Fast Removal of Malachite Green by Adsorption on Rice Husk Activated Carbon

Application of activated carbon developed from rice husk, an agricultural waste product has been investigated for the removal of malachite green from aqueous solutions and wastewaters. Batch adsorption experiments were carried out for the removal of malachite green from aqueous solutions onto rice husk activated carbon. Effect of important parameters namely initial concentration of dye and contact time, and temperature was studied on removal of the dye. The removal increased from 93.75 to 94.91% by decreasing the initial concentration from 100 to 60 mg/l. Equilibrium data were fitted to Freundlich and Langmuir isotherm equations and the isotherm constants were determined. The monolayer adsorption capacity of rice husk activated carbon for adsorption of the dye was found to be 63.85 mg/g at room temperature.