Effect of Dispersity and Porous Structure of TiO2 Nanopowders on Photocatalytic Destruction of Azodyes in Aqueous Solutions  

作　　者：Alexander Zhygotsky Elena Rynda Victor Kochkodan Maksim Zagomy Tatyana Lobunets Ludmila Kuzmenko Andrey Ragulya 

机构地区：[1]Department of Physical Chemistry and Technology of Nanostructure Ceramic and Composites, Ivan Nikitovich FrantseviehInstitute for Problems of Materials Science of National Aeademy of Science of Ukraine, Kiev 03142, Ukraine [2]Department of Catalysis and Purification Water, Anton Vladymirovich Dumansky Institute of Colloid and Water Chemistry of National Academy of Science of Ukraine, Kiev 03680, Ukraine

出　　处：《Journal of Chemistry and Chemical Engineering》2013年第10期949-957,共9页化学与化工（英文版）

摘　　要：Photocatalytic activity of TiO2 nanopowders of anatase modification with various particle sizes and specific surface areas has been studied in the process of photocatalytic decolorization of aqueous solutions of methylene blue and direct blue 2C azodyes. By means of scanning electron microscopy and low-temperature N2 adsorption method, it was found that TiO2 nanopowders have the particles size of 5-120 nm with the specific surface area of 15-120 m2·g^-1. The used TiO2 samples are characterized by mesoporous structures with average pore size of 4.3-14.9 nm. The photocatalytic activity of TiO2 was evaluated via decolorization of azodyes solutions. It was shown that the efficiency of decolorization symbatically changes with the dye adsorption value on TiO2 surface and the degree of decolorization rises when the surface area of TiO2 nanopowders increases. It was found that TiO2 photocatalytic activity essentially depends on adsorption interactions between the dye molecules and catalytic active centers on TiO2 surface, and these interactions, in turn, are greatly affected by pH of the solution.

关 键 词：TIO2 surface area photocatalytic decolorization AZODYE adsorption 

分 类 号：TQ134.11[化学工程—无机化工] TQ613.1