Self-assembled nanorods/nanowires of CdS were successfully synthesized by a solvothermal method at 200 oC for 5, 10 and 20 h using sodium dodecylsulfonate as a capping reagent. X-ray diffraction (XRD) patterns of all CdS samples can be indexed to pure phase of hexagonal CdS structure. The degree of crystallinity of CdS was increased with the increase of holding reaction time from 5 h to 20 h. Transmission electron microscopic (TEM) images revealed that the product synthesized by the solvothermal method at 200 oC for 20 h contained self-assembled flower-like CdS nanostructure. The UV-visible absorption of self-assembled flower-like CdS nanostructure shows excellent absorption in UV-visible region with the absorption peak at 481 nm. Photocatalytic efficiency of the as-prepared CdS samples was investigated through rhodamine B (RhB) degradation under visible light irradiation. In this research, the self-assembled flowerlike CdS nanostructure has the highest degradation of 94.91 % within 80 min.

Heterostructure Ag/AgCl/Bi2MoO6 nanocomposites as visible-light-driven photocatalyst for rhodamine B (RhB) degradation were prepared by precipitation and sonochemical-assisted deposition method. The phase, morphology, oxidation state of element and optical properties of heterostructure Ag/AgCl/Bi2MoO6 nanocomposites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and UV-visible spectroscopy. In this research, the pure sample prepared by simple hydrothermal method was orthorhombic phase of Bi2MoO6 nanoplates with smooth surfaces. Upon being loaded with Ag/AgCl by sonochemical-assisted deposition method, AgCl and Ag nanoparticles were deposited on the surface of Bi2MoO6 nanoplates. The UV-visible spectra of Ag/AgCl/Bi2MoO6 nanocomposites show visible light absorption higher than pure Bi2MoO6 nanoplates. The enhanced photocatalytic efficiency of Ag/AgCl/Bi2MoO6 nanocomposites was investigated through rhodamine B (RhB) degradation under visible light irradiation and compared with those of the Bi2MoO6 nanoplates and AgCl/Bi2MoO6 nanocomposites. The photocatalytic efficiency of heterostructure Ag/AgCl/Bi2MoO6 nanocomposites in degrading RhB under visible light irradiation is higher than those of Bi2MoO6 nanoplates and AgCl/Bi2MoO6 nanocomposites. The photocatalytic efficiency of Ag/AgCl/Bi2MoO6 nanocomposites in degrading RhB is 99.70% under visible light irradiation within 30 min.