Development of Activity Enhanced Zero Valent Metals for Permeable Reactive Barrier

침투성 반응벽체를 위한 고활성 영가금속 개발

  • Published : 2003.02.01


The dechlorination of chlorinated methanes by iron powder and palladium coated iron (Pd/Fe) was studied in batch experiments. Iron powder dechlorinated carbon tetrachloride (CT) with a half-life of 4 days. Three chloromethane was found as major product and less chlorinated daughters. Mass balance found was to be about 93-99%. Pd/Fe showed very enhanced reactivity for CT in comparing with plain iron. The major dechlorination products of CT were also less chlorinated methanes with Pd/Fe. Pd/Fe also degrade the produced less chlorinated compounds. Sequential reactions were occurred on Pd/Fe. As the Pd/Fe content increased, the reaction rate was increased linearly.


Zero-Valent Metals;Reduction;Dechlorination;Carbon tetrachloride;Palladium


  1. Johnson, T.L., M.M. Scherer, and P.G. Tratnyek, 1996, Kinetics of halogenated organic compound degradation by iron metal, Environ. Sci. Technol., 30, 2634-2640.
  2. Stiles, M., 1994, Nickel complexes as soluble catalysts for reductive dehalogenation of aromatic halides, J. Org. Chem., 59, 5381-5385.
  3. Wan, C., Y.H. Chen, and R. Wei, 1999, Dechlorination of chloromethanes on iron and palladium-iron bimetallic surface in aqueous systems, Environ. Toxicol. Chem., 18, 1091-1096.
  4. Sivavec, T.M., P.D. Mackenzie, and D.P. Horney, 1997, Effect of Site Groundwater on Reactivity of Bimetallic Media: Deactivation of Nickel-Plated Granular Iron. 213th Natl Meet., Am. Chem. Soc., Div. Environ. Chem., 83-85pp.
  5. Clark, W.M., 1960, Oxidation-Reduction potentials of organic systems, The Williams & Wilkins Company, Baltimore.
  6. Schreier, C.G. and M. Reinhard, 1995, Catalytic hydrodehalogenation of chlorinated ethylenes using palladium and hydrogen for the treatment of contaminated water, Chemosphere, 31, 3475-3487.
  7. Muftikian, R., Q. Fernando, and N. Korte, 1995, A method for the rapid dechlorination of low molecular weight chlorinated hydrocarbons in water, Water Res., 29, 2434-2439.
  8. Kim, Y.H., 1999, Reductive dechlorination of chlorinated aliphatic and aromatic compounds using zero valent metals: modified metals and electron mediators, Texas A&M University, College Station, 160pp.
  9. Appleton, E.L., 1996, A nickel-iron wall against contaminated groundwater. Environ. Sci. Technol., 30, 536A-539A.
  10. APHA, 1995, Standard method for the examination of water and wastewater, APHA, AWWA, WEF, Washington, D.C..
  11. Fennelly, J.P. and A.L. Roberts, 1998, Reaction of 1,1,1-trichloroethane with zero-valent metals and bimetallic reductants, Environ. Sci. Technol., 32, 1980-1988.
  12. Kovenklioglu, S., Z. Cao, D. Shah, R.J. Farrauto, and E.N. Balko, 1992, Direct catalytic hydrodechlorination of toxic organics in wastewater, AIChE J., 38, 1003-1012.
  13. Grittini, C., 1997, Rapid reductive dechlorination of environmentally hazardous aromatic compounds and pesticides, The University of Arizona, Tucson, 170pp.
  14. Cheng, I.F., Q. Fernando, and N. Korte, 1997, Electronchemical dechlorination of 4-chlorophenol to phenol, Environ. Sci. Technol., 31, 1074-1078.