Adsorption Studies of Congo Red from Aqueous Solution on to Rice Husk.

Adsorption is of significant importance for the effluent treatment, especially for the treatment of colored effluent generated from the dyeing and bleaching industries. Low cost adsorbents have gained attention over the decades as a means of achieving very high removal efficiencies to meet discharge standards. The present paper reports on batch investigations for color removal from aqueous solutions of Congo red (CR) using Rice Husk (RH) as an alternative low cost adsorbent. The performance analysis was carried out as function of various operating parameters, such as initial concentration of dye, adsorbent dose, contact time, particle size of adsorbent and P H . Performance studies revealed that a very high percentage removal of color was achievable. Detailed data analysis indicated that the adsorption of CR followed Freundlich isotherm and Langmuir isotherm.