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Insights into effect of chloride ion on the degradation of 4-bromo-2-chlorophenol by sulphate radical-based oxidation process

文献类型： 外文期刊

作者： Fang, Changling 1 ; Zhang, Xuan 1 ; Lou, Xiaoyi 1 ; Shi, Yongfu 1 ; Tang, Yunyu 1 ; Huang, Dongmei 1 ; Liu, Jianshe 2 ; Guo, Yaoguang 3 ;

作者机构： 1.Chinese Acad Fishery Sci, East China Sea Fisheries Res Inst, Key Lab Control Qual & Safety Aquat Prod, Minist Agr, Shanghai, Peoples R China

2.Donghua Univ, Coll Environm Sci & Engn, State Environm Protect Engn Ctr Pollut Treatment, Shanghai, Peoples R China

3.Shanghai Polytechn Univ, Sch Resources & Environm Engn, Shanghai, Peoples R China

关键词： 4-bromo-2-chlorophenol; sulphate radical; chloride; halogenated products; degradation pathway

期刊名称：INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY （ 影响因子：2.731； 五年影响因子：2.534 ）

ISSN： 0306-7319

年卷期：

页码：

收录情况： SCI

摘要： Degradation efficiency of 4-bromo-2-chlorophenol (BCP) containing both chlorine and bromine substituents in Co/PMS process was investigated in the light of a wide range of substrate, oxidant, catalyst concentrations and pH value. The effects of chloride ion (Cl-) on degradation kinetics, total organic carbon (TOC) removal and intermediates formation during BCP depletion in Co/PMS system were studied. The kinetics results demonstrated that the dual effect of Cl- on BCP depletion in Co/PMS system due to different mechanisms involved. High concentrations of Cl- (>5 mM) can significantly promote the degradation of BCP, but did inhibit BCP mineralisation to a certain extent which was closely related to Cl- content. High degradation rates but lower mineralisation rates were found in the laboratory experiments, owing to the fact that BCP was mainly transformed to new halogenated intermediates instead of complete mineralisation. Gas chromatograph-mass spectrometer (GC-MS) data verified that a series of chlorinated by-products were formed during BCP decomposition process involving of the participation of Cl-. The proposed degradation pathways of BCP and its derivatives in presence of Cl- were discussed on the basis of intermediate products including the undesirable halogenated by-products recognised by GC-MS. These results might offer some new perspectives on the transformation fates of BCP by utilising Co/PMS regent.

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