Aqueous-Phase Dechlorination of Toxic Chloroethylenes by Vitamin B 12 Cobalt Center: Conventional and Polypyrrole Film-Based Electrochemical Studies

D. K. Ahuja, V. G. Gavalas, Leonidas G Bachas, D. Bhattacharyya

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

This paper is focused on the dechlorination of trichloroethylene (TCE) and cis-dichloroethylene (cis-DCE) by the cobalt-centered molecule vitamin B 12. The natural oxidation state of cobalt in vitamin B12 is +3, and +1 is the active form, which carries out the reduction; hence, transformation to the +1 state is essential to carrying out the reduction of chlorinated organics. With respect to achieving this transformation, two different sets of studies were undertaken: (i) conventional chemical reductions in the presence of a bulk reductant, namely, titanium(III) citrate, and (ii) a novel electrochemical reduction involving constant application of an appropriate potential. The conventional chemical reduction reactions were performed at varying concentrations of titanium(III) citrate. The electrochemical reduction reactions comprised (a) electrochemical polymerization of a pyrrole monomer, involving simultaneous entrapment of vitamin B12 in the film with subsequent use of the film for dechlorination, and (b) aqueous-phase electrochemical dechlorination at various solution-phase concentrations of vitamin B12 in the presence of the polypyrrole film on the surface of the electrode.

Original languageEnglish (US)
Pages (from-to)1049-1055
Number of pages7
JournalIndustrial and Engineering Chemistry Research
Volume43
Issue number4
StatePublished - Feb 18 2004
Externally publishedYes

Fingerprint

Vinyl Chloride
Dechlorination
Poisons
Vitamins
Polypyrroles
dechlorination
Vitamin B 12
vitamin
Cobalt
cobalt
Titanium
Citric Acid
titanium
Dichloroethylenes
Trichloroethylene
Pyrroles
Electropolymerization
Reducing Agents
trichloroethylene
polymerization

ASJC Scopus subject areas

  • Polymers and Plastics
  • Environmental Science(all)
  • Chemical Engineering (miscellaneous)

Cite this

Aqueous-Phase Dechlorination of Toxic Chloroethylenes by Vitamin B 12 Cobalt Center : Conventional and Polypyrrole Film-Based Electrochemical Studies. / Ahuja, D. K.; Gavalas, V. G.; Bachas, Leonidas G; Bhattacharyya, D.

In: Industrial and Engineering Chemistry Research, Vol. 43, No. 4, 18.02.2004, p. 1049-1055.

Research output: Contribution to journalArticle

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