Effect of cationic and anionic dye adsorption from aqueous solution by using chemically modified papaya seed

Abstract-Papaya seed (PS) was modified using chemically esterification of carboxyl group to improve performance in adsorption capacity for removal cationic and anionic dye from aquoues solution. The operation parameters investigated included initial concentrations, (50-500 mg/L) and various adsorbent (NPS and EPS). The experimental data were analyzed by using Langmuir and Freundlich models of adsorption. The adsorption isotherm data for MB were best fitted to the Langmuir isotherm and the maximum monolayer adsorption capacity was found to be 250.00 mg/g and 200.00 mg/g at 30°C for EPS and NPS respectively, while for CR for both adsorbents (NPS and EPS) the best fit experimental data were Freundlich isotherm. The adsorption kinetics can be predicted by the pseudo-first order and pseudo-second order.The experiment data were obeys pseudo-second order with higher coefficient of correlation R 2 ≥ 0.99. The result revealed that NPS can be act as good adsorbent for removal anionic dye (CR) and EPS can be remarkable as excellent adsorbent modified of PS for cationic dye removal