Significantly enhanced base activation of peroxymonosulfate by polyphosphates: Kinetics and mechanism

文献类型： 外文期刊

第一作者： Lou, Xiaoyi

作者： Lou, Xiaoyi;Xiao, Dongxue;Lou, Xiaoyi;Fang, Changling;Geng, Zhuning;Jin, Yuming;Wang, Zhaohui;Liu, Jianshe;Guo, Yaoguang;Wang, Zhaohui;Guo, Yaoguang

作者机构：

关键词： Peroxymonosulfate activation; Singlet oxygen; Radical quenching; Degradation

期刊名称：CHEMOSPHERE （ 影响因子：7.086； 五年影响因子：6.956 ）

ISSN： 0045-6535

年卷期： 2017 年 173 卷

页码：

收录情况： SCI

摘要： Base activation of peroxydisulfate (PDS) is a common process aiming for water treatment, but requires high doses of PDS and strongly basic solutions. Peroxymonosulfate (PMS), another peroxygen of sulfurate derived from PDS, may also be activated by a less basic solution. However, enhancing the base-PMS reactivity is still challenging. Here it is reported that pyrophosphate (PA) and tripolyphosphate (PB) can efficiently enhance PMS activation under weakly alkaline conditions (pH 9.5) via the formation of superoxide anion radical (O-2(center dot-)) and singlet oxygen (102). The rate constant of Acid Orange 7 (AO7) degradation in PA/PMS system (kpAiPms) was nearly 4.4-15.9 fold higher than that in PMS/base system. (kpmsibase) without any polyphosphates. Increases in PA (or PB) concentration, PMS dose and pH favored the rapid dye degradation. Gas chromatograph-mass spectrometer (GC-MS) data confirmed AO7 and 2,4,6-trichlorophenol (2,4,6-TCP) were decomposed to a series of organic intermediates. The radical quenching and probe oxidation experiments indicate the degradation "of organic compounds in the PA/PMS and PB/PMS processes was not reliant on sulfate radical (SO4) and hydroxyl radical (center dot OH) species but on O-2(center dot-) and O-1(2) reactive species. Comparison experiments show that the polyphosphate/PMS process was much more favorable than PDS/base process. The present work provides a novel way to activate PMS for contaminant removal using industrial polyphosphate wastewaters. (C) 2017 Elsevier Ltd. All rights reserved.

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