Spherical Ag8SnS6 nanoparticles degrades eosin yellow within 45 min under solar irradiation and brilliant green within 90 min under tungsten lamp irradiation. Superoxide anions are the main active species involved in photodegradation of eosin yellow and brilliant green dyes.

SnS (tin sulfide) quantum dots (QDs) were synthesized by a chemical coprecipitation method using ethylene glycol as a solvent and capping agent and thiourea as a sulfur source at a temperature of 160 °C, 4 h.

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BiOBr-Ag 8 SnS 6 heterostructured nanocomposite photocatalysts have been synthesized by chemical coprecipitation method in the presence of ethylene glycol solvent at a temperature of 100°C for 4 hr. The synthesized BiOBr-Ag 8 SnS 6 heterostructured composites were characterized by X-ray diffraction, transmission electron microscopy, ultraviolet-visible near-infrared spectroscopy, photoluminescence spectroscopy, and Brunauer-Emmett-Teller surface area measurement. X-ray diffraction pattern of BiOBr-Ag 8 SnS 6 heterostructures showed the peaks corresponding to tetragonal structure of BiOBr and orthorhombic structure of Ag 8 SnS 6 nanoparticles, which indicated that they exist in biphasic form in the composite. Photoluminescence studies showed that the BiOBr-Ag 8 SnS 6 -1 composite possesses the lowest recombination rate of e − -h + pairs. Brunauer-Emmett-Teller surface area of BiOBr, Ag 8 SnS 6 nanoparticles, BiOBr-Ag 8 SnS 6 -1, and BiOBr-Ag 8 SnS 6 -2 was found to be 0.05, 2.35, 1.88, and 1.0 m 2 /g, respectively. BiOBr-Ag 8 SnS 6 heterostructured nanocomposite photocatalysts exhibited robust photodegradation towards degradation of indigo carmine dye than that of single-phase BiOBr and Ag 8 SnS 6 nanoparticles under sunlight irradiation. The enhanced photoactivity could be ascribed to heterostructure effect between BiOBr and Ag 8 SnS 6 nanoparticles, an improved visible light absorption and the separation and easy transfer of photogenerated electrons and holes, across the interface of BiOBr-Ag 8 SnS 6 . The radical scavenger experiments showed that photogenerated holes and superoxide radicals were the main active species involved in the photodegradation process of indigo carmine.

We have synthesized novel BiOCl-CoWO 4 heterostructured nanocomposites through chemical precipitation route with different amount of CoWO 4 using KCl as Cl source at a temperature of 100°C, 4 hours. X-ray diffraction, transmission electron microscopy, UV-visible NIR spectroscopy, photoluminescence spectroscopy, N 2 adsorption-desorption isotherms, and electrochemical impedance spectroscopy were performed to gain the crystal structure, morphology, optical properties, surface area, and charge separation of the prepared photocatalysts. BiOCl-CoWO 4 composites demonstrated the diffraction peaks of both monoclinic CoWO 4 nanoparticles and tetragonal BiOCl indicating the formation of the nanocomposite. TEM observations have shown that CoWO 4 nanoparticles were deposited on the BiOCl surface. Photoluminescence, fluorescence lifetime study, and Electrochemical impedance spectroscopy responses of materials indicated a good separation efficiency of charge carriers in BiOCl-CoWO 4 -1. The photodegradation efficiency of the prepared materials was assessed by the decomposition of rhodamine B (RhB) dye solution under sunlight irradiation. Among the synthesized materials, the BiOCl-CoWO 4 -1 composite photocatalyst exhibited maximum photocatalytic activity. Thus the resulting heterostructure favored the efficient charge and energy transfer between BiOCl and CoWO 4 nanoparticles across the interface. The investigations from the radical scavenger tests showed that photogenerated h + , O 2 •− , and • OH radicals were involved in the photodegradation of RhB.