Photocatalytic oxidation of toxic organohalides with TiO2/UV:: The effects of humic substances and organic mixtures

被引：88

作者：

Lin, Chitsan

Lin, Kuen-Song

机构：

[1] Natl Kaohsiung Marine Univ, Dept Marine Environm Engn, Kaohsiung 811, Taiwan

[2] Yuan Ze Univ, Fuel Cell Ctr, Dept Chem Engn & Mat Sci, Chungli 320, Taiwan

来源：

CHEMOSPHERE | 2007年 / 66卷 / 10期

关键词：

DDT; 1,2,3-trichlorobenzene; 4-chlorophenol; humic acid retardation; reaction substrates competition effects;

D O I：

10.1016/j.chemosphere.2006.08.027

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

TiO2/UV photocatalytic oxidation of DDT (1,1,1-trichloro-2,2-bis(p-chlorophenyl)ethane), 1,2,3-trichlorobenzene and 4-chlorophenol were examined in aqueous solution in the presence of humic substances and organic mixtures to study if the degradation rates were affected. Both commercial and natural humic substances were observed to retard the photodegradation rates, with a greater effect from the natural humic substances. Acetonitrile and isopropanol also caused significant retardation of 4-chlorophenol photodegradation. The overall retardation can be attributed to the combination of light attenuation, inhibition and competition effects. Moreover, the TiO2/UV system favors the decomposition of compounds that have stronger adsorption onto the TiO2 surface. To engineer effective treatment facilities that use the TiO2/UV system for the treatment of toxic substances in wastewater, the methodology must allow for concerns about adventitious species which are present. (c) 2006 Elsevier Ltd. All rights reserved.

引用

页码：1872 / 1877

页数：6

共 39 条

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