Mn(II)-ACTIVATED PERSULFATE FOR OXIDATIVE DEGRADATION OF DDT

文献类型： 外文期刊

第一作者： Wei, Zhiqi

作者： Wei, Zhiqi;Gao, Ting;Liu, Chengshuai;Zhu, Jushu;Chen, Manjia;Liu, Hui;Zhou, Jianmin;Liu, Hui;Wang, Jizeng

作者机构：

关键词： ISCO; Manganese ion; Persulfate activation; Degradation; Organo-chlorine pesticides; pH; Temperature

期刊名称：FRESENIUS ENVIRONMENTAL BULLETIN （ 影响因子：0.489； 五年影响因子：0.479 ）

ISSN： 1018-4619

年卷期： 2018 年 27 卷 7 期

页码：

收录情况： SCI

摘要： The process of in situ chemical oxidation (ISCO) by persulfate (S2O82-) can be accelerated by metal ion activation, so as to more effectively degrade the subsurface pollutants owing to the enhancement of sulfate radicals (SO4.(-)) generation. Mn2+ is a natural soil metal ion usually exists together with organic pollutants in contaminated soils and groundwater. In this study, the oxidative degradation of DDT by Mn2+ activated persulfate at different reaction conditions was systematically studied. The results showed that Mn2+ is a more stable activator for persulfate oxidation than other reported metal ions (e.g. Fe2+ reported in many papers previously). The activation of persulfate by Mn2+ ions gave DDT a long lasting and efficient degradation effect and a high mineralization rate. With fixed DDT and persulfate concentrations, higher Mn2+ concentrations would give DDT higher degradation rates, and higher temperature accelerated DDT degradation with Mn2+ activation. The pH conditions also posed a significant effect on DDT degradation by Mn2+ activated persulfate, and acidic conditions were found to be more favorable for DDT degradation. The results obtained in this study may give a promising indication and new technology with persulfate for in situ remediating soils and groundwater that contaminated by organo-chlorine pesticides.

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