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Received August 23, 2023
Accepted August 23, 2023
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Consideration of the methods for evaluating the Cr(VI)-removing capacity of biomaterial
Department of Environmental Engineering, Yensei University, Wonju 220-710, Korea 1Department of Environmental Engineering, Kyungpook National University, Daegu 702-701, Korea 2Advanced Environmental Biotechnology Research Center, Division of Advanced Nuclear Engineering,Department of Chemical Engineering, School of Environmental Science and Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea
daesung@knu.ac.kr
Korean Journal of Chemical Engineering, March 2011, 28(3), 831-836(6), 10.1007/s11814-010-0453-7
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Abstract
Over the last few decades, many researchers have tested various biomaterials for the removal of toxic Cr(VI) from aquatic systems. It is now widely accepted that the mechanism of Cr(VI) biosorption is not ‘anionic adsorption’ but ‘adsorption-coupled reduction’. Unfortunately, however, many researchers have still used common equilibrium isotherm models, such as Langmuir and Freundlich ones, based on ‘anionic adsorption’ mechanism in order to evaluate the Cr(VI)-removing capacity of biomaterial tested. In this study, a fermentation waste of Corynebacterium glutamicum, capable of removing Cr(VI) efficiently, was used as a model biomaterial to show why equilibrium isotherm models cannot be used to evaluate the Cr(VI)-removing capacity of biomaterial. Meanwhile, some alternative methods considering the mechanism of Cr(VI) biosorption were suggested; the maximum Cr(VI)-removing capacity of the biomaterial could be evaluated by a Cr(VI)-biosorption experiment under biomaterial-limited condition as well as by a simplified kinetic model based on the reduction mechanism of Cr(VI).
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Memon JR, Memon SQ, Bhanger MI, El-Turki A, Hallam KR, Allen GC, Colloid. Surf. B., 70, 232 (2009)
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Park D, Yun YS, Park JM, Environ. Sci. Technol., 38, 4860 (2004)
Park D, Yun YS, Park JM, Water Res., 39, 533 (2005)
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Won SW, Choi SB, Chung BW, Park D, Park JM, Yun YS, Ind. Eng. Chem. Res., 43(24), 7865 (2004)
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