The construction of organic-inorganic semiconductor heterojunctions is an important way to improve the photocatalytic performance of semiconductors and inhibit the recombination of photogenerated charge carriers. In this paper, a novel Sb₂S₃-3,4,9,10-perylene tetracarboxylic acid (Sb2S3-PTCA) heterojunction was prepared by hydrothermal method. Compared with Sb2S3 and PTCA, Sb2S3-PTCA composite catalyst had better photocatalytic reduction ability for Cr(VI) in aqueous solution under visible light conditions. The optimized Sb2S3-1.0 wt.% PTCA heterostructures exhibited significantly enhanced photocatalytic activity compared to pure Sb₂S₃ and PTAC, achieving a complete Cr(VI) reduction rate of 100% in just 50 min. This will lead to cleaner effluent water being discharged into the environment, thereby reducing pollution and protecting aquatic ecosystems. The enhanced photocatalytic efficacy exhibited by the Sb2S3-PTCA heterostructure stems from the creation of a type II heterojunction, which facilitates a more proficient dissociation and transportation of the electron-hole pairs, thus contributing to its superior performance.
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