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Carbon prepared from the epicarp of Ricinus communis was used to remove a textile dye (methylene blue (MB)) from an aqueous solution by adsorption technique under varying conditions of agitation time, dye concentration, adsorbent dose and pH. Adsorption depended on solution pH, dye concentration, carbon concen- tration and contact time. Adsorption followed both Langmuir and Freundlich isotherm models. The adsorption capacity was found to be 62.5 mg/g at a neutral pH of 7 for the adsorbent size of 125-250 m at room temperature (32 2 C). The kinetics of adsorption of MB obeys Pseudo-first order. The results in this study indicated that activated carbon from Ricinus communis was an attractive candidate for removing cationic dyes from the dye wastewater. communis, as an adsorbent for the removal of dyes from water. Annual production of Ricinus communis is estimated to be more than 1.0 tons globally, of which India accounts for 60% of the production. The epicarp of Ricinus is a segregated waste by-product (35% of production) during segregation of Ricinus Communis seed. Since the epicarp of Ricinus is available free of cost, only the carbonization of its involved for the wastewater treatment. Therefore the main objective of this study was to evaluate the possibility of using dried epicarp of Ricinus to develop a new low-cost activated carbon and study its application to remove methylene blue from simulated wastewater. The various parame- ters such as pH, adsorbent dose, initial dye concentra- tion, adsorbent particle size were investigated.

Removal of Methylene blue from aqueous solution by bioadsorption onto <i>Ricinus communis </i> epicarp Activated Carbon