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Dechlorination of gamma-hexachlorocyclohexane by zero-valent metallic iron
Wang, ZY; Peng, PA; Huang, WL; pinganp@gig.ac.cn
2009
发表期刊JOURNAL OF HAZARDOUS MATERIALS
ISSN0304-3894
卷号166期号:40577页码:992-997
摘要This study investigated the rates and pathways of gamma-hexachlorocyclohexane (gamma-HCH) dechlorination by granular zero-valent iron under different pH, iron dosage and temperature conditions. It was found that gamma-HCH was rapidly reduced to benzene and chlorobenzene (CB) with benzene as the major product and that the dechlorination likely follows three steps of dichloroelimination to benzene, or two steps of dichloroelinninations and one step of dehydrohalogenation to CB. The calculated pseudo-first-order rate of gamma-HCH degradation was 0.0125 min(-1) at pH 6.73,25 degrees C and 10 g L-1 iron dosage, corresponding to 55.5 min of half-life. It was also found that the rate of gamma-HCH dechlorination increases as a function of reaction temperature and zero-valent iron dosage and decreases as a function of solution pH. The calculated activation energy is 33.5 kJ mol(-1) at pH 6.73, which is much lower than that of dehydrohalogenation facilitated by hydroxyl under basic conditions. The study suggested that zero-valent iron could be used to effectively and efficiently transform gamma-HCH. (C) 2008 Elsevier B.V. All rights reserved.
部门归属[Wang, Zhiyuan; Peng, Ping'an] Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangzhou 510640, Guangdong, Peoples R China; [Wang, Zhiyuan] Chinese Acad Sci, S China Sea Inst Oceanol, CAS Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China; [Huang, Weilin] Rutgers State Univ, Dept Environm Sci, New Brunswick, NJ 08901 USA
关键词Zero-valent Iron Dechlorination Gamma-hch Kinetics
学科领域Engineering, Environmental ; Engineering, Civil ; Environmental Sciences
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收录类别sci
资助项目海洋地质
WOS记录号WOS:000266947000060
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被引频次:38[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/4618
专题中科院边缘海地质重点实验室
通讯作者pinganp@gig.ac.cn
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GB/T 7714
Wang, ZY,Peng, PA,Huang, WL,et al. Dechlorination of gamma-hexachlorocyclohexane by zero-valent metallic iron[J]. JOURNAL OF HAZARDOUS MATERIALS,2009,166(40577):992-997.
APA Wang, ZY,Peng, PA,Huang, WL,&pinganp@gig.ac.cn.(2009).Dechlorination of gamma-hexachlorocyclohexane by zero-valent metallic iron.JOURNAL OF HAZARDOUS MATERIALS,166(40577),992-997.
MLA Wang, ZY,et al."Dechlorination of gamma-hexachlorocyclohexane by zero-valent metallic iron".JOURNAL OF HAZARDOUS MATERIALS 166.40577(2009):992-997.
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