Adsorption and destruction of PCDD/Fs using surface-functionalized activated carbons

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Title:	Adsorption and destruction of PCDD/Fs using surface-functionalized activated carbons
Authors:	張木彬;Atkinson, J.D.;Hung, P.C.;Zhang, Z.;Chang, M.B.;Yan, Z.;Rood, M.J.
Contributors:	工學院環境工程研究所
Keywords:	Activated carbon;adsorbents;Adsorption;Air Pollutants - chemistry;Air Pollution - prevention & control;Benzofurans - chemistry;bromine;Carbon;Charcoal - chemistry;chlorine;dechlorination;Destruction;Filtration;free radicals;hazardous waste;Hazardous Waste - analysis;Hydrogen - chemistry;mercury;nitrogen;oxidation;oxygen;polychlorinated dibenzodioxins;Polychlorinated Dibenzodioxins - analogs & derivatives;Polychlorinated Dibenzodioxins - chemistry;polychlorinated dibenzofurans;Sorbents;Sulfur;Surface chemistry;Toxic;toxic substances;toxicity
Date:	2015-01-01
Issue Date:	2026-04-23 14:57:46 (UTC+8)
Publisher:	Elsevier Ltd.;England
Abstract:	摘要： Activated carbon adsorbs polychlorinated dibenzo-p-dioxins and -furans (PCDD/Fs) from gas streams but can simultaneously generate PCDD/Fs via de novo synthesis, increasing an already serious disposal problem for the spent sorbent. To increase activated carbon's PCDD/F sorption capacity and lifetime while reducing the impact of hazardous waste, it is beneficial to develop carbon-based sorbents that simultaneously destroy PCDD/Fs while adsorbing the toxic chemicals from gas streams. In this work, hydrogen-treated and surface-functionalized (i.e., oxygen, bromine, nitrogen, and sulfur) activated carbons are tested in a bench-scale reactor as adsorbents for PCDD/Fs. All tested carbons adsorb PCDD/F efficiently, with international toxic equivalent removal efficiencies exceeding 99% and mass removal efficiencies exceeding 98% for all but one tested material. Hydrogen-treated materials caused negligible destruction and possible generation of PCDD/Fs, with total mass balances between 100% and 107%. All tested surface-functionalized carbons, regardless of functionality, destroyed PCDD/Fs, with total mass balances between 73% and 96%. Free radicals on the carbon surface provided by different functional groups may contribute to PCDD/F destruction, as has been hypothesized in the literature. Surface-functionalized materials preferentially destroyed higher-order (more chlorine) congeners, supporting a dechlorination mechanism as opposed to oxidation. Carbons impregnated with sulfur are particularly effective at destroying PCDD/Fs, with destruction efficiency improving with increasing sulfur content to as high as 27%. This is relevant because sulfur-treated carbons are used for mercury adsorption, increasing the possibility of multi-pollutant control. 其他題名： Chemosphere 出版者： England 出版日期： 2015-01 出處： Chemosphere (Oxford), 2015-01, Vol.118, p.136-142 版權： Copyright © 2014 Elsevier Ltd. All rights reserved. 識別號： ISSN: 0045-6535 識別號： ISSN: 1879-1298 識別號： EISSN: 1879-1298 識別號： DOI: 10.1016/j.chemosphere.2014.07.055 識別號： PMID: 25150825
Appears in Collections:	[Graduate Institute of Environmental Engineering ] journal & Dissertation

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