Abstract
Monodisperse CuS/ZnS nanocomposite hollow spheres with diameters of about 255 nm and shells composed of nanoparticles have been successfully synthesized in high yield by an ion-exchange method using monodisperse ZnS solid spheres as a precursor. The prepared samples were characterized by X-ray diffraction, scanning and transmission electron microscopy, X-ray photoelectron spectroscopy, N2 adsorption−desorption isotherms, and UV−visible absorption spectroscopy. The photocatalytic activity was evaluated by the photocatalytic decolorization of Rhodamine B (RhB) aqueous solution under visible-light irradiation. The results indicate that the difference of solubility products (Ksp) of ZnS and CuS is the main driving force for the formation of CuS/ZnS hollow spheres. A sequential evolution process involving surface deposition, mutual diffusion, interior dissolution, and interfacial reaction is proposed to account for the formation of CuS/ZnS nanocomposite hollow spheres. The reaction time greatly influences the ...
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