Enhanced mineralization of 2,4-dichlorophenol by ozone in the presence of trace permanganate: effect of pH
文献类型： 外文期刊
作者： Xiao, Hua 1 ; Xu, Yuxin 1 ; Yu, Man 1 ; Zhang, Qi 1 ;
作者机构： 1.Zhejiang Acad Agr Sci, Inst Environm Resource Soil & Fertilizer, Hangzhou 310021, Peoples R China
关键词： catalytic ozonation;permanganate;pH;mineralization
期刊名称：ENVIRONMENTAL TECHNOLOGY （ 影响因子：3.247； 五年影响因子：2.699 ）
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收录情况： SCI
摘要： Ozonation of 2,4-dichlorophenol (DCP) in the presence of permanganate has been investigated at various levels of pH. Compared with only 40% in single ozonation, by catalytic ozonation the total organic carbon removal efficiency reached almost 95%. It has been shown that the addition of 0.5 mg L~(-1) MnO_4~- (based on manganese content) greatly accelerated the mineralization of DCP when the initial pH was below 8.5. Under these conditions MnO_4~- was reduced to Mn~(2+), which enabled homogeneous catalysis to take place. When the initial pH was above 10.1, the MnO_4~- was reduced to MnO_2, which did not promote mineralization of DCP by ozone under either neutral or alkaline conditions. Under acidic conditions, however, the addition of MnO_2 greatly enhanced DCP mineralization, the mechanism being that MnO_2 was reduced to Mn~(2+) which is a highly effective homogeneous catalyst for ozonation.
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