Activation of peroxymonosulfate by base: Implications for the degradation of organic pollutants
Activation of peroxymonosulfate by base: Implications for the degradation of organic pollutants
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DOI：
10.1016/j.chemosphere.2016.02.089
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发表时间：
2016-05-01
期刊：
影响因子：
8.8
通讯作者：
Zhang, Huijuan
中科院分区：
文献类型：
--
作者：
Qi, Chengdu;Liu, Xitao;Zhang, Huijuan
环境友好的过一硫酸盐（PMS）活化方法在高级氧化工艺（AOPs）去除有机污染物中的应用日益受到关注。这项工作表明，碱可以作为一种新的激活剂的PMS。在环境温度下，基础/PMS系统能够降解各种有机污染物，包括酸性橙子7（AO 7），苯酚和双酚A。在随后的AO 7实验中，AO 7的脱色速率遵循伪一级动力学，速率常数值范围为0.0006至0.1749 min（-1），取决于操作参数（初始PMS、碱、AO 7浓度和反应温度）。此外，通过自由基清除剂（叔丁醇，甲醇，叠氮化钠和对苯醌）和电子自旋共振捕获研究阐明了碱激活PMS的机制。结果表明，超氧阴离子自由基和单线态氧是Base/PMS体系中主要的活性氧物种，而硫酸根自由基则是主要的活性氧物种。本研究结果为PMS的活化提供了新的途径，并为废水的处理提供了有用的信息。(C)2016爱思唯尔有限公司版权所有
Increasing attention has been paid to environmentally friendly activation methods of peroxymonosulfate (PMS) in advanced oxidation processes (AOPs) for organic pollutant elimination. This work demonstrates that Base can be applied as a novel activator for PMS. The Base/PMS system, at ambient temperature, was able to degrade a variety of organic pollutants, including acid orange 7 (AO7), phenol and bisphenol A. In subsequent experiments with AO7, the decolorization rates for AO7 followed pseudo-first-order kinetics, with rate constant values ranging from 0.0006 to 0.1749 min(-1) depending on the operating parameters (initial PMS, Base, AO7 concentrations and reaction temperature). Furthermore, the mechanism for PMS activation by the Base was elucidated by radical scavenger (tert-butyl alcohol, methanol, sodium azide and p-benzoquinone) and electron spin resonance trapping studies. The results revealed that superoxide anion radical and singlet oxygen other than sulfate radical were the primary reactive oxygen species in the Base/PMS system. The findings of this study present a new pathway for PMS activation and provide useful information for the treatment of wastewater. (C) 2016 Elsevier Ltd. All rights reserved.