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Rapid transformation of 1,2,3,4-TCDD by Pd/Fe catalysts
Wang, ZY; Huang, WL; Peng, PA; Fennell, DE;
Source PublicationCHEMOSPHERE
AbstractThis 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.
Department[Wang, Zhiyuan; Huang, Weilin; Fennell, Donna E.] Rutgers State Univ, Dept Environm Sci, New Brunswick, NJ 08901 USA; [Wang, Zhiyuan] Chinese Acad Sci, S China Sea Inst Oceanog, CAS Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China; [Wang, Zhiyuan; Peng, Ping'an] Chinese Acad Sci, Guangzhou Inst Geochem, Guangzhou 510640, Guangdong, Peoples R China
KeywordPcdd Reductive Dechlorination Pd/fe Catalyst Reaction Kinetics
Subject AreaEnvironmental Sciences
Indexed Bysci
Funding Project海洋地质
WOS IDWOS:000272888200011
Citation statistics
Cited Times:24[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Recommended Citation
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,& 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.
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