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Reductive Degradation Kinetics and Pathways of Chlorophenolic Organic Pollutants by Nickel-Coated Zero Valent Iron  

Shin, Seung-Chul (Department of Civil Engineering, Kyunghee University)
Kim, Young-Hun (Department of Environmental Engineering, Andong National University)
Ko, Seok-Oh (Department of Civil Engineering, Kyunghee University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.28, no.5, 2006 , pp. 487-493 More about this Journal
Abstract
Reductive dechlorination of chlorophenols by nickel coated iron was investigated to understand the feasibility of using Ni/Fe for the in situ remediation of contaminated groundwater. Zero Valent Iron(ZVI) was amended with Ni(II) ions to form bimetal(Ni/Fe). Dechlorination of five chlorophenol compounds and formation of intermediates were examined using Ni/Fe. Rate constant for each reaction pathway was quantified by the numerical integration of a series of differential rate equation. Experimental results showed that the sequence of hydrodechlorination rate constant was in the order of 2-CP>4-CP>2,4-DCP>2,4,6-TCP>2,6-DCP. The hydrodechlorination pathways for the conversion of each chlorophenol compound involves a full dechlorination to phenol via both concerted and stepwise mechanisms. Reaction pathways and corresponding kinetic rate constants were suggested based on the experiments and numerical simulations.
Keywords
Chlorophenols; Nickel Coated Iron; Dechlorination; Kinetics; Pathways;
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