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  • A Study for Reductive Degradation and Surface Characteristics of Hexachloroethane by Iron Sulfide (FeS,FeS2)
  • Park Sang-Won;Kim Sung-Kuk;Heo Jae-Eun;
  • Faculty of Environmental Science and Engineering, Keimyung University;Faculty of Environmental Science and Engineering, Keimyung University;Faculty of Environmental Science and Engineering, Keimyung University;
  • 황화철(FeS,FeS2)을 이용한 헥사클로로에탄의 환원적 분해반응과 표면특성에 관한 연구
  • 박상원;김성국;허재은;
  • 계명대학교 환경학부;계명대학교 환경학부;계명대학교 환경학부;
Abstract
The following results were obtained in the reductive degradation of hexachloroethane (HCA), and surface characteristics by using iron sulfide (FeS,FeS2) mediators. HCA was degraded to pentachloroethane (PCA), tetrachloroethylene(PCE), trichloroethylene(TCE) and cis-l,2-dichloroethylene (cis-1,2-DCE) by complicated pathways such as hydrogenolysis, dehaloelimination and dehydrohalogenation. FeS had more rapid degradation rates of organic solvent than FeS2. In liquidsolid reaction, the reaction rates of organic solvents were investigated to explain surface characteristics of FeS and FeS2.. To determine surface characteristics of FeS and FeS2, the specific surface area and surface potential of each mineral was determined and the hydrophilic site (Ns) was calculated. The specific surface area (107.0470m2/gand92.6374m2/g) and the pHZPC of minerals (FeSPHZPC=7.42,FeS2,PHZPC=7.80) were measured. The results showed that the Ns of FeS and FeS2 were 0.053site/mm2and0.205site/mm2, respectively. FeS2 had more hydrophilic surface than FeS. In other words, FeS have more hydrophobic surface site than FeS2.

본 논문에서는 황화철(FeS,FeS2) 유기 용매의 환원적 분해 반응과의 표면특성의 관계에 대해서 다음과 같은 결과를 얻었다. hexachloroethane(HCA)은 수소첨가반응, 탈염소제거반응과 탈수소탈염소화반응으로 pentachloroethane(PCA), tetrachloroethylene(PCE), trichloroethylene(TCE)와 cis-1,2-dichloroethylene(cis-1,2-DCE)로 분해되었다. FeS와 FeS2를 반응 매개물로 HCA에 대한 반응에서 FeS는 FeS2보다 분해반응 속도가 빠르게 나타났다. FeS와 FeS2의 표면 특성 연구에서 각 광물질에 대한 친수성 표면 자리(Ns)를 정량적으로 계산하기 위해서 비표면적 값(107.0470m2/g92.6374m2/g)과 표면 전위를 측정에 측정된 PHZPC(FeS,PHZPC=7.42,FeS2,PHZPC=7.80) 값을 이용해서 계산한 결과 FeS와 FeS2Ns값은 각각 0.053site/nm2,0.205site/nm2으로 나타났다. 그리고 0.2 g/L Fe광물질에 대한 실질적인 친수성 표면 농도는 각각 3.303×106mol/L1.102×105mol/L 나타났다. FeS2는 FeS에 비해 훨씬 친수성 표면임을 실험 결과 확인하였다. FeS와 FeS2의 두 광물질 중에서 유기 용매의 환원 반응 속도는 FeS가 훨씬 빠르게 나타났다.

Keywords: Reductive degradation;Chlorinated compounds;Iron sulfide;Hydrophilic & phobic site;

Keywords: 환원적 분해반응;염소계 유기오염물질;황화철;친수 & 소수성 표면자리;

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This Article

  • 2006; 11(5): 35-42

    Published on Oct 31, 2006