Scalable low temperature in air solid phase synthesis of porous flower-like hierarchical nanostructure SnS 2 with superior performance in the adsorption and photocatalytic reduction of aqueous Cr(VI)

摘要

Highlights?Scalable in air solid phase synthesis of pure SnS2(F-SnS2) at 170°C.?F-SnS2has nanosheets-constructed porous flower-like hierarchical nanostructure.?F-SnS2showed more adsorption and faster photocatalytic reduction of aqueous Cr(VI).?Reasons for the superior performance of F-SnS2were proposed.?Effects of dosage of catalyst, pH and concentration of Cr(VI) solution were studied.AbstractNanosheets-constructed porous flower-like hierarchical nanostructure SnS2(which was labeled as F-SnS2) was synthesized by heating the mixture of SnCl2·2H2O and thiourea in air at 170°C for 2h, in combination with a subsequent washing with water. F-SnS2exhibited much more adsorption and faster visible-light (wavelength >420nm)-irradiated photocatalytic reduction of aqueous Cr(VI), as compared with SnS2nanoparticles, nanoplates-assembled flowerlike hierarchical structure SnS2synthesized by hydrothermal method, Fe, N and C tri-doped TiO2, and hydrothermally treated g-C3N4. The underlying reasons for the far superior performance of F-SnS2were proposed, based on the comparison of the microstructure, specific surface area, optical, electrochemical impedance, photocurrent, surface charge, and Cr(VI) adsorption properties of F-SnS2and SnS2nanoparticles. Besides, the photocatalytic reusability and stability of F-SnS2, as well as the effects of photocatalytic testing parameters (including dosage of photocatalyst, initial pH and concentration of K2Cr2O7aqueous solution) on the Cr(VI) removal efficiency by F-SnS2were also studied. This work may advance our knowledge on the scalable low temperature solid phase synthesis of SnS2nanomaterial, and contribute to the application of SnS2in treating the Cr(VI)-polluted water.]]>