Study of inorganic doping of kaolin clay, a kinetic study of adsorption of methyl green dye from its aqueous solutions

The presence of pollutants, including dyes, in water has destructive effects on both human and environment. Therefore, this study includes the removal of a cationic dye (methyl green) from water by both kaolinite clay (kao) mineral and its composite (kao/Al). The kaolinite clay (kao) mineral doping was carried out by alumina molecules in order to increase the adsorption quantity. The changes for kaolinite clay (kao) structure and its composite (kao/Al) were analyzed by XRD, FT-IR, and FESEM technieqes. The kinetic data were achieved by using two different kinetic models and the experimental data which were best fitted to the pseudo-second-order kinetic model. It was also found that the amount of adsorption enhances with increasing temperature to reach a value of 9.0646 mg/g for the surface (kao) and 16.3618 mg/g for (kao/Al), which indicated that the process nature is endothermic for both surfaces, in addition to that it revealed an improvement in the adsorption efficiency of the clay after the inorganic doping process.