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제108회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Reductive Dechlorination of Octachlorodibenzo-p-dioxin by Nanosized Zerovalent Metals

2011년 8월 5일 16시 11분 05초
Ⅳ-ENVR.P-346 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
금 <발표Ⅳ>
저자 및
김재환, 장윤석
포항공과대학교 환경공학부, Korea
Polychlorinated dibenzo-p-dioxins (PCDDs) among widespread persistent organic pollutants (POPs) are liberated into the environment as a result of incineration process and byproducts during chlorinated chemical manufacture. They are of environmental issues because of their high toxicity, bioaccumulation, long half-lives, and recalcitrance to degradation. Hence, the effective and feasible remediation technologies are necessary to transfer these compounds into environmentally non-toxic forms. Dechlorination of PCDDs by zerovalent metals is thermodynamically favorable, but the dechlorination pathways of PCDDs with 256 reactions linking 76 congeners have not been clearly described in the literature. In this study, dechlorination of octachlorodibenzo-p-dioxin (OCDD) was investigated by using various nanosized zero-valent metals as catalyst like aluminum, zinc, iron and nickel under ambient conditions. After 2 days, nickel and iron, aluminum among nZVMs couldn’t dechlorinate PCDDs whereas zinc shows relatively rapid stepwise dechlorination of OCDD. The formation of tetra- to hepta- dechlorinated congeners was observed. With the help of experimental data, a modeling process developed in previous study was applied to assess reductive dechlorination by the electron transfer for PCDDs degradation. The experimentally observed results mostly correspond with the predicted modeling, considering the complexity of the OCDD dechlorination pathway with 256 theoretical reactions. Reductive dechlorination of PCDDs form dechlorinated products that can be further degraded to lower chlorinated congeners which are readily oxidized by aerobic microorganisms and by a radical oxidation.