Kinetic studies on adsorption of chromium by coconut shell carbons from synthetic effluents

Abstract
The present work deals with the kinetics of chromium (vi) removal from prepared activated coconut shell carbons. The activated carbons were prepared by physical and chemical activation using H2SO4, H3PO4, ZnCl2 activating agents of different Imprignation Ratio (IR). The effect of adsorption of Cr (vi) on pH, particle size concentration, contact time have been studied. Removal of cromium (vi) attained an equilibrium maximum of 70 mins. and slightly decreases with increasing IR. Adsorption obeys First order rate equation and Webber and Morris equation for pore diffusion. Adsorption increases with decrease in pH, is maximum at pH 1. Increase in imprignation ratio also increses surface area of coconut shell carbons.