본 연구에서는 지하수에 존재하는 다양한 클로로페놀류 화합물을 제거하기 위하여 니켈로 코팅된 영가철을 이용하여 적용 타당성을 검토하였다. 다섯가지 종류의 클로로페놀 화합물을 대상으로 처리효과를 평가하였으며 중간 생성물을 분석하였다. 실험결과를 이용하여 개질된 영가철에 의한 반응경로 및 반응율을 평가하기 위하여 수치해석적 방법을 적용하였다. 개질된 영가철에 의한 오염물의 제거는 반응계수를 기준으로 2-CP>4-CP>2,4-DCP>2,4,6-TCP>2,6-DCP의 순서를 나타내었다. 수치해석 결과 각 클로로페놀 화합물의 탈염소화 반응은 연속적 단계와 평행적 단계를 거쳐 최종 생성물인 페놀화합물에 도달되는 결과를 보여주었다.
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.
