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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472
EISSN: 1735-2630
Vol. 9, No. 3, 2012, pp. 463-472
Bioline Code: st12047
Full paper language: English
Document type: Research Article
Document available free of charge

International Journal of Environment Science and Technology, Vol. 9, No. 3, 2012, pp. 463-472

 en Adsorption of chromium (VI) from aqueous solution by the iron (III)-impregnated sorbent prepared from sugarcane bagasse
Zhu, Y.; Zhang, H.; Zeng, H.; Liang, M. & Lu, R.

Abstract

An iron (III)-impregnated sorbent was prepared from sugarcane bagasse and ferric chloride solution via carbonization/activation in a muffle furnace at 500 °C for 4 h. The adsorption removal of chromium (VI) from aqueous solution by the iron (III)-impregnated sorbent was then studied in a batch system. With increasing initial chromium (VI) concentration from 25 to 130 mg/L at an adsorbent dose of 300 mg/50 mL, the amount of adsorbed chromium (VI) increased from 4.15 to 12.20 mg/g at 20 °C, from 4.16 to 12.50 mg/g at 30 °C, and from 4.16 to 13.72 mg/g at 40 °C. The dynamical data fit very well with the pseudo-second-order kinetic model, and the calculated adsorption capacities of 4.16, 8.37, and 13.37 mg/g were equal to the actual values of the experiments at the initial chromium (VI) concentrations of 25, 50, and 100 mg/L, respectively. The Langmuir isotherm could yield better fits than the Freundlich isotherm. The calculated isotherm parameters confirmed the favorable adsorption of chromium (VI) on the iron (III)-impregnated sorbent.

Keywords
Adsorption removal; Agricultural waste; Hematite; Hexavalent chromium; Isotherm; Kinetic model

 
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