Rapid transformation of 1,2,3,4-TCDD by Pd/Fe catalysts

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	Rapid transformation of 1,2,3,4-TCDD by Pd/Fe catalysts
	Wang, ZY ; Huang, WL ; Peng, PA ; Fennell, DE
刊名	CHEMOSPHERE
	2010
卷号	78 期号:2 页码:147-151
关键词	PCDD Reductive dechlorination Pd/Fe catalyst Reaction kinetics
ISSN号	0045-6535
通讯作者	whuang@envsci.rutgers.edu
中文摘要	This study investigated reductive dechlorination of 1,2,3,4-tetrachlorodibenzo-p-dioxin (1,2,3,4-TCDD) in the presence of Pd/Fe, Cu/Fe and Ni/Fe bimetallic catalysts or zero-valent iron (ZVI) under aqueous and ambient temperature conditions. It was found that the Pd/Fe catalyst can rapidly transform 1,2,3,4-TCDD to chlorine-free dibenzo-p-dioxin (DD) with >95% of conversion and half lives on the order of 5 h, whereas Cu/Fe, Ni/Fe and ZVI were not reactive over 10 d. The dechlorination of 1,2,3,4-TCDD in the Pd/Fe systems was found to be stepwise, with 1,2,3-tri (TrCDD), 1,2-di (DCDD), and mono-(MCDD) chlorodibenzo-p-dioxins as the three intermediate products at low concentrations and DD as the final and dominant product. The reaction rate of 1,2,3,4-TCDD dechlorination appeared to decrease as the coverage of palladium on iron particle surface increases from 0.0060 mol% to 0.0228 mol%. Compared to our prior study of reductive dechlorination of 1,2,3,4-TCDD with zero valent zinc (ZVZ) as the reductant, the reactions with Pd/Fe bimetallic materials were relatively slower for TCDD, but much faster for TrCDDs and DCDDs, yielding DID as the major product. The study suggested that Pd/Fe bimetallic catalyst-based reactions may be suitable for rapid decontamination of polychlorinated dibenzo-p-dioxin/dibenzofuran (PCDD/F) polluted soils and sediments. (C) 2009 Elsevier Ltd. All rights reserved.
学科主题	Environmental Sciences
收录类别	SCI
原文出处	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000272888200011
公开日期	2011-07-03
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/4352]
专题	南海海洋研究所_中科院边缘海地质重点实验室
推荐引用方式 GB/T 7714	Wang, ZY,Huang, WL,Peng, PA,et al. Rapid transformation of 1,2,3,4-TCDD by Pd/Fe catalysts[J]. CHEMOSPHERE,2010,78(2):147-151.
APA	Wang, ZY,Huang, WL,Peng, PA,&Fennell, DE.(2010).Rapid transformation of 1,2,3,4-TCDD by Pd/Fe catalysts.CHEMOSPHERE,78(2),147-151.
MLA	Wang, ZY,et al."Rapid transformation of 1,2,3,4-TCDD by Pd/Fe catalysts".CHEMOSPHERE 78.2(2010):147-151.