CdS/ZnSnO₃ Hollow Core–Shell Nanocubes for Photocatalytic Hydrogen Evolution and Degradation of Ciprofloxacin

Abstract

The Sn 2+ ion self-doping CdS/ZnSnO 3 hollow core−shell cubic heterojunction photocatalyst is fabricated via an approach of hybrid coprecipitation-annealing-reduction-chemical method. As reported, the as-prepared CdS/Sn 2+ −ZnSnO 3 heterojunction exhibits prominent enhanced photocatalytic hydrogen evolution reaction (HER, ∼5218.71 μmol•g −1 •h −1 , Na 2 S + Na 2 SO 3 sacrificial agent) and degradation than that of ZnSnO 3 (∼120/8.3folds) and CdS (∼50/5.2-folds). There, the CdS/Sn 2+ -ZSO with a greater potential gradient can promote the carrier separation; CdS with a higher absorption can increase the visible-light response; and the Sn 2+ /O v with a shallow donor level can regulate the potential structure, increase the intrinsic carrier injection, and promote the carrier transportation. All of these can optimize the carrier efficiency effectively, including increasing the transportation, prolonging the lifetime, and decreasing the recombination. In addition, the CdS nanoshell can provide vast active sites and the hollow cubic structure with large internal cavities can enhance the solar efficiency, while retaining good stability during photocatalysis.

Constructing hollow core–shell Z-scheme heterojunction CdS@CoTiO3 nanorods for enhancing the photocatalytic degradation of 2,4-DCP and TC

“…It is noteworthy that forming core–shell structures with distinct boundaries can not only provide larger active interfaces between the constituent materials by multiple directional contact, but also produce new synergetic effects owing to the ranges of physical and chemical properties of the core and shell influenced by their compositions, structures, and dimensions, making them attractive for applications in catalysis. 24,25 For example, Zhu et al 26 prepared a Sn 2+ -ion self-doping CdS/ZnSnO 3 hollow core–shell cubic heterojunction photocatalyst, which demonstrated significantly improved photocatalytic activity for the hydrogen evolution reaction and for ciprofloxacin degradation under visible-light irradiation.…”