Kinetics of oxidative decolorization and mineralization of Acid Orange 7 by dark and photoassisted Co2+ -catalyzed peroxymono sulfate system

被引：140

作者：

Chen, Xiaoyang ^{[1
]}

Qiao, Xianliang ^{[1
]}

Wang, Degao ^{[1
]}

Lin, Jing ^{[1
]}

Chen, Jingwen ^{[1
]}

机构：

[1] Dalian Univ Technol, Dept Environm Sci & Technol, Dalian 116024, Liaoning Prov, Peoples R China

来源：

CHEMOSPHERE | 2007年 / 67卷 / 04期

关键词：

AO7; advanced oxidation technology; sulfate radical; kinetics; peroxymonosulfate;

D O I：

10.1016/j.chemosphere.2006.10.032

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

A kinetic model was proposed and used to interpret the experimental data for degradation of Acid Orange 7 (AO7) in aqueous solution induced by Co2+/peroxymonosulfate (Co/PMS) reagent in terms of both decolorization and mineralization. The pseudo first-order decolorization rate constants are related to [Co2+], [PMS], reciprocal of [H+] and [AO7](0). Activation energy of the AO7 decolorization process was determined to be 75.7 kJ mol(-1). UV and visible light can accelerate the decolorization and mineralization process due to different mechanisms. In the combined UV/Co/PMS system, UV light can decompose PMS to generate hydroxyl ((OH)-O-center dot) and sulfate radicals (SO4 center dot-), while in the Vis/Co/PMS system, excited AO7 molecules can transfer electrons to PMS or Co3+ and thus accelerate the decomposition of PMS and catalytic cycle of Co3+/Co2+. (c) 2006 Elsevier Ltd. All rights reserved.

引用

页码：802 / 808

页数：7

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