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Rapid dechlorination of 1,2,3,4-TCDD by Ag/Fe bimetallic particles
Wang, Zhiyuan; Huang, Weilin; Peng, Ping'an; Fennell, Donna E.;
AbstractPolychlorinated dibenzo-p-dioxins (PCDDs) are among the most concerned environmental pollutants on the priority list, and their degradation is difficult to achieve. Hence, developing cost-effective technologies for destroying or detoxifying PCDDs are in high demand. This study investigated the reductive dechlorination of 1,2,3,4-TCDD in the presence of bimetallic Ag/Fe catalysts under aqueous solution and mild temperature conditions. It was found that Ag/Fe catalyst can rapidly transform 1,2,3,4-TCDD to less chlorinated PCDDs and the reaction was pseudo-first-order with respect to the reactant concentration. The dechlorination route of 1,2,3,4-TCDD in the Ag/Fe systems was found to be stepwise and the pathway of from 1,2,3,4-TCDD to DD via 1,2,4-TrCDD, 1,2-DCDD and MCDD was the major one. The surface-area-normalized rate constant (k(SA)) corresponding to the silver bulk loading of 0.0060 mol%, 0.0125 mol% and 0.0228 mol% was 0.0155, 0.0399 and 0.0421 L h(-1) m(-2) respectively. Compared to our prior study of reductive dechlorination of 1,2,3,4-TCDD with bimetallic Pd/Fe catalysts as the catalyst, the reactions with bimetallic Ag/Fe particles were faster for TCDD, but much slower for the intermediates of TrCDDs, DCDDs and MCDD. Our results suggest that bimetallic Ag/Fe is a suitable candidate for rapidly reducing highly chlorinated PCDDs to less or non-chlorinated daughter products. (C) 2015 Elsevier B.V. All rights reserved.
Department[Wang, Zhiyuan] Chinese Acad Sci, South China Sea Inst Oceanol, Guangzhou 510301, Guangdong, Peoples R China; [Wang, Zhiyuan; Peng, Ping'an] Chinese Acad Sci, Guangzhou Inst Geochem, Guangzhou 510640, Guangdong, Peoples R China; [Wang, Zhiyuan; Huang, Weilin; Fennell, Donna E.] Rutgers State Univ, Dept Environm Sci, New Brunswick, NJ 08901 USA ; LTO
KeywordPcdd Dechlorination Bimetallic Ag/fe Reaction Kinetics
Subject AreaEngineering
Document Type期刊论文
Recommended Citation
GB/T 7714
Wang, Zhiyuan,Huang, Weilin,Peng, Ping'an,et al. Rapid dechlorination of 1,2,3,4-TCDD by Ag/Fe bimetallic particles[J]. CHEMICAL ENGINEERING JOURNAL,2015,273:465-471.
APA Wang, Zhiyuan,Huang, Weilin,Peng, Ping'an,Fennell, Donna E.,& dechlorination of 1,2,3,4-TCDD by Ag/Fe bimetallic particles.CHEMICAL ENGINEERING JOURNAL,273,465-471.
MLA Wang, Zhiyuan,et al."Rapid dechlorination of 1,2,3,4-TCDD by Ag/Fe bimetallic particles".CHEMICAL ENGINEERING JOURNAL 273(2015):465-471.
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