In-TiO2@BiOBr@In-TCPP dual S-scheme heterojunction photocatalyst for enhanced photocatalytic H2S desulfurization: synthesis, performance and mechanism
The development of efficient photocatalysts for hydrogen sulfide (H 2 S) degradation under visible light remains a critical challenge due to constraints in light absorption efficiency and rapid electron-hole recombination. In this study, a novel dual S-scheme ternary heterojunction photocatalyst, In-TiO 2 @BiOBr@In-TCPP (IBP), was synthesized via a hydrothermal method for high-performance H 2 S desulfurization. Comprehensive characterization confirmed the successful formation of the heterostructure, where In-TiO 2 facilitated spontaneous H 2 S dissociation, BiOBr served as an efficient electron transport medium, and In-TCPP extended the light absorption spectrum to 1200 nm. The optimized IBP-3 demonstrated exceptional performance, achieving complete H 2 S degradation (100 %) within 120 min under visible light irradiation and retaining over 70 % efficiency even after 8 h of continuous operation. Mechanistic investigations revealed that the synergistic integration of In-TiO 2 , BiOBr, and In-TCPP enhanced visible light utilization, suppressed charge carrier recombination, and promoted reactive oxygen species (ROS) generation via internal electric fields (IEF) and S-scheme charge transfer pathways. This study not only presents the rational engineering of multi-component systems for designing advanced heterojunction photocatalysts to address industrial desulfurization challenges, but also emphasizes the potential of tailored heterostructures in advancing sustainable environmental remediation technologies.
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