Department of Studies in Environmental Science, University of Mysore, Manasagangotri, Mysore-570 006. Karnataka, India.
*Corresponding author E-mail address: envimys2009@yahoo.com
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The biosorption of Cr(VI) from aqueous solution by potato peel waste has been investigated in a batch biosorption system as a function of pH, contact time, adsorbent dosage and initial concentration of Cr(VI). The process was pH dependent and complete removal of Cr(VI) was obtained at pH < 3.0. The mechanism that governs complete removal of Cr(VI) by potato peel waste was sorption coupled reduction. The equilibrium data could be well interpreted by Langmuir isotherm model. The sorption rate was found to be dependent on the initial concentration of Cr(VI) and biomaterials dosage. The kinetic data was well described by pseudo-second-order kinetic model. The results of the study showed that the potato peel waste can be efficiently used as low cost alternative for the removal of Cr(VI) from polluted wastewaters.
biosorption, Cr(VI), potato peel, adsorption isotherm, adsorption kinetic
