Accelerated TiO2 photocatalytic degradation of Acid Orange 7 under visible light mediated by peroxymonosulfate

文献类型： 外文期刊

第一作者： Chen, Xiaoyang

作者： Chen, Xiaoyang;Wang, Weiping;Xiao, Hua;Hong, Chunlai;Zhu, Fengxiang;Yao, Yanlai;Xue, Zhiyong

作者机构：

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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