JFET_V7_N1_RP4 Suantak Kamsonlian S. Suresh C.B. Majumder S. Chand Journal on Future Engineering and Technology 2230 – 7184 7 1 34 41 As(V) removal, Biosorption, Tea waste (TW), Isotherm models, Thermodynamics Removal of As(V) ion from contaminated water by biosorption using low cost tea waste (TW) biomass was investigated. The characteristic of TW as biosorbent material was analyzed by Fourier transmission infrared spectroscopy (FTIR) and Scanning electronic microscopy (SEM) to assess its surface properties. The effects of pH, temperature, dosage and contact time on the biosorption were studied and analyzed with spectrophotometer at a wavelength (Lamda) of 540 nm by crosschecking with ICP-MS in this work. The optimum pH and temperature for the efficiency of biosorption of As(V) were found to be 4 and 35 degree C. Maximum uptake capacity of As(V) ion was obtained as 2.12 mg/g at initial concentration of 100 mg/l, 8 g of dosage and contact time of 8 hours, respectively. Equilibrium data were well described by the Freundlich isotherm model. The positive values of DeltaS^o(kJ/mol.K) and DeltaH^o(kJ/mol) indicates the endothermic nature of the biosorption process and the spontaneous nature of the sorption of As(V) ion onto TW biomass was confirmed by negative value of DeltaG^o(kJ/mol). August - October 2011 Copyright © 2011 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=1711