Adsorption studies of chromium (VI) on activated carbon derived from Sorghum vulgare (dried stem of Jowar).

Abstract

The present work deals with the adsorption studies of chromium (VI) on activated carbon derived from Sorghum vulgare (dried stem of Jowar). The activated carbons were prepared by physical and chemical activation using H2SO4, H3PO4 activating agents of different imprignation Ratio (I.R.). The effect of adsorption of Cr (VI) on pH, particle size concentration, contact time and dosage have been studied. Removal of chromium (VI) attained in equilibrium maxium of 50 minutes and slightly decreases with increasing I.R. Adsorption obeys first order rate equation and Webber and Morris equation for pore diffusion. Adsorption increases with decrease in pH, is maximum at pH 2. Increase in imprignation ratio also increases surface area of Sorghum vulgare carbons.