Cd(II) Adsorption by Magnetic Clay Composite under the Ultrasound Irradiation

Abstract

The objective of this work is study of the adsorption properties of magnetic clay composite under the ultrasound irradiation. First, the structural properties of the composite were characterized by X-ray diffraction method and Mössbauer spectroscopy. For the adsorption experiments, cadmium, as a heavy metal ion, was selected. The adsorption has been studied by a batch method using an ultrasound device and rotary shaker. The composite adsorption properties have been tested under different conditions such as pH of the solution, contact time, initial metal ions concentration and temperature. The sonication markedly influenced the adsorption properties of composite, the increase of the maximum adsorption capacity (about 35 %) was observed in comparison with the conventional method. No evident effect of temperature on the adsorption capacity of composite was proved. The maximum adsorption capacity at 298 K, 323 K and 343 K, calculated from the linearized Langmuir model, was 96, 99 and 100 mg Cd 2+ g-1 , respectively.