DC Field | Value | Language |
---|---|---|
dc.contributor.author | Amir, Amnorzahira | ko |
dc.contributor.author | Lee, Woojin | ko |
dc.date.accessioned | 2013-03-11T06:23:34Z | - |
dc.date.available | 2013-03-11T06:23:34Z | - |
dc.date.created | 2012-02-06 | - |
dc.date.created | 2012-02-06 | - |
dc.date.issued | 2011-06 | - |
dc.identifier.citation | CHEMICAL ENGINEERING JOURNAL, v.170, pp.492 - 497 | - |
dc.identifier.issn | 1385-8947 | - |
dc.identifier.uri | http://hdl.handle.net/10203/98498 | - |
dc.description.abstract | We 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.language | English | - |
dc.publisher | ELSEVIER SCIENCE SA | - |
dc.subject | CARBON-TETRACHLORIDE | - |
dc.subject | ZEROVALENT IRON | - |
dc.subject | ELECTRON SHUTTLE | - |
dc.subject | AQUEOUS-SOLUTION | - |
dc.subject | PARTICLES | - |
dc.subject | TRANSFORMATION | - |
dc.subject | NANOPARTICLES | - |
dc.subject | KINETICS | - |
dc.subject | TRICHLOROETHYLENE | - |
dc.subject | ELECTROCHEMISTRY | - |
dc.title | Enhanced reductive dechlorination of tetrachloroethene by nano-sized zero valent iron with vitamin B-12 | - |
dc.type | Article | - |
dc.identifier.wosid | 000292947200018 | - |
dc.identifier.scopusid | 2-s2.0-79957477587 | - |
dc.type.rims | ART | - |
dc.citation.volume | 170 | - |
dc.citation.beginningpage | 492 | - |
dc.citation.endingpage | 497 | - |
dc.citation.publicationname | CHEMICAL ENGINEERING JOURNAL | - |
dc.identifier.doi | 10.1016/j.cej.2011.01.048 | - |
dc.contributor.localauthor | Lee, Woojin | - |
dc.type.journalArticle | Article | - |
dc.subject.keywordAuthor | nZVI | - |
dc.subject.keywordAuthor | Vitamin B-12 | - |
dc.subject.keywordAuthor | PCE | - |
dc.subject.keywordAuthor | Electron mediator | - |
dc.subject.keywordAuthor | Reductive dechlorination | - |
dc.subject.keywordPlus | CARBON-TETRACHLORIDE | - |
dc.subject.keywordPlus | ZEROVALENT IRON | - |
dc.subject.keywordPlus | ELECTRON SHUTTLE | - |
dc.subject.keywordPlus | AQUEOUS-SOLUTION | - |
dc.subject.keywordPlus | PARTICLES | - |
dc.subject.keywordPlus | TRANSFORMATION | - |
dc.subject.keywordPlus | NANOPARTICLES | - |
dc.subject.keywordPlus | KINETICS | - |
dc.subject.keywordPlus | TRICHLOROETHYLENE | - |
dc.subject.keywordPlus | ELECTROCHEMISTRY | - |
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