Enhanced reductive dechlorination of tetrachloroethene by nano-sized zero valent iron with vitamin B-12

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dc.contributor.authorAmir, Amnorzahirako
dc.contributor.authorLee, Woojinko
dc.date.accessioned2013-03-11T06:23:34Z-
dc.date.available2013-03-11T06:23:34Z-
dc.date.created2012-02-06-
dc.date.created2012-02-06-
dc.date.issued2011-06-
dc.identifier.citationCHEMICAL ENGINEERING JOURNAL, v.170, pp.492 - 497-
dc.identifier.issn1385-8947-
dc.identifier.urihttp://hdl.handle.net/10203/98498-
dc.description.abstractWe demonstrated that the addition of vitamin B-12 can significantly enhance the reductive dechlorination of tetrachloroethene (PCE) by nano-sized zero valent iron (nZVI). A remarkable reductive dechlorination of PCE (0.25 +/- 0.01 h(-1)) was observed in nZVI suspension (0.05 g/24 mL) with 0.5 mM vitamin B-12 in 6 h, while no significant reductive dechlorination of PCE was observed in the nZVI suspension without vitamin B-12. Vitamin B-12r of which central metal is Co2+ was identified as predominant specie during the dechlorination of PCE. The dechlorination kinetic rate constant of PCE in nZVI/vitamin B-12 system was significantly dependent on the suspension pH and concentrations of vitamin B-12, nZVI, and PCE. An enhancement in PCE dechlorination kinetic (0.180 +/- 0.006-0.709 +/- 0.004 h(-1)) due to the formation of hydroxovitamin B-12r was observed by increasing the suspension pH (5-9). The dechlorination kinetic rate constant of PCE increased proportionally (0.0010 +/- 0.0009-1.3660 +/- 0.2940 h(-1)) as the concentration of vitamin B-12 increased (5 nM to 5 mM). As the concentration of nZVI increased by 50 times (0.01-0.50 g), the dechlorination kinetic increased approximately 137 times (0.007 +/- 0.001-0.961 +/- 0.182 h(-1)). However, the dechlorination kinetic decelerated (0.184 1 +/- 0.010-0.039 +/- 0.006 h(-1)) as PCE concentration increased (0.005-1.0 mM). This study provides basic understanding on the role of vitamin B-12/vitamin B-12r as an electron mediator in the enhanced reductive dechlorination of PCE by nZVI occasionally observed in remediation sites. (C) 2011 Elsevier B.V. All rights reserved.-
dc.languageEnglish-
dc.publisherELSEVIER SCIENCE SA-
dc.subjectCARBON-TETRACHLORIDE-
dc.subjectZEROVALENT IRON-
dc.subjectELECTRON SHUTTLE-
dc.subjectAQUEOUS-SOLUTION-
dc.subjectPARTICLES-
dc.subjectTRANSFORMATION-
dc.subjectNANOPARTICLES-
dc.subjectKINETICS-
dc.subjectTRICHLOROETHYLENE-
dc.subjectELECTROCHEMISTRY-
dc.titleEnhanced reductive dechlorination of tetrachloroethene by nano-sized zero valent iron with vitamin B-12-
dc.typeArticle-
dc.identifier.wosid000292947200018-
dc.identifier.scopusid2-s2.0-79957477587-
dc.type.rimsART-
dc.citation.volume170-
dc.citation.beginningpage492-
dc.citation.endingpage497-
dc.citation.publicationnameCHEMICAL ENGINEERING JOURNAL-
dc.identifier.doi10.1016/j.cej.2011.01.048-
dc.contributor.localauthorLee, Woojin-
dc.type.journalArticleArticle-
dc.subject.keywordAuthornZVI-
dc.subject.keywordAuthorVitamin B-12-
dc.subject.keywordAuthorPCE-
dc.subject.keywordAuthorElectron mediator-
dc.subject.keywordAuthorReductive dechlorination-
dc.subject.keywordPlusCARBON-TETRACHLORIDE-
dc.subject.keywordPlusZEROVALENT IRON-
dc.subject.keywordPlusELECTRON SHUTTLE-
dc.subject.keywordPlusAQUEOUS-SOLUTION-
dc.subject.keywordPlusPARTICLES-
dc.subject.keywordPlusTRANSFORMATION-
dc.subject.keywordPlusNANOPARTICLES-
dc.subject.keywordPlusKINETICS-
dc.subject.keywordPlusTRICHLOROETHYLENE-
dc.subject.keywordPlusELECTROCHEMISTRY-
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CE-Journal Papers(저널논문)
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