BOUGAINVILLEA GLABRA LEAVES FOR ADSORPTION OF CONGO RED FROM WASTEWATER

In this manuscript, the removal of Congo Red (CR) from aqueous solution was investigated in batch mode using leaves powder of Bougainvillea glabra (BG) as a bioadsorbent. The influence of contact time, initial dye concentration, temperature and ionic strength on the removal of dye from aqueous solution was studied. The pseudo-first-order, pseudo-second Elovich and liquid film diffusion models were used to describe the kinetics of adsorption process. The experimental data fitted well to pseudo-second-order. The experimental data were analyzed by Langmuir, Freundlich, Dubinin-Radushkevich (D-R) and Temkin isotherms models. The adsorption data fitted well to the Freundlich isotherm. Thermodynamics study showed that the adsorption of CR onto leaves powder of BG was endothermic and spontaneous in nature.