Removal of Hexavalent Chromium Using Coffee Husk

N. Ahalya 1, R.D. Kanamadi 2 and T.V. Ramachandra 1, 3
1 Energy & Wetlands Research Group, Centre for Ecological Sciences, Indian Institute of Science, Bangalore 560 012, India
2 Department of Zoology, Karnataka University, Dharwad, India
3 Centre for Sustainable Technologies, Indian Institute of Science
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   Corresponding Author :
Dr. T.V. Ramachandra
Energy & Wetlands Research Group, Centre for Ecological Sciences, Indian Institute of Science, Bangalore 560 012, India
Tel: 91-080-23600985 / 2293 3099/ 2293 2506, Fax: 91-080-23601428 /23600085 /2360685 (CES TVR)
E Mail: cestvr@ces.iisc.ernet.in , ahalya@ces.iisc.ernet.in , energy@ces.iisc.ernet.in

Abstract

The potential to remove chromium (VI) from aqueous solutions through biosorption using coffee husk was investigated. Effects of pH, contact time, initial concentration and adsorbent dosage on the adsorption of Cr (VI) were studied. The data obeyed Langmuir and Freundlich adsorption isotherms. The Langmuir adsorption capacity was found to be 44.95 mg/g.  Freundlich constants Kf and n were 1.027 [mg/g (L/mg)n] and 1.493 respectively. Desorption studies indicated the removal of 60% of the hexavalent chromium. Infrared spectral studies revealed the presence of functional groups on the surface of the biomass like hydroxyl and carboxyl groups, which facilitates biosorption of Cr (VI).

Key words: Chromium (VI); coffee husk; low cost biosorbent; adsorption; infrared analysis.
Citation: Ahalya .N, Kanamadi .R.D, and Ramachandra T V. Removal of Hexavalent Chromium Using Coffee Husk. Int. J. Environment and Pollution, Vol. X, No. Y, XXXX.
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