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Article: Oxidative degradation of propachlor by ferrous and copper ion activated persulfate

TitleOxidative degradation of propachlor by ferrous and copper ion activated persulfate
Authors
Issue Date2012
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/scitotenv
Citation
Science of the Total Environment, 2012, v. 416, p. 507-512 How to Cite?
AbstractThe process of in situ chemical oxidation (ISCO) by persulfate (S(2)O(8)(2-)) can be accelerated by metal ion activation, which more effectively degrades subsurface pollutants by enhancing sulfate radical (SO(4)(-)) generation. This study compared the results of propachlor degradation by Cu(2+) and Fe(2+) activated persulfate and revealed differing degradation kinetics and mechanisms between the two types of activation system. The activation of persulfate by Fe(2+) ions generally resulted in rapid degradation in the early stage, but was accompanied by a dramatic decrease in efficiency due to the rapid depletion of Fe(2+) by the sulfate radicals generated. In contrast, the Cu(2+) activated persulfate had a longer lasting degradation effect and a proportionally greater degradation enhancement at elevated Cu(2+) concentrations. An optimal Fe(2+) concentration should be sought to activate the persulfate, as a high Fe(2+) concentration of 2.5mM or above, as was used in this study, may inhibit propachlor degradation due to the competitive consumption of sulfate radicals by the excess Fe(2+) ions. Higher temperatures (55 degrees C compared with 30 degrees C) resulted in enhanced metal activation, particularly with the Cu(2+) activated system. Furthermore, acidic conditions were found to be more favorable for propachlor degradation by metal activated persulfate. The ecotoxicity of degraded propachlor samples, which was indicated by average well color development (AWCD) for its microbial community activity, was confirmed to be decreased during the degradation processes with these two ions activated persulfate.
Persistent Identifierhttp://hdl.handle.net/10722/150649
ISSN
2015 Impact Factor: 3.976
2015 SCImago Journal Rankings: 1.702
ISI Accession Number ID
Funding AgencyGrant Number
State Key Laboratory of Soil and Sustainable Agriculture08112000042
National Natural Science Foundation of China40801086
Research Grants Council (RGC) of Hong KongHKU 716809E
Funding Information:

This study was funded by the open funding program of the State Key Laboratory of Soil and Sustainable Agriculture (08112000042), the National Natural Science Foundation of China (40801086), and the Research Grants Council (RGC) of Hong Kong (HKU 716809E).

References
Grants

 

DC FieldValueLanguage
dc.contributor.authorLiu, CSen_US
dc.contributor.authorShih, Ken_US
dc.contributor.authorSun, CXen_US
dc.contributor.authorWang, Fen_US
dc.date.accessioned2012-06-26T06:06:27Z-
dc.date.available2012-06-26T06:06:27Z-
dc.date.issued2012en_US
dc.identifier.citationScience of the Total Environment, 2012, v. 416, p. 507-512en_US
dc.identifier.issn0048-9697en_US
dc.identifier.urihttp://hdl.handle.net/10722/150649-
dc.description.abstractThe process of in situ chemical oxidation (ISCO) by persulfate (S(2)O(8)(2-)) can be accelerated by metal ion activation, which more effectively degrades subsurface pollutants by enhancing sulfate radical (SO(4)(-)) generation. This study compared the results of propachlor degradation by Cu(2+) and Fe(2+) activated persulfate and revealed differing degradation kinetics and mechanisms between the two types of activation system. The activation of persulfate by Fe(2+) ions generally resulted in rapid degradation in the early stage, but was accompanied by a dramatic decrease in efficiency due to the rapid depletion of Fe(2+) by the sulfate radicals generated. In contrast, the Cu(2+) activated persulfate had a longer lasting degradation effect and a proportionally greater degradation enhancement at elevated Cu(2+) concentrations. An optimal Fe(2+) concentration should be sought to activate the persulfate, as a high Fe(2+) concentration of 2.5mM or above, as was used in this study, may inhibit propachlor degradation due to the competitive consumption of sulfate radicals by the excess Fe(2+) ions. Higher temperatures (55 degrees C compared with 30 degrees C) resulted in enhanced metal activation, particularly with the Cu(2+) activated system. Furthermore, acidic conditions were found to be more favorable for propachlor degradation by metal activated persulfate. The ecotoxicity of degraded propachlor samples, which was indicated by average well color development (AWCD) for its microbial community activity, was confirmed to be decreased during the degradation processes with these two ions activated persulfate.en_US
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/scitotenven_US
dc.relation.ispartofScience of the Total Environmenten_US
dc.subject.meshAcetanilides - chemistry-
dc.subject.meshCopper - chemistry-
dc.subject.meshFerrous Compounds - chemistry-
dc.subject.meshHerbicides - chemistry-
dc.subject.meshOxidation-Reduction - drug effects-
dc.titleOxidative degradation of propachlor by ferrous and copper ion activated persulfateen_US
dc.typeArticleen_US
dc.identifier.emailLiu, CS: cecsliu@hku.hken_US
dc.identifier.emailShih, K: kshih@hkucc.hku.hk-
dc.identifier.authorityShih, K=rp00167en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.scitotenv.2011.12.004en_US
dc.identifier.pmid22226398-
dc.identifier.scopuseid_2-s2.0-84856233007en_US
dc.identifier.hkuros205533-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-84856233007&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume416en_US
dc.identifier.spage507en_US
dc.identifier.epage512en_US
dc.identifier.isiWOS:000301155200058-
dc.publisher.placeNetherlandsen_US
dc.relation.projectSorption of Perfluorochemicals on Sediments and Sludge of Hong Kong-
dc.identifier.scopusauthoridWang, F=53364861600en_US
dc.identifier.scopusauthoridSun, CX=54400276800en_US
dc.identifier.scopusauthoridShih, K=14072108900en_US
dc.identifier.scopusauthoridLiu, CS=48861430400en_US
dc.identifier.citeulike10233889-

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