PROSPECTS FOR THE APPLICATION OF ZINC OXIDE SYNTHESIZED BY HYDROTHERMAL METHOD
DOI:
https://doi.org/10.20535/2218-930012026363882Keywords:
metal oxide, nanostructured oxides, photocatalysis, self-cleaning coatings, water treatmentAbstract
Nanostructured oxides with photocatalytic properties are promising materials for use in such directions as water treatment from organic pollutants and production of self-cleaning coatings. Purification is carried out due to the gradual degradation of organic pollutants under the action of radicals formed on the surface of the photocatalyst. Zinc oxide is one of the effective photocatalytic materials. The article investigates the effect of synthesis conditions on the properties of zinc oxide. Zinc hydroxide was precipitated from a zinc acetate solution by a sodium hydroxide solution. In order to reduce the size of the crystallites, before precipitation the zinc acetate solution was mixed with a guar gum solution. The resulting suspension was heat-treated in a sealed container without air access at a temperature of 110 °C. After that, the material was filtered, washed and heated at temperatures of 150 °C and 500 °C. The composition of the samples was studied by X-ray diffraction. It was found that the use of the hydrothermal method with heat treatment at a temperature of 150 °C allows obtaining a mixture of hexagonal crystalline modification of zinc oxide, cubic crystalline modification of zinc oxide and smithsonite. After heating at a temperature of 500 °C, only hexagonal modification of zinc oxide was obtained. The photocatalytic efficiency was investigated using solutions of congo red and crystal violet. It was determined that the presence of cubic modification of zinc oxide in the material increases the efficiency of the photocatalyst. This makes the material a promising photocatalyst both in the context of water treatment and in applying of self-cleaning coatings.
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