublishers, 1999. -422 p.
4. Pirmatov E. A. Physical and chemical bases and development of technology for the complex processing of tungsten-containing raw materials: Author's abstract .... Doctor of Technical Sciences. - Almaty, 2003. -50 p. https://rusneb.ru/catalog/000200000018 RUNLR bibl 476201. (in Russian)
5. Pechenkina E.N. Oxidative dissolution of molybdenum, tungsten and rhenium during chlorination in an organic medium: Dissertation…. Ph.D. -M., 2005. -98 p. (in Russian)
6. Ganiev, Sh. inorganic chemistry. -1973. -T.18. -N 3.-C.709-711. (in Russian)
7. Ganiev Sh.U., Ismailov N.P., Guro V.P. Anode dissolution of molybdenum and tungsten metal wastes in neutral solutions // Chemistry and Chemical Technology. -Tashkent. -2004. - No. 1-2. - S. 59-61. (in Russian)
8. V.P. Guro, Molybdenum Dissolution in Mixtures of H2O2 and Concentrated HNO3 and H2SO4 in the Presence of Tungsten (2008), Inorganic Materials, Vol. 44, no. 3, pp. 291–295. © PleiadesPublishing, Ltd., 2008. Original Russian Text © DOI: 10.1134/S0020168508030059.
9. Smirnova L. V. High-speed anodic dissolution of tungsten and hard alloys of the VK type in aqueous-organic solutions of sodium chloride: Abstract of .... Ph.D. - Ivanovo, 2000. (in Russian)
10. Kozlova N.B. Electrochemical dissolution of molybdenum, tungsten and alloys based on them in aqueous and aqueous-organic solutions of electrolytes: Diss ... candidate of technical sciences - Ivanovo, 2003.-131 p. (in Russian)
11. Kolenkov V.V., Funtikova E.I., Shapiro K.Ya., Yurkevich Yu.N. Patent SU 233922 A1. Electrochemical method of dissolving metallic tungsten. App. 1078010/22-1, 1966.05.14. Register. 1966.05.14; Published 1968.12.24 (in Russian)
12. Palant A.A., Bryukvin V.A., Levchuk O.M. Patent Ru 2340707. Method for electrochemical processing of metal wastes of tungsten or rhenium. Appl.: 2007-03-20; Published 12/10/2008. (in Russian)
13. Palant A.A., Pavlovsky V.A. Physical-chemical and technological bases of electrochemical processing of metal tungsten wastes. //Technology of metals. -2003. -No. 11. -S.3-7. (in Russian)
14. Pavlovsky V.A., Palant A.A., Reznichenko V.A. Patent SU 1794108 A3. A method for processing waste metal tungsten. App. No. 4936980, publ. 1993-02-07. (in Russian)
15. Levin A.M., Kuznetsova O.G., Sevostyanov M.A. Influence of sodium carbonate on the limiting current of dissolution of tungsten and molybdenum in NaOH solutions.// In Sat. articles of the International n.-pract. Conf. "Concepts of fundamental and applied scientific research" (February 20, 2017, Kazan). At 4 o'clock - Ufa: AETERNA, 2017. - part 4. P.17-19. (in Russian)
16. Kolenkov V.V., Funtikova E.I., Shapiro K.Ya., Yurkevich Yu.N. Patent SU 233922 A1. Electrochemical method of dissolving metallic tungsten. App. 1078010/22-1, 1966.05.14. Register. 1966.05.14; Published 1968.12.24 (in Russian)
17. Berezina S.L., Goryacheva V.N., Dvulichanskaya N.N. Anode behavior of tungsten with different surface structure in alkaline electrolyte. // Successes of modern natural science. -2017.–№4.–С.7-11; URL: https://natural-sciences.ru/ru/article/view?id=36426. (in Russian)
18. A.A. Polant, I.D. Troshkina, A.M. Chekmarev. Metallurgy of rhenium. -M.: Nauka, 2007. - 298 p.
19. D. Dobos. Electrochemical constants: a handbook for electrochemists. Ed. Ya.M. Kolotyrkin. Per. from English. and Hung. V.A. Safonov. -M.: Mir, 1980. -365 p. (in Russian)
20. U.N. Ruziev, S.N. Rasulova, V.P. Guro, M.A. Ibragimova, S.N. Kim, W.R. Ernazarov. Anode dissolution and charge curves of the surface of tungsten in solutions of caustic potash // Universum: chemistry and biology: electron, nauch, zhurn. -2022. -7(97). URL: https://7universum.com/ru/nature/archive/item/l40lI; DOI-10.32743 / Uni Chem.2022.97.7.14011 (in Russian)
To cite this article: U. N. Ruziev, S. N. Rasulova, V. P. Guro, U. R. Ernazarov, M. A. Ibragimova, H. F. Adinaev. Technology of electrochemical processing of waste alloys of tungsten-rhenium and molybdenum-rhenium // Uzbek chemical journal. -2023. – Nr1. – Pp.44 -51.
Received: 16.08.2022; Accepted: 05.10.2022; Published: 20.03.2023
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UDK 691.544.4
F. B. Atabaev, M. I. Iskandarova, A. Sh. Khadzhiev, G. P. Chernysheva, S. K. Yusupov
STUDY OF RAW MATERIALS OF THE ARAL REGION AS ADDITIVES FOR PORTLAND CEMENT
Institute of General and Inorganic Chemistry of the Academy of Sciences of the Republic of Uzbekistan
Abstract. Background. Based on the "green agenda" in the production of cement, reducing the share of clinker in it with the replacement of active mineral additives is relevant.
Purpose. Determining the suitability of inorganic raw materials of Karakalpakstan as cement additives and developing practical recommendations for their use.
Methodology. Chemical and mineralogical compositions of raw materials were studied by chemical, optical, X-ray phase, DTA, IR methods. Their compliance with ƠzDSt 901-98 to mineral additives in cement is established in accordance with GOST 25094, pozzolanic activity - in accordance with GOST 25592-2019.
Originality. The chemical, mineralogical compositions, hydraulic and pozzolanic activity of the sandstone of the Khodjakul deposit and the Karatau-1 porphyrite have been established. Their quality indicators meet the requirements for additives to cements of the PC400-D20 brand.
Findings. The sandstone of the Khodjakul deposit is characterized by high hydraulic and pozzolanic activity. The amount of CaO absorbed from the lime for 30 days is 30.03 mg/l, according to the saturation of the liquid phase with lime 6.84%, the total alkalinity of the solution is 53.6 mekv/l. In the composition of porphyrite, the content of silicon oxide is less than that of sandstone, oxides are higher. It has activity t \u003d 24.47> 2.07, the amount of CaO absorbed from the lime mortar is 24.78 mg / l, according to the saturation of the liquid phase with lime - 6.9%, the total alkalinity of the solution with samples of cement with porphyrite - 56 mekv / l.
Key words: natural raw materials, sandstone, porphyrite, structure, hydraulic activity, pozzolanic capacity, additive.
Highlights:
- sandstone and porphyrite up to 20% replace high-temperature clinker;
- regulation of the process of formation of hydration products;
- reduction in the amount of Ca2+ ions leached from cement into the liquid phase;
- decrease in the number of Ca (OH)2 crystals in the cement stone;
- increase in the content of calcium hydrosilicates and hydrogarnets of the Philippsite type;
- increase in output, cost reduction, improvement of operational properties of Portland cement.
References
1. Riley I. World cement industry and technology: past, present and future / I. Riley, M. Burbidzh, R. Wang // Cement and its application. - 2020. - No. 3 [Electronic resource]. – Access mode – URL: https://jcement.ru/reading/cemchem/mirovaya-tsementnaya-promyshlennost-itekhnologiya-proshloe-nastoyashchee-i-budushchee/. (in Russian)
2. Semenov A.A. Situation on the Russian cement market: development of the production base, prospects, problems // Stroitelnye materialy. -2011. -No. 3. -P. 60-62. (in Russian)
3. Vysotsky E.V. Trend and prospects for the development of the cement market of the Russian Federation // Building materials. -2013. -No. 2. -P. 66-69. (in Russian)
4. Kuhn Konienhall. CEMBUREAU - cement and energy market in Europe and in the world // Cement and its application. -2013. - No. 3. - P. 22-23. (in Russian)
5. Khozin V.G. Carbonate cements of low water demand - a green alternative to the cement industry in Russia / V.G. Khozin, O.V. Khokhryakov, I.R. Sigbatullin, A.R. Gizzatullin, I.Ya. Kharchenko // Building materials. -No. 5. -2014. -P. 76-82. (in Russian)
6. Rikert J. Efficient composite cements - a contribution to the reduction of CO2 emissions. / J. Rickert, K. Müller // Alitinform International Analytical Review. Cement. Concrete. Dry mixes. - 2011. - No. 2(19). - P. 28-49. (in Russian)
7. Balatkhanova E. M. Development of cement composites of increased biostability using components of the Chechen Republic. -Abstract ... Ph.D. – Penza. -2015. -27 p. (in Russian)
8. B.M. Lozovsky*, S.V. Makarenko, A.N. Chubanov, A.A. Laptev. Research on the production of cements of low water demand using carbonate and silica additives // Collection of scientific articles based on the materials of the All-Russian Scientific Conference - NTO-2021. -Krasnoyarsk. -2021. -P. 69-73. (in Russian)
9. Emelyanov D. V., Erofeev V.-T., Balatkhanova E. M., Markov S. V., Golubka A. I. Study of cement composites with the addition of fine particles of river limestone // Natural and technical sciences. - 2014. - No. 9-10. - P. 423-425. (in Russian)
10. Emelyanov D. V., Erofeev V. T., Balatkhanova E. M., Markov S. V., Senyutin A. V. Study of cement composites with the addition of mountain limestone // Natural and technical sciences. . - 2014. - No. 9-10.-P. 426-428. (in Russian)
11. Mechai A. A., Baranovskaya E. I, Popova M. V. Composite Portland cement using mineral additives based on natural raw materials // Proceedings of BSTU. -2022.- Series 2. - No. 2. - P.100–106. (in Russian)
12. Iskandarova Mastura Iskandarovna, Atabaev Farrukh Bakhtiyarovich, Tursunov Zarif Ruzimurodovich, Tursunova Gulsanam Ruzimurodovna, Botirov Burkhon Bobiro'g'li. Regulation Of The Hardening Process And Structure Formation Of Portlandcement By Addition Of Modified Activated Ash Mixture Tpp // Turkish Online Journal of Qualitative Inquiry. -Vol. 12.-No. 10.- 2021. Published: 2021-10-26. -P. 719-726. Scopus Index.Published: Nov 2, 2021. https://www.tojqi.net/index.php/journal/index
13. Iskandarova Mastura Iskandarovna, Atabaev Farrukh Bakhtiyarovich, Kakurina Lyudmila Mikhailovna, Begzhanova Gulrukh Bakhtiyarovna, Yakubzhanova Zukhra Bakhtiyarovna. Evolution of New Formations and Formation of the Composite Structure during High Degree of Filling Portland cement // Design Engineering. -Toronto, Canada.| -2021. -Issue: 8 |- Pages: 3236 – 3246. Scopus Index- Q4, EiCompendex.
14. Iskandarova Mastura Iskandarovna, Mukhiddinov Dilshod Davronovich, Atabaev Farrukh Bakhtiyarovich. Regulation of the Hardening Process and Structure of Formation of Portland Cement by the Addition of Dark Breeds of Uzbekista // Jour of Adv Research in Dynamical & Control Systems. -Vol. 12.-07-Special Issue. -2020. DOI: 10.5373/JARDCS/V12SP7/20202323 ISSN 1943-023X 2054-2060.
15. Iskandarova Mastura, Mukhitdinov Dilshod Davronovich, Begzhanova Gulrukh Bakhtiyarovna, Yakubzhanova Zukhra Bakhtiyarovna, Makhsudova Nozimakhon Zhafarkhanovna. Complex Use Of Microsilica And Active Ash And Slag Mixture Of Thermal Power Plants For The Production Of "Green" Cement Composites // “Journal of Optoelectronics Laser”. Journal of Optoelectronics Laser is a SCOPUS Indexed Q4 Journal. Above manuscript will be published on or before 15th December 2022.
16. Iskandarova M.I, Atabaev F.B., Begzhanova G.B., Yakubzhanova Z.B., Kakurina L.M. and others. Development of technology for obtaining Portland cement with new types of composite additives // The Ist International Conference on Problems and Perspectives of Modern Sience-ICCPMS. -Tahskent, Uzbekistan. -10-11 June 2021. Indexed Scopus & Web of Science -P. 00563-00564.
17. Shermetov Zh. Since the beginning of the year, 7 cement plants have been launched in Uzbekistan. https://uz.sputniknews.ru/20221206/s-nachala-goda-v-uzbekistane-zapustil.... (in Russian)
18. Uzbekistan imported 1.7 million tons of cement in 9 months. Source: https://stat.uz/ru/press-tsentr/novosti-goskomstata/29533-o-zbekistonga-.... (in Russian)
19. V. N. Shvanov, V. T. Frolov, and E. I. Sergeeva, Peschanik. Systematics and classification of sedimentary rocks and their analogues. - St. Petersburg: Nedra, 1998. -P. 52. (in Russian)
20. Sandstone. Composition, color, properties. Application area. URL: https://kamendvor.ru › interesting › articles › peschanik. (in Russian)
To cite this article: F. B. Atabaev, M. I. Iskandarova, A. Sh. Khadzhiev, G. P. Chernysheva, S. K. Yusupov. Study of raw materials of the Aral region as additives for portland cement // Uzbek chemical journal. -2023. – Nr1. – Pp.51 -59.
Received: 09.01.2023; Accepted: 10.02.2023; Published: 20.03.2023
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ORGANIC CHEMISTRY
UDK 547.514.471:547.656:547.022:547.437
1K. ZH. Rezhepov, 2SH. B. Alimbaeva, 1A. D. Matchanov, 1U. ZH. Ishimov, 1,2R. S. Esanov
SYNTHESIS OF NEW SCHIFF BASES 2-HYDROXY-1-NAPHTHALDEHYDE
1A.S.Sadykov Institute of Bioorganic Chemistry, Uzbekistan Academy of Sciences, st.MirzoUlugbeka, 83, Tashkent, 100125 (Republic of Uzbekistan), e-mail: r_k_zh@bk.ru, 2National University of Uzbekistan named after Mirzo Ulugbek, Republic of Uzbekistan, University street, 4, Tashkent,100174 (Republic of Uzbekistan)
Abstract. Background. The synthesis of new Schiff bases of 2-hydroxy-1-naphthaldehyde with a number of primary amines by condensation reaction and the study of their physicochemical parameters are topical.
Purpose. Synthesis of new Schiff bases of 2-hydroxy-1-naphthaldehyde with some aromatic, heterocyclic amines and sulfonamides and study of their structure.
Methodology. The purity level of the new Schiff bases of 2-hydroxy-1-naphthaldehyde was determined using HPLC (Agilent Technologies 1200, USA) and the spectra were obtained using optical spectral methods (UV - on a Shimadzu 12.80 spectrophotometer (Japan), IR - on a Perkin Elmer-10.6 spectrometer .1 (USA)) and mass spectrometry.
Originality. New Schiff bases were synthesized for the first time from 2-hydroxy-1-naphthaldehyde with some aromatic, heterocyclic amines and sulfonamides.
Findings. Some physicochemical parameters of the synthesized substances were determined, the structure of the obtained substances was studied by studying their spectral properties (UV, IR, mass spectrometry).
Key words: 2-hydroxy-1-naphthaldehyde, primary amines, Schiff base, HPLC, UV, IR, mass spectrometry.
Highlights:
- Schiff bases of 2-hydroxy-1-naphthaldehyde were synthesized for the first time;
- synthesis with some aromatic, heterocyclic amines and sulfonamides;
- some physico-chemical parameters and spectral properties have been studied.
References
1. G. Wilkinson, R. D. Gillard and J. A. McCleverty, Eds., Comprehensive Coordination Chemistry // Pergamon. Oxford. 1987. P. 73.
2. Alarco’n S.H., Olivieri A.C., Sanz D., Claramunt R.M., Elguero J. Substituent and solvent effects on the proton transfer equilibrium in anils and azo derivatives of naphthol. Multinuclear NMR study and theoretical calculations // Jour. Mol. Struct. 2004. Pp. 1-9.
3. Iban’ez G.A., Escandar G.M., Olivieri A.C. Proton transfer and coordination properties of aromatic a-hydroxy hydrazones // Jour. Mol. Struct. 2002. Pp. 17-26.
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To cite this article: K. ZH. Rezhepov, SH. B. Alimbaeva, A. D. Matchanov, U. ZH. Ishimov, R. S. Esanov. Synthesis of new schiff bases 2-hydroxy-1-naphthaldehyde // Uzbek chemical journal. -2023. – Nr1. – Pp.60 -66.
Received: 21.12.2022; Accepted: 20.01.2023; Published: 20.03.2023
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ANALYTICAL CHEMISTRY
UDK 543.25:542.92:546.56:669.33
N. Kh. Kutlimurotova, D. Sh. Mirsaidova, L. K. Kozinskaya, N. A. Atakulova
SOLID-PHASE EXTRACTION OF COPPER(II) IONS 4',4''-DI-(3-HYDROXYPENTYNYL)-DIBENZO-18-CROWN-6 WITH ETHER
National University of Uzbekistan, Е-mail: dildoramirsaidova3@mail.ru
Abstract. Background. An alternative to the extraction of copper ions with liquid organic extractants are "dry" ones: crown ethers, cryptands, etc., which do not require the use of solvents, their subsequent removal and regeneration.
Purpose: to develop a new method for the detection and extraction of copper ions using the solid extractant 4´,4´´-di-(3-hydroxypentynyl)-dibenzo-18-crown-6 ether.
Methodology. The distribution coefficient of copper (II) was determined by conductometry and photometry, the structure of the complex was confirmed by IR and Roman spectroscopy.
Originality. A new method for detecting and extracting copper (II) using the solid extractant 4´,4´´-di-(3-hydroxypentynyl)-dibenzo-18-crown-6 ether has been developed.
Findings: the complexation of copper (II) ions with 4´,4´´-di-(3-hydroxypentynyl)-dibenzo-18-crown-6 ether was studied based on the intensity of the vibrational frequencies of ether bonds in the IR and Roman spectra in the region of 1000 -1500 cm-1. The new reagent is used as a solid extractant for extracting microconcentrations of copper (II) from wastewater.
Key words: 4',4''-di-(3-hydroxypentynyl)-dibenzo-18-crown-6 ether; Cu(II) salts; analytical reagent; solid extractant.
Highlights:
- a single-stage solid-phase extraction of copper (II) cations has been developed;
- extraction with a solid extractant 4',4''-di-(3-hydroxypentynyl)-dibenzo-18-crown-6 ether;
- the technique meets the modern requirements of "green chemistry".
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To cite this article: N. Kh. Kutlimurotova, D. Sh. Mirsaidova, L. K. Kozinskaya, N. A. Atakulova. Solid-phase extraction of copper(II) ions 4',4''-di-(3-hydroxypentynyl)-dibenzo-18-crown-6 with ether // Uzbek chemical journal. -2023. – Nr1. – Pp.67 -75.
Received: 21.02.2022; Accepted: 17.03.2023; Published: 20.03.2023
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