Chromium is a dietary requirement for many organisms. It applies only for a trivalent chromium but not hexavalent chromium. Hexavalent chromium is very toxic to flora and fauna. Discharging the untreated chromium waste water in rivers causes environmental disasters. Taking that factor into consideration, the present study investigates the possibility of controlling Cr (VI) by using Eleusine coracana (Ragi) seed powder by using adsorption process. The experimental study carried out with respect

more »

... o effect of contact time, concentration, adsorbent dosage, pH of the solution and temperature of the medium. The studies were proved that the adsorption efficiency is increase with increase in contact time, initial chromium concentration and adsorbent dosage. The maximum adsorption of chromium is observed at pH 7. The adsorption efficiency decreased with increase in temperature. The experimental data were tested with adsorption kinetic and adsorption isotherm models and from that it is concluded that adsorption of chromium by Eleusine coracana powder as an adsorbent can be described by pseudo first order kinetic model and isotherm studies revels that adsorption of chromium is perfectly fitted with Temkin and Freundlich adsorption isotherm models.