Hexavalent chromium adsorption by a novel activated carbon prepared by microwave activation

Kundu, A. and Redzwan, G. and Sahu, J.N. and Mukherjee, S. and Gupta, B.S. and Hashim, M.A. (2014) Hexavalent chromium adsorption by a novel activated carbon prepared by microwave activation. BioResources, 9 (1). pp. 1498-1518. ISSN 1930-2126,

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Microwave heating reduces the preparation time and improves the adsorption quality of activated carbon. In this study, activated carbon was prepared by impregnation of palm kernel fiber with phosphoric acid followed by microwave activation. Three different types of activated carbon were prepared, having high surface areas of 872 m² g-1, 1256 m² g-1, and 952 m² g-1 and pore volumes of 0.598 cc g-1, 1.010 cc g-1, and 0.778 cc g-1, respectively. The combined effects of the different process parameters, such as the initial adsorbate concentration, pH, and temperature, on adsorption efficiency were explored with the help of Box-Behnken design for response surface methodology (RSM). The adsorption rate could be expressed by a polynomial equation as the function of the independent variables. The hexavalent chromium adsorption rate was found to be 19.1 mg g-1 at the optimized conditions of the process parameters, i.e., initial concentration of 60 mg L-1, pH of 3, and operating temperature of 50 oC. Adsorption of Cr(VI) by the prepared activated carbon was spontaneous and followed second-order kinetics. The adsorption mechanism can be described by the Freundlich Isotherm model. The prepared activated carbon has demonstrated comparable performance to other available activated carbons for the adsorption of Cr(VI).

Item Type: Article
Uncontrolled Keywords: Activated carbon; Palm kernel fiber; RSM; Box-Behnken; Chromium
Subjects: Q Science > Q Science (General)
Divisions: Faculty of Science > Institute of Biological Sciences
Depositing User: Ms. Wati Yusuf
Date Deposited: 13 Oct 2014 01:29
Last Modified: 13 Oct 2014 01:29
URI: http://eprints.um.edu.my/id/eprint/10519

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