ADSORPTION OF 4-NITROPHENOL AND DYES ON SILVER-DOPED TiO2, TiO2-ZrO2, ZrO2 XEROGELS UNDER UV IRRADIATION

Nanoscale and composite materials containing titanium and zirconium oxides are of the greatest theoretical and practical interest. Their advantages are low cost, availability of production, the choice of source components and matrices of different nature. This work is an immersion in the subject of research at the Peoples' Friendship University of Russia. The research topic is extremely relevant, because silver appears only once in the list of previously used modifiers, and it is possible to study this issue. The production of TiO2 and ZrO2 nanopowders with dopants using gel technology is a simple and well-studied method for the synthesis of photocatalysts, but the effect of powder irradiation on adsorption has not been studied much, especially for irradiation of dry material with its subsequent introduction into an adsorption solution. It is of interest to study the effect on the adsorption of para-nitrophenol (the state of the molecule - anion or molecule), depending on the pH of the environment, on synthesized xerogels of titanium dioxide and zirconium. It is also necessary to conduct a study to understand the effect of silver on the adsorption of various types of dyes. Model dyes of the cationic type (methylene blue) and anionic type (methylorange) can be used to determine the charged surface centers of materials based on TiO2 and ZrO2 that do not contain or contain a dopant component.