Adsorption of Fast Green on to Coffee Husk

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N. Ahalya1, M.N. Chandraprabha1, R.D. Kanamadi2, T.V. Ramachandra3,*

1Department of Biotechnology, M.S. Ramaiah Institute of Technology,Bangalore.
2Department of Zoology, Karnatak University, Dharwad, Karnataka.
3 Centre for Ecological Sciences, Indian Institute of Science, Bangalore
*Corresponding author: T.V. Ramachandra,

Citation: N. Ahalya, M.N. Chandraprabha1, R.D. Kanamadi and T.V. Ramachandra. Adsorption of Fast Green on to Coffee Husk, Journal of Chemical Engineering and Research Volume 2, Number 1 (2014), pp. 201-207 ,


In the present study, agricultural waste coffee husk were used for the adsorption of the dye fast green. The operating variables studied were initial concentration, initial solution pH, adsorbent dosage and contact time. Experimental equilibrium data were fitted to Freundlich and Langmuir isotherms. The kinetics of fast green onto coffee husk was found to follow a pseudo first order kinetics. The maximum adsorption of fast green was mg/g of the adsorbent respectively. The Fourier transformed infrared spectroscopy reveals that –OH, C=O and C-O groups are involved in the adsorption process. The optimum pH for the adsorption of fast green was 2. Characterization of the coffee husk shells showed that the relative percentage of protein is very less making it an excellent adsorbent for the removal of dyes from wastewater effluents.

Keywords: Coffee husk, fast green, adsorption, isotherm.