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Electronic Journal of Biotechnology
Universidad Católica de Valparaíso
ISSN: 0717-3458
Vol. 8, No. 3, 2005, pp. 258-264
Bioline Code: ej05029
Full paper language: English
Document type: Research Article
Document available free of charge

Electronic Journal of Biotechnology, Vol. 8, No. 3, 2005, pp. 258-264

 en Biosorption of chromium (VI) from aqueous solutions by the husk of Bengal gram ( Cicer arientinum check for this species in other resources )
Ahalya, N.; Kanamadi, R. D. & Ramachandra, T. V.

Abstract

The potential to remove Cr (VI) from aqueous solutions through biosorption using the husk of Bengal gram ( Cicer arientinum check for this species in other resources ), was investigated in batch experiments. The results showed removal of 99.9% of chromium in the 10 mgl-1 chromium solution, the biomass required at saturation was 1 g mg-1. Kinetic experiments revealed that the dilute chromium solutions reached equilibrium within 180 min. The biosorptive capacity of the (bgh) was dependent on the pH of the chromium solution, with pH 2 being optimal. The adsorption data fit well with the Langmuir and Freundlich isotherm models. The adsorption capacity calculated from the Langmuir isotherm was 91.64 mg Cr (VI)/g at pH 2. The adsorption capacity increased with increase in agitation speed and an optimum was achieved at 120 rpm. The biosorption of Cr (VI) was studied by Fourier transform infrared spectroscopy (FTIR), which suggested that the presence of Cr (VI) ions in the biomass affects the bands corresponding to hydroxyl and carboxyl groups. Comprehensive characterisation of parameters indicates bgh to be an excellent material for biosorption of Cr (VI) to treat wastewaters containing low concentration of the metal.

Keywords
agro-wastes, Bengal gram husk (bgh), Cicer arientinum, chromium biosorption, isotherms, fourier transform infrared spectroscopy (FTIR).

 
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