Capacity of zerovalent irons to reduce aqueous Cr(Ⅵ)
(0) Zerovalent iron (ZVI) has drawn great interests as an effective and inexpensive tool to enhance degradation of various environmental contaminants. Reduction of Cr(Ⅵ) to Cr(Ⅲ) by ZVI merits an environmental concern as the hazardous species is transformed into the non-hazardous one Objectives of this research were to assess kinetics and capacity for Cr(Ⅵ) reduction by different sources of ZVIs of which chemical parameters can base in situ application of ZVI to treat Cr(Ⅵ) contaminated water. Reduction kinetics were first-ordered and rapid, showing that 50％ of the initial Cr(Ⅵ) was reduced within 7.0 to 347 rain depending on Cr(Ⅵ) concentration, temperature and ZVI source. The reduction rates increased as the initial Cr(Ⅵ) concentrations decreased and the reaction temperatures increased. The J ZVI (Shinyo Pure Chemical Co., Japan) was more effective for Cr(Ⅵ) reduction than PU (Peerless Metal Powders, USA). The maximum reduction capacities of J and PU ZVIs at 25℃ were 0. 045 and 0. 042mol·g <1> Fe<0>, respectivly. A relatively higher value of the net reaction energy (E<,a>) indicated that Cr(Ⅵ) reduction by ZVI was temperature dependent and controlled by surface properties of ZVI. Chemical parameters involved in the Cr(Ⅵ) reduction by ZVI such as temperature quotient, kinetic rates, and stoichiometry indicated that the ZVI might be effective for in situ treatment of the Cr(Ⅵ) containing wastewater.
Cr(Ⅵ) reduction first-order kinetics reduction capacity zerovalent iron
Jae E. Yang Jong Sung Kim Yong Sik Ok Su-Jung Kim Kyung-Yoal Yoo Won-Il Kim
Division of Biological Environment, Kangwon National University, Chuncheon, 200-701, South Korea School of Natural Resources, University of Nebraska, Lincoln, Nebraska 68583-0915, USA Department of Renewable Resources, University of Alberta, Edmonton, Alberta T6G 2E3, Canada National Institute of Agricultural Science and Technology, RDA, Suwon, 441-857, South Korea
国际会议
第九届痕量元素生物地球化学国际会议(9th International Conference on the Biogeochemistry of Trace Elements)
北京
英文
805-806
2007-07-15（万方平台首次上网日期，不代表论文的发表时间）