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제108회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Reductive Dechlorination of Tetrachloroethene by Complexation between Mackinawite and Cobalamins: Reaction Mechanisms

등록일
2011년 8월 1일 14시 27분 33초
접수번호
1117
발표코드
Ⅳ-ENVR.P-336 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
금 <발표Ⅳ>
발표형식
포스터
발표분야
환경에너지
저자 및
공동저자
amnorzahira, 이우진1
KAIST 건설및환경공학과, Korea
1KAIST 건설 및 환경공학과, Korea
This study demonstrates reaction mechanisms on the reductive dechlorination of Tetrachloroethene (PCE) by complexation between mackinawite and cobalamins at pH 8.3. Reductive dechlorination of PCE in FeS-Cobalamin(III) suspension (0.0187 hr-1) was 14 times faster than that in FeS suspension (0.0013 hr-1) in 36 hrs. Three main reaction mechanisms of the reductive dechlorination of PCE were identified; (1) Adsorption of cobalamin (III) onto FeS surfaces, (2) Complexation of FeS with cobalamin(III), and (3) Reduction of cobalamin(III) by Fe2+-FeS and S2--FeS. Adsorption of cobalamin(III) on FeS surface follows Langmuir adsorption isotherm. Complexation of FeS with reduced cobalamin species was identified at 340nm using UV-Vis spectroscopy. Reduction of cobalamin(III) to cobalamin(II) and cobalamin(I) were identify based on the compositions of Fe2+-FeS, Fe3+-FeS and S2--FeS in FeS-cobalamin(III) and FeS-cobalamin(II) suspensions by XPS analysis. Approximately 80% of Fe2+-FeS was oxidized to Fe3+-Fes in FeS-Cobalamin(III) suspension, which indicates that cobalamin(III) was reduced to cobalamin(II). Composition of S2--FeS in FeS-Cobalamin(II) suspension shows significant changes (19%) in the oxidation of S2--FeS to S--FeS, indicating that cobalamin(II) was reduced to cobalamin(I). This experimental work reveals that the complexation of FeS-Cobalamin(I) and FeS-Cobalamin(II) play important roles as electron-mediator to accelerate reductive dechlorination of chlorinated organic compounds

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