Synthesis, characterization, and comparison of solgel TiO2 immobilized photocatalysts

被引：2

作者：

Duca, Clara ^{[1
]}

Imoberdorf, Gustavo E. ^{[1
]}

Mohseni, Madjid ^{[1
]}

机构：

[1] Department of Chemical and Biological Engineering, University of British Columbia, Vancouver

来源：

International Journal of Chemical Reactor Engineering | 2013年 / 11卷 / 02期

关键词：

Immobilized photocatalyst; Micropollutants; Photocatalysis; Solgel; Tio2; Water treatments;

D O I：

10.1515/ijcre-2012-0054

中图分类号：

学科分类号：

摘要：

This study was focused on the synthesis of titania-based photocatalytic coatings with high photocatalytic activity, attrition resistance, and stability. Five different photocatalytic coatings were synthesized using the solgel technique. Three coatings were prepared using aqueous sols of TiO2 nanoparticles with different amounts of titanium tetraisopropoxide and different quantities and types of acids. The other two photocatalysts were composite solgel coatings which were prepared by incorporating commercial Degussa P25 into the TiO2 synthesized through solgel technique. The physical and optical properties of the immobilized photocatalysts were characterized with UVvis spectroscopy, X-ray diffraction, scanning electron microscopy, and light scattering. The photocatalytic activity of each coating was determined using a lab-scale differential photoreactor by measuring the degradation rate of a model micropollutant, the herbicide 2,4-dichlorophenoxyacetic acid (2,4-D). The conversions of 2,4-D obtained with the TiO2 coatings without Degussa P25 were in the order of 723%, whereas the two composite coatings provided conversions in the range of 6669%. In addition, one of the composite coatings showed a more homogeneous morphology and less cracking, and for this reason, it was more durable and showed lower attrition.

引用

页码：633 / 639

页数：6

共 13 条

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