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Language: English

Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received April 25, 2007
Accepted October 5, 2007

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Fe(II)-initiated reduction of hexavalent chromium in heterogeneous iron oxide suspension

Jeongyun Choi Yoojin Jung¹ Woojin Lee^2†

R&D Center, Samsung Engineering Co., Ltd., 415-10 Wancheon-dong, Youngtong-gu, Suwon 443-823, Korea ¹Department of Civil and Environmental Engineering, University of Delaware, Newark, DE 19716, USA ²Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology, 373-1 Guseong-dong, Yuseong-gu, Daejeon 305-701, Korea

woojin_lee@kaist.ac.kr

Korean Journal of Chemical Engineering, July 2008, 25(4), 764-769(6), 10.1007/s11814-008-0125-z

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Abstract

The characteristics of Fe(II)-initiated reduction of Cr(VI) in iron oxide suspensions were investigated by conducting a series of kinetic experiments. A modified Langmuir-Hinshelwood kinetic model was used to provide a better description of Cr(VI) reduction kinetics which were believed to be occurring on the limited reactive site of reductant. The concentration of magnetite concentration as well as Cr(VI) concentration, significantly affected the reaction kinetics of Cr(VI). The reduction kinetics were improved with increasing magnetite and Cr(VI) concentration. Almost 95% of Cr(VI) reduction was achieved within 10 min at the condition of 8 g/L of magnetite and 80 mg/L of initial Cr(VI), respectively. The solution pH also affected the reaction rate in the range of 5.5 and 8.0 where a lower pH produced a faster reaction rate. The addition of Fe(II) on soil and magnetite showed the capability of improving Cr(VI) reduction kinetics, and their reduction kinetics was also well described by using a Langmuir-Hinshelwood kinetic model. The experimental results obtained in this research clearly show the advantage of additional reductant for reducing Cr(VI), and they can provide basic knowledge for the development of remediation technology for the treatment of groundwater and soil contaminated with Cr(VI).

Keywords

Chromium(VI) Modified Langmuir-Hinshelwood Kinetics Magnetite Reduction Fe(II) Addition

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