Nurali Muhamadiev is a Professor of Physical and Colloid Chemistry and Head of the Department of Physical and Colloid Chemistry. He holds a DSc. degree in Physical Chemistry and has over forty years of experience in academic research and higher education.
His scientific interests encompass chromatographic modeling and optimization, synthesis of sorbents and catalysts, nanomaterials, quantum dots, and physicochemical analysis, with applications in environmental monitoring, industrial processes, and analytical chemistry. His work combines experimental investigation with mathematical and thermodynamic modeling to advance separation technologies and functional materials.
Professor Muhamadiev has published more than 150 peer-reviewed articles, along with monographs and textbooks, and is the inventor or co-inventor of several patented technologies.
In parallel, he is actively engaged in mentorship, academic leadership and supervising postgraduate researchers.
EDUCATION
• DSc. (Physical Chemistry) – Physicochemical Basis of Optimization and Identification in Chromatography.
Samarkand State University, 2007–2013
• PhD (Analytical Chemistry) – Development of regression models of Retention parameters in Gas chromatography.
Samarkand State University, 1982–1987
• Eq. MSc. (Integrated Degree) Chemist / Teacher of Chemistry, Samarkand State University, Sep 1971 – Jun 1976
RESEARCH, TEACHING, or OTHER INTERESTS
Colloid and Surface Chemistry, Physical and Theoretical Chemistry, Analytical Chemistry, Catalysis
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Scopus Publications
Scopus Publications
Thiol-modified CdS quantum dots: synthesis and photocatalytic properties A. M. Zufarov, D. O. Sagdeev, N. K. Mukhamadiev, Yu. G. Galyametdinov Proceedings of SPIE the International Society for Optical Engineering, 2025 Photocatalysts based on CdS and CdS hybrid quantum dots modified with anionic stabilizers containing a hydroxyl group were synthesized. The optical and photocatalytic properties of CdS quantum dots were studied depending on the type of influencing factors such as stabilizer concentration, solution medium, time, and temperature used during the synthesis process. The effects of various factors on the properties of the photocatalysts, such as the type and concentration of the stabilizer, reagent concentrations, synthesis temperature, reaction time, pH value, and solvent type, were investigated. The effect of the stabilizer type on the band gap absorption peak and luminescence band was demonstrated. The average hydrodynamic size of CdS quantum dots stabilized with anionic stabilizers containing hydrophilic groups, chemical composition based on elemental analysis, functional groups using infrared spectroscopy, and rate constants of the photocatalytic reaction were calculated. The photocatalytic processes were carried out at 27 °C using sunlight. The reaction rate constants were determined, and the dehydration degrees of the photocatalyst were calculated. Quantum chemical calculations were performed. The obtained results were thoroughly characterized using spectrophotometric, spectrofluorimetric, X-ray diffraction (XRD), energy dispersive spectroscopy (EDS), dynamic light scattering (DLS), infrared spectroscopy (IR), and transmission electron microscopy (TEM) methods. The effects of quantum dot size, temperature, pH, recombination rate, as well as the coagulation and precipitation properties of nanoparticles on the reaction rate in photocatalytic processes were evaluated using spectrophotometric methods.
Reagent activation of activated carbon obtained from wreck walnut shells and textural characteristics Dilsuz Ergashova, Abdukodir Mukhamadiev, Nurali Mukhamadiev, Shukhrat Sayitkulov, Asatullo Radzhabov Proceedings of SPIE the International Society for Optical Engineering, 2025 The paper studies the textural and sorption characteristics of activated carbon obtained from walnut shells after acid and alkaline activation. Acid activation was carried out using phosphoric and sulfuric acids, and alkaline activation was carried out using potassium hydroxide. It has been established that alkaline activation increases the surface area to 1200 m<sup>2</sup>/g and the pore volume to 0.90 cm<sup>3</sup>/g, which makes this method preferable for the adsorption of organic pollutants. Acid activation, reaching a surface area of 850 m<sup>2</sup>/g, promotes the introduction of oxygen-containing functional groups, which increases the selectivity of coal to heavy metals. The obtained results confirm the high potential of using walnut shells as raw materials for the production of effective sorbents suitable for use in environmental and industrial processes.
Quantum chemical investigation of the photocatalytic activity of TiO2nanoclusters with different structures Javlon Uzokov, Sevara Mamaziyayeva, Abduqodir Muxamadiev, Ilyos Ruziyev, Nurali Mukhamadiev Proceedings of SPIE the International Society for Optical Engineering, 2025 The structural, electronic and photocatalytic activity of (TiO<sub>2</sub>)n (n =5;10;15;20) nanoclusters were studied by quantum chemical methods. According to the calculation results, the band gap in the n=5 cluster was calculated to be 4 eV and its wavelength was calculated to be 310 nm. The band gap energies in the n=10; 15; 20 clusters were calculated to be 3.61; 3.20; 2.90, respectively, and their wavelengths were calculated to be 344; 388 and 427 nm, respectively. Also, the values of the standard Gibbs energy (ΔG) and enthalpy (ΔH) become negative with increasing number of units, which indicates that the formation of large clusters is thermodynamically favorable. For example, the Gibbs free energy for (TiO<sub>2</sub>)<sub>5</sub> was found to decrease from -560.24 kcal/mol to -2250.95 kcal/mol for (TiO<sub>2</sub>)<sub>20</sub>. The entropy (S) and heat capacity at constant storage (𝐶𝑝) showed a systematic increase with cluster size, additional dispersity, and Gibbs tendency. The heat capacity increased from -567.49 to -2364.82 kcal/mol, and the entropy capacity increased from 80.56 to 265.76 kcal/mol. The rotational and configurational degrees of freedom were found to be improved.
Synthesis and study of quercetin complex with Fe(III) ions by spectral methods Shakhnoza Ergashova, Nurali Mukhamadiev, Shukhrat Sayitkulov, Ismoil Ergashev, Asatullo Radjabiv, Abduqodir Muxamadiev Proceedings of SPIE the International Society for Optical Engineering, 2025 This study presents the synthesis and study of a complex of quercetin with Fe(III) ions. UV and IR spectroscopy methods confirmed the formation of a coordination compound in which quercetin interacts with iron ions through hydroxyl and carbonyl groups. Calculations of the instability constant showed high stability of the complex (K<sub>inst.</sub> = 2.2456×10<sup>−4</sup>). It was found that the maximum degree of complexation is achieved with an excess of ligand. The results demonstrate the prospects for using the complex in medicine, catalysis and the creation of sensor materials.
Elemental composition, spectral characteristics, and quantum chemical insights into SRTIO3perovoskite Madina Hayitova, Mokhidil Baxranova, Javlon Uzokov, Abduqodir Muxamadiev, Nurali Mukhamadiev, Feruz Khakimov Proceedings of SPIE the International Society for Optical Engineering, 2025 The sol-gel synthesized SrTiO<sub>3</sub> perovskite was investigated by EDS analysis, which confirmed that its chemical composition was in good agreement with the initial precursors, both qualitatively and quantitatively. UV-Vis absorption spectra revealed a sharp decrease in light intensity in the 250÷300 nm region, while the absorption in the visible range remained relatively weak. This optical behavior suggests that the material is well suited for photocatalytic applications and optoelectronic devices operating in the ultraviolet region. Furthermore, the structural and electronic properties studied by DFT calculations at the B3LYP/6-31G** (d, p) level showed a band gap energy of approximately 3.2 eV corresponding to a wavelength of 387 nm, confirming its semiconducting nature. Thermodynamic analysis by DFT showed that the Gibbs free energy of formation (-379.6 kcal mol<sup>-1</sup>) reflects the high stability of SrTiO<sub>3</sub> and its spontaneous formation from elemental components under ambient conditions. The relatively low standard molar entropy indicates limited configurational freedom, consistent with the ordered crystalline nature of this perovskite oxide.
Quantum chemical study of the photocatalytically active Mo-quercetin complex Javlon Uzokov, Sobir Kosimov, Abduqodir Muxamadiev, Aziz Voxidov, Nurali Mukhamadiev, Tohir Anvarov Proceedings of SPIE the International Society for Optical Engineering, 2025 The electronic and structural nature of the photocatalytically active Mo-quercetin complex was investigated using quantum chemical methods. According to DFT calculations performed at the B3LYP/6-31G(d,p) level, the HOMO energy of the complex was found to be –5.81 eV, while the LUMO energy was –3.28 eV. The corresponding band gap was determined to be approximately 464 nm. Additionally, the reactive character of the molecule can be revealed by the electrostatic potential surface area analysis. It was estimated that 42% of the complex's surface area had ESP values less than -25 kcal/mol. This suggests that there are many nucleophilic areas available for interactions like conjugation with biomolecules, coordination with other metal centers, and hydrogen bonding. On the other hand, it was discovered that about 18% of the surface area exceeded +20 kcal/mol. These results indicate that the complex exhibits semiconducting behavior and can be effectively used as a photocatalyst in the visible light region. Moreover, under standard conditions, the Gibbs free energy (ΔG°) of the complex was calculated to be –75.7 kJ/mol, and the standard enthalpy change (ΔH°) was –114.2 kJ/mol, reflecting an exothermic interaction between the molybdenum center and the quercetin ligand. The standard entropy change (ΔS°) was found to be –105.4 J/mol·K, indicating a decrease in disorder upon complex formation. These thermodynamic parameters confirm that the Mo-quercetin complex is thermodynamically stable. Structurally, the stability of the complex was further assessed based on its intermolecular interaction energies.
Quantum chemical study of the photocatalytic activity Fe3O4/SiO2-trimesic acid-melamine supramolecular system Javlon Uzokov, Gulzoda Fayziyeva, Nurali Mukhamadiev, Ilyos Ruziyev, Nafosat Kuliboyeva, Khurshid Saidov Proceedings of SPIE the International Society for Optical Engineering, 2025 Quantum chemical calculations were performed to study the structural and electronic properties of the Fe<sub>3</sub>O<sub>4</sub>/SiO<sub>2</sub>-trimesic acid-melamine complex with photocatalytic activity. The surface characteristics of the complex were evaluated using the 3D Hirshfeld topographic map and the non-covalent interactions in it using the two-dimensional Hirschfeld fingerprint plot. According to it, it was calculated that the non-covalent interactions that increase the stability of the supramolecular system on the surface are H....O interactions, which account for 53,6%, and N....H interactions, which account for 39,3%. The energies of the HOMO and LUMO molecular orbitals of the Fe<sub>3</sub>O<sub>4</sub>/SiO<sub>2</sub>-trimesic acid-melamine supramolecular system were calculated. According to the calculation results, it was found that the HUMO orbital energy of the complex is <i>E</i> = -5,86 eV, and the LUMO orbital energy is <i>E</i> = -3,13 eV. Also, according to the calculation results based on the B3LYP/DZVP2 hybrid basis set in the TD-DFT method, the band gap energy of the complex was found to be Δ<i>E</i> = 2,73 eV. This indicates that it exhibits effective photocatalytic activity in the visible light region.
Synthesis of complexes from metal cations and 1,3,5-tris-(betta oxoethyl) hexahydroxo-s-triazine and evaluation of their photocatalytic properties Guzal Khodjayorova, Javlon Uzokov, Nurali Mukhamadiev, Raxima Tashmatova, Abduqodir Mukhamadiev, Asatullo Radjabov Proceedings of SPIE the International Society for Optical Engineering, 2025 This study describes the synthesis of coordination complexes based on Zn<sup>2+</sup> and Cd<sup>2+</sup> metal cations using 1,3,5-tris(β-hydroxyethyl)hexahydro-s-triazine as an organic ligand. The obtained compounds were characterized by IR spectroscopy, which revealed characteristic absorption bands corresponding to C=N stretching vibrations in the triazine ring, as well as peaks at 689.08 cm<sup>-1</sup> and 624.53 cm<sup>-1</sup> associated with Zn–O and Zn–N stretching vibrations, respectively. X-ray microanalysis confirmed that the elemental composition of the complexes corresponded to that of the starting reagents. Energy-dispersive X-ray spectroscopy (EDS) revealed distinct Zn-Kα and high-energy Zn-Kβ peaks around 8.6 keV, indicating the presence of metallic zinc. Quantum chemical calculations showed that the HOMO energy level of the Zn complex is –1.905 eV, the LUMO level is 5.707 eV, and the energy gap (ΔE) is 3.802 eV. The photocatalytic activity of the Zn–1,3,5-tris(β-hydroxyethyl)hexahydro-s-triazine complex was evaluated by studying the photodegradation of methylene blue dye in wastewater under UV light irradiation. The results demonstrated that 76.14% of the dye was decomposed within 15 minutes, indicating a high photocatalytic efficiency of the synthesized complex.
Study of photocatalytic activity of ZnO synthesised by various methods Khilola Usmanova, Nigina Fazlieva, Abduqodir Muxamadiev, Javlon Uzokov, Nurali Mukhamadiev, Nigora Rustamova Proceedings of SPIE the International Society for Optical Engineering, 2025 The document reveals the findings of the synthesis of nanostructured zinc oxide (ZnO) by various methods, including salt-gel, hydrothermal and “green” synthesis. The structure, morphology and optical properties of the minerals acquired, along with their capacity to catalyze reactions in the decomposition of organic contaminants, including methyl orange and methylene blue, are studied. It is shown that hydrothermal and “green” synthesis methods provide high surface area and steady activity ZnO nanostructures. Doping ZnO with nitrogen and carbon improved the spectral sensitivity of the material, allowing efficient decomposition of pollutants under the influence of sunlight. It can be seen that the highest decomposition rate measured with ZnO photocatalyst is rhodium B (<i>k</i> = 0.0279 min<sup>-1</sup>). Among the dyes, the decomposition rate index is the lowest for methyl yellow, as its decomposition rate constant was found to be <i>k</i> = 0.0144 min<sup>-1</sup>. The band gap energy of the zinc oxide nanocluster The calculation was performed utilizing the B3LYP (Lee-Yang-Parr) hybrid functional basis set in conjunction with the LANL2DZ basis set the electronic nature of the density functional theory (TD-DFT). It is known that the <sub>EHUMO-ELUMO</sub>, or the energy disparity in between HUMO and LUMO, offers band gap energy between them. For example, the energy of the valence band 194th frontier orbital (HUMO) in the (ZnO)<sub>10</sub> cluster was found to be E<sub>HUMO</sub> = -0.30389 Hatry energy units, and the energy of the conduction band 195 th frontier orbital (LUMO) was found to be E<sub>LUMO</sub> = -0.12819 Hatry energy units.
