Lead‐Free Perovskite Cs 3 Bi 2 Br 9 /Bi 19 Br 3 S 27 Heterojunction for Highly Efficient Synergistic CO 2 Photoreduction and Oxytetracycline Decomposition

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Building a dual‐function catalytic system through photocatalysis that simultaneously enables efficient antibiotic degradation and highly selective CO 2 reduction was considered one of the cutting‐edge strategies for synergistically alleviating environmental pollution and the energy crisis. This study constructs a lead‐free perovskite Cs 3 Bi 2 Br 9 /Bi 19 Br 3 S 27 heterojunction photocatalytic system, achieving the synergistic conversion of CO 2 reduction and oxytetracycline hydrochloride (OTC‐HCl) antibiotic degradation. The optimized composite catalyst exhibits excellent performance, with a CO generation rate of 155.2 µmol g −1 h −1 and an OTC‐HCl degradation efficiency of about 92% ( k = 0.03937 min −1 ), and was significantly superior to the performance of a single component. This is mainly attributed to the formation of heterostructure interfaces, which significantly enhances the separation and migration efficiency of photogenerated charge carriers, thereby simultaneously promoting reduction and oxidation processes. In this system, pollutants act as sacrificial agents, not only effectively consuming holes and suppressing charge carrier recombination, but also further accelerating the CO 2 reduction process by serving as electron donors. This study provides a new approach for constructing efficient bifunctional photocatalytic systems and shows significant application potential in environmental remediation and carbon resource utilization.