作者：W. Li,* J. Li, T. Ma, G. Liao, F. Gao, W. Duan, K. Luo, C. Wang*
关键字：chromium-containing wastewater, heterojunction, near-infrared light, solar photovoltaic technology, transition metal sulfides
论文来源：期刊
具体来源：https://doi.org/10.1002/smll.202302737
发表时间：2023年

How to collaboratively reduce Cr(VI) and break Cr(III) complexes is a technical challenge to solve chromium-containing wastewater (CCW) pollution. Solar photovoltaic (SPV) technology based on semiconductor materials is a potential strategy to solve this issue. Sb₂S₃ is a typical semiconductor material with total visible-light harvesting capacity, but its large-sized structure highly aggravates disordered photoexciton migration, accelerating the recombination kinetics and resulting low-efficient photon utilization. Herein, the uniform mesoporous CdS shell was in-situ formed on the surface of Sb₂S₃ nanorods (NRs) to construct the core-shell Sb₂S₃@CdS heterojunction with high BET surface area and excellent near-infrared light harvesting capacity via a surface cationic displacement strategy, and density functional theory (DFT) thermodynamically explained the breaking of Sb-S bonds and formation of Cd-S bonds according to the bond energy calculation. The Sb-S-Cd bonding interaction and van der Waals force significantly enhanced the stability and synergy of Sb₂S₃/CdS heterointerface throughout the entire surface of Sb₂S₃ NRs, promoting the Sb₂S₃-to-CdS electron transfer due to the formation of built-in electric field. Therefore, the optimized Sb₂S₃@CdS catalyst achieved highly enhanced simulated sunlight-driven Cr(VI) reduction (0.154 min^-1) and decomplexation of complexed Cr(III) in weakly acidic condition, resulting effective CCW treatment under co-action of photoexcited electrons and active radicals. This study provides a high-performance heterostructured catalyst for effective CCW treatment by SPV technology.