Sonochemical synthesis and characterization of CdS/ZnS core-shell nanoparticles and application in removal of heavy metals from aqueous solution

摘要

In the present work, CdS/ZnS core-shell nanoparticles have been successfully synthesized with the aid of Cd(NO_3)_2 and Zn(NO_3)_2· 6H_2O as the starting reagents in presence of ultrasonic irradiation. Besides, the effects of preparation parameters such as ultrasonic power, irradiation time and precursor concentration on the morphology CdS/ZnS core-shell nanoparticles and removal of heavy metals (Hg~(2+), Pb~(2+)) were studied by SEM images and batch adsorption mode. The as-synthesized products were characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution field-emission transmission electron microscope (HRTEM), photoluminescence spectroscopy (PL), scanning electronic microscopy (SEM), spectra energy dispersive analysis of X-ray (EDS) and ultraviolet-visible (UV-Vis) techniques.