Last Data Updates: 04January 2014

Last Data Updates: 04January 2014

Last data updates: 04January 2014

Hasan, S.H., Singh, K.K., Prakash, O., Talat, M. and Ho, Y.S. (2008), Removal of Cr(VI) from aqueous solutions using agricultural waste ‘maize bran’. Journal of Hazardous Materials, 152 (1), 356-365.

Documenttype:Article / Language:English / Citedreferences:29 / Timescited:31 / Timesselfcited:3

Abstract: Novel biosorbent 'maize bran' has been successfully utilized for the removal of Cr(VI) from aqueous solution. The effect of different parameters such as contact time, sorbate concentration, pH of the medium and temperature were investigated and maximum uptake of Cr(VI) was 312.52 (mg g-1) at pH 2.0, initial Cr(VI) concentration of 200mg L-1 and temperature of 40 degrees C. Effect of pH showed that maize bran was not only removing Cr(VI) from aqueous solution but also reducing toxic Cr(VI) into less toxic Cr(III). The sorption kinetics was tested with first order reversible, pseudo-first order and pseudo-second order reaction and it was found that Cr(VI) uptake process followed the pseudo-second order rate expression. Mass transfer of Cr(VI) from bulk to the solid phase (maize bran) was studied at different temperatures. Different thermodynamic parameters, viz., Delta G degrees, Delta H degrees and Delta S degrees have also been evaluated and it has been found that the sorption was feasible, spontaneous and endothermic in nature. The Langmuir and Freundlich equations for describing sorption equilibrium were applied and it was found that the process was well described by Langmuir isotherm. Desorption studies was also carried out and found that complete desorption of Cr(VI) took place at pH of 9.5. (c) 2007 Elsevier B.V. All rights reserved.

Author Keywords: Removal; Maize Bran; Chromium(VI); Sorption Isotherms; Sorption Kinetics

KeyWords Plus: Low-Cost Biosorbent; Hexavalent Chromium; Rice Husk; Water; Adsorption; Biosorption; Adsorbents; Reduction; Sorption; Biomass

Reprint Address: Hasan, SH (reprint author), Banaras Hindu Univ, Inst Technol, Dept Appl Chem, Varanasi 221005, Uttar Pradesh India

Addresses:

1. Banaras Hindu Univ, Inst Technol, Dept Appl Chem, Varanasi 221005, Uttar Pradesh India

2. Banaras Hindu Univ, Fac Sci, Dept Biochem, Varanasi 221005, Uttar Pradesh India

3. Peking Univ, Dept Environm Sci, Coll Environm Sci, Beijing 100871, Peoples R China

E-mail Addresses:

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