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Received March 19, 2009
Accepted May 6, 2009
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Surface modified granular activated carbon for enhancement of nickel adsorption from aqueous solution
Department of Environmental Health, College of Health Science, Korea University, Anam-dong, Seongbuk-gu, Seoul 136-701, Korea 1Department of Chemical and Biomolecular Engineering, Yonsei University, 262 Sungsanno, Seodaemun-gu, Seoul 120-749, Korea
Korean Journal of Chemical Engineering, November 2009, 26(6), 1748-1753(6), 10.1007/s11814-009-0274-8
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Abstract
Coal-based granular activated carbon was modified with acetates of sodium, potassium and lithium at concentrations of 10 and 15% and used as adsorbents to explore the adsorption mechanism of nickel ion in aqueous solution. Acetate treatment reduced surface area and pore volume of the activated carbons, but the adsorption amount of Ni(II) on the modified activated carbons (MAC) was greater than that on the virgin activated carbon. The adsorption depended_x000D_
on pH of the solution with an optimum at 4.5 and the adsorbed nickel could be fully desorbed by using 0.05M HCl solution. The maximum adsorption capacity of nickel ion on Li (15 wt%) modified activated carbon was 151.3 mg/g and the adsorption isotherm follows Langmuir, Sips, and Redlich-Peterson isotherm models better than the Freundlich isotherm model. The kinetic data was better fitted by a non-linear form of the pseudo-first order than the pseudo-second_x000D_
order, but the difference between two kinetic models was small.
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