Decolorization of Coomassie brilliant blue G-250 dye using snail shell powder by action of adsorption processes

The adsorption of CBB G-250 dye on snail shell powder was investigated in adsorption process. The effects of PH, contact time, temperature and adsorbent dose were evaluated. The maximum adsorption of CBBG-250 was achieved where the removal ratio was 86.3% at the optimum initial dye concentration 20.000mg/L, the absorbent material weight 0.02g and the contact time 30 min. The balance of adsorption and kinetics was found for Freundlich, Langmuir and Temkinisotherm. Thermal dynamics of the adsorption process?H, ?G and ?S were found exothermal, spontaneous, and decrease in randomness at the solid/solution interface.