Comparative Studies for the Adsorption of Remazol Blue on Rice Husk, Saw Dust and Charcoal

Rice husk and saw dust are attempted as alternate adsorbents to charcoal for the removal of reactive dye, namely remazol brilliant blue from aqueous media. The adsorption of remazol brilliant blue has been studied onto rice husk, saw dust and charcoal at different shaking times, adsorbent dosage, temperatures and pH values and their results are compared. The adsorption data was fitted to Freundlich and Langmuir isotherms and corresponding adsorption parameters for each were calculated. Pseudo first and second order kinetic models were used to calculate the amount adsorbed at equilibrium (q(e)). The calculated values of q(e) for pseudo-second order equation were found to be in good agreement with those of experimental values. The monolayer capacity (V-m) for rice husk (0.699 mg g(-1)) is greater than that for charcoal (0.074 mg g(-1)) and saw dust (0.114 mg g(-1)). It is concluded that rice husk is found better adsorbent for the removal of remazol brilliant blue as compared to charcoal and saw dust.