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Adsorption of cadmium (II) by using clays modified with ultrasound

The aim of this study is to investigate the Cd(II) adsorption from aqueous solutions with raw and ultrasound clay samples. In the batch experiments, effect of the some parameters such as contact time, pH levels, temperature, stirring rate on the adsorption were investigated. Brunauer-Emmett-Teller (BET) surface area of the clay samples increased from 28.5 m2/g to 52.7 m2/g result of ultrasound modification. Adsorption systems were best described with pseudo second order kinetic model and Langmuir isotherm. It was determined that the maximum adsorption capacity of the ultrasound modified clay samples is higher compared to raw clay samples. It was determined that the optimum pH value is 6, and the optimum stirring speed is 250 rpm for the adsorption. Adsorption for modified and raw clay samples increased significantly with increasing system temperature which revealed the endothermic nature of the adsorption.