Accelerated TiO2 photocatalytic degradation of Acid Orange 7 under visible light mediated by peroxymonosulfate
文献类型： 外文期刊
作者： Chen, Xiaoyang 1 ; Wang, Weiping 1 ; Xiao, Hua 1 ; Hong, Chunlai 1 ; Zhu, Fengxiang 1 ; Yao, Yanlai 1 ; Xue, Zhiyong 1 ;
作者机构： 1.Zhejiang Acad Agr Sci, Inst Environm Resource & Soil Fertilizer, Hangzhou 310021, Zhejiang, Peoples R China
关键词： Wastewater;Azo dye;Sulfate radicals;Dye sensitization;Photocatalysis;Peroxymonosulfate
期刊名称：CHEMICAL ENGINEERING JOURNAL （ 影响因子：13.273； 五年影响因子：11.529 ）
ISSN： 1385-8947
年卷期： 2012 年 193 卷
页码：
收录情况： SCI
摘要： In this study, a system involving visible light TiO2 photocatalysis (Vis/TiO2) coupled with SO4--based advanced oxidation technologies (AOTs) through the addition of the oxidant peroxymonosulfate (PMS, HSO5-) has been developed to oxidize the target pollutant Acid Orange 7 (AO7) in aqueous solutions. There existed a remarkable synergistic effect in the combined Vis/TiO2/PMS system, and the performance of this combined system was better than that of a system to which persulfate (PS, S2O82-) or hydrogen peroxide (H2O2) was added. The influence of humic acids (HAs) and inorganic anions (H2PO4- and HCO3-) on the degradation rates in the Vis/TiO2/PMS system was also investigated. The obtained results revealed that HAs had a positive effect on the AO7 degradation efficiency in the Vis/TiO2/PMS system. When added to the Vis/TiO2 system, PMS can abrogate the adverse interference of anions in this system, such that the Vis/TiO2/PMS system exhibits much better degradation rates. The primary degradation intermediates of AO7 identified by GC/MS were phthalic acid, 2,4,6-trichlorophenol, coumarin and two chlorinated aromatic compounds (7-chloro-2-naphthalenol and 2,4-dichloro-1-naphthalenol). A possible pathway was proposed based on the analysis of the degradation products. (C) 2012 Elsevier B.V. All rights reserved.
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