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

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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.
Publisher
ELSEVIER SCIENCE SA
Issue Date
2011-06
Language
English
Article Type
Article
Keywords

CARBON-TETRACHLORIDE; ZEROVALENT IRON; ELECTRON SHUTTLE; AQUEOUS-SOLUTION; PARTICLES; TRANSFORMATION; NANOPARTICLES; KINETICS; TRICHLOROETHYLENE; ELECTROCHEMISTRY

Citation

CHEMICAL ENGINEERING JOURNAL, v.170, pp.492 - 497

ISSN
1385-8947
DOI
10.1016/j.cej.2011.01.048
URI
http://hdl.handle.net/10203/98498
Appears in Collection
CE-Journal Papers(저널논문)
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