CATALYTIC PROPERTIES OF ZINC OXIDE-BASED COMPOSITE MATERIALS
Journal: SCIENTIFIC NOTES OF V.I. VERNADSKY CRIMEAN FEDERAL UNIVERSITY. BIOLOGY. CHEMISTRY
Volume 11 № 1
, 2025
Rubrics: CHEMICAL SCIENCES
Authors:
1.
Crimean Federal University of a name of V.I.Vernadsky
2.
Kazan (Volga) Federal University
3.
Crimean Federal University of a name of V.I.Vernadsky
Type:
Article
Pages:
from 283
to 293
Status:
Published
Received:
01.07.2025
Accepted:
01.07.2025
Published:
01.07.2025
Subject area:
UDC 54
Language:
Russian
Keywords:
adsorption, zinc oxide, doping, photocatalysis
Abstract (English):
The article presents the results of a study comparing the morphology of particles, adsorption capacity, and photocatalytic efficiency of wide-bandgap semiconductors, using chemically pure zinc oxide and its iron(III) ion-modified heterostructures as examples. The material under investigation was obtained through ultrasonic dispersion of chemically pure zinc oxide in a solution of iron(III) salt. The metal oxide, in the form of a crystalline substance, contains a doping level of iron at 0.24 % by weight of the cationic component. The influence of particle size on the adsorption capacity of the material was investigated. The particle size of the initial zinc oxide was determined using sedimentation analysis. The study of photocatalytic activity was conducted based on model systems, where the degradable substance was the azo dye methyl orange, and the photoactive substrate was the ZnO/Fe heterostructured material. The unmodified zinc oxide served as a comparison sample. Natural and artificial radiation sources with various spectral characteristics (λ=365 nm, λ=254 nm) were used for photo-initiating the reaction. Sedimentation analysis of the composite material allowed for the determination of the presence of micro-sized particles (10-6). Additionally, laser diffraction studies showed that the modified ZnO/Fe material has a particle size nearly 18 times smaller than that of the initial ZnO. Prolonged ultrasonic dispersion of the ZnO sample in the iron(III) salt solution led to a reduction in particle size but did not affect its adsorption capacity. ultraviolet-visible spectroscopy revealed that the ZnO/Fe heterostructural material is an active photocatalyst when exposed to light in the range of 250–650 nm, exhibiting the highest photocatalytic activity in the range of 254–380 nm. It was found that the longer the system is exposed to radiation, the more effective the dye degradation process becomes. The maximum degree of photodegradation was achieved after one hour of exposure of the modified metal oxide and methyl orange system to radiation at λ=254 nm, with the parameter value reaching 18 % without accounting for adsorption.
The article presents the results of a study comparing the morphology of particles, adsorption capacity, and photocatalytic efficiency of wide-bandgap semiconductors, using chemically pure zinc oxide and its iron(III) ion-modified heterostructures as examples. The material under investigation was obtained through ultrasonic dispersion of chemically pure zinc oxide in a solution of iron(III) salt. The metal oxide, in the form of a crystalline substance, contains a doping level of iron at 0.24 % by weight of the cationic component. The influence of particle size on the adsorption capacity of the material was investigated. The particle size of the initial zinc oxide was determined using sedimentation analysis. The study of photocatalytic activity was conducted based on model systems, where the degradable substance was the azo dye methyl orange, and the photoactive substrate was the ZnO/Fe heterostructured material. The unmodified zinc oxide served as a comparison sample. Natural and artificial radiation sources with various spectral characteristics (λ=365 nm, λ=254 nm) were used for photo-initiating the reaction. Sedimentation analysis of the composite material allowed for the determination of the presence of micro-sized particles (10-6). Additionally, laser diffraction studies showed that the modified ZnO/Fe material has a particle size nearly 18 times smaller than that of the initial ZnO. Prolonged ultrasonic dispersion of the ZnO sample in the iron(III) salt solution led to a reduction in particle size but did not affect its adsorption capacity. ultraviolet-visible spectroscopy revealed that the ZnO/Fe heterostructural material is an active photocatalyst when exposed to light in the range of 250–650 nm, exhibiting the highest photocatalytic activity in the range of 254–380 nm. It was found that the longer the system is exposed to radiation, the more effective the dye degradation process becomes. The maximum degree of photodegradation was achieved after one hour of exposure of the modified metal oxide and methyl orange system to radiation at λ=254 nm, with the parameter value reaching 18 % without accounting for adsorption.
Keywords:
adsorption, zinc oxide, doping, photocatalysis
adsorption, zinc oxide, doping, photocatalysis
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