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The pursuit of robust photocatalysts that can completely degrade organic contaminants with high performance as well as high energy efficiency, simplicity in preparation, and low cost is an appealing topic that potentially promotes photocatalysts for being used widely. Herein, we introduce a new and efficient SnO 2 /Bi 2 S 3 /BiOCl-Bi 24 O 31 Cl 10 (SnO 2 /Bi 2 S 3 -Bi25) composite photocatalyst by taking advantage of the robust, simple, and potentially scalable one-pot synthesis, including the hydrothermal process followed by thermal decomposition. Interestingly, we observed the formation of BiOCl-Bi 24 O 31 Cl 10 (abbreviated as Bi25) heterojunctions derived from reactions between Bi 2 S 3 and SnCl 4 ·5H 2 O precursor solutions under the hydrothermal condition and thermal decomposition of BiOCl. This Bi25 heterojunction acts as an interface to reduce the recombination of photogenerated electron-hole (e - -h + ) pairs as well as to massively enhance the visible light harvesting, thereby significantly enhancing the photocatalytic degradation performance of the as-prepared composite photocatalyst. In detail, the photocatalytic degradation of Rhodamine B (RhB) activated by visible light using 15% SnO 2 /Bi 2 S 3 -Bi25 shows the efficiency of 80.8%, which is superior compared to that of pure Bi 2 S 3 (29.4%) and SnO 2 (0.1%). The SnO 2 /Bi 2 S 3 -Bi25 composite photocatalyst also presents an excellent photostability and easy recovery from dye for recycling. The trapping test revealed that the photogenerated holes play a crucial factor during the photocatalytic process, whereas superoxide radicals are also formed but not involved in the photocatalytic process. Successful fabrication of SnO 2 /Bi 2 S 3 -Bi25 composite photocatalysts via a straightforward method with drastically enhanced photocatalytic performance under visible light activation would be useful for practical applications.

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Straightforward Synthesis of SnO2/Bi2S3/BiOCl–Bi24O31Cl10 Composites for Drastically Enhancing Rhodamine B Photocatalytic Degradation under Visible Light