Lead-free perovskite Cs3Bi2Br9/TiO2 composites for atmospheric photocatalytic oxidation of sulfides

Abstract

Photocatalytic selective oxidation represents an eco-friendly strategy for chemical transformation. Herein, a lead-free halide perovskite Cs₃Bi₂Br₉ combined with TiO₂ was facilely synthesized and applied for efficient photocatalytic selective oxidation of sulfides to sulfoxides with high yields and good compatibility under mild conditions. The Cs₃Bi₂Br₉/TiO₂ composite exhibited enhanced photocatalytic activity compared to bare Cs₃Bi₂Br₉ particles, which could be ascribed to the strong interaction between Cs₃Bi₂Br₉ NCs and TiO₂ markedly accelerating the separation and transfer efficiency of photogenerated electron–hole pairs and simultaneously suppressing their recombination.