2014 Volume 12 Issue 1 Pages 13-23
In the present study, GB400 was prepared by calcination of gibbsite (GB) at 400°C. The properties of GB and GB400 were investigated and the adsorption of cisplatin onto GB400 was evaluated. The scanning electron microscopy images were obtained and specific surface area, mean pore diameter, pore volume, number of hydroxyl groups, and the solution pH were measured. The observed values for GB400 were superior to those of GB. The optimal pH condition for adsorption of cisplatin using GB400 was about 8. Equilibrium adsorption of cisplatin onto GB400 was reached within 24 h. These experimental data were fitted to the pseudo-second-order equation. Moreover, the amount of cisplatin adsorbed onto GB400 was increased proportionally with temperature. The experimental data were fitted to the Langmuir equation model. The ΔG values were less than -80 kJ/mol, which indicate that the adsorption mechanism of cisplatin onto GB400 is related to chemisorption. The ΔH values were negative, indicating that the adsorption of cisplatin onto GB400 is exothermic. The positive values of ΔS signify an irregular increase of the randomness at the GB400/solution interface during the adsorption process. Cisplatin adsorbed onto GB400 was desorbed using hydrochloric acid solution.
