Metal‐Organic Framework Templated Z‐Scheme ZnIn2S4/Bi2S3 Hierarchical Heterojunction for Photocatalytic H2O2 Production from Wastewater

Metal-organic framework derived materials received a lot of attention due to their significant benefits in photocatalytic reactions. In this work, a Z-scheme ZnIn₂S₄/Bi₂S₃ hierarchical heterojunction is first developed by a one-pot method using CAU-17 as a template. The specific preparation method endows an intimate interface contact between these two monomers, and CAU-17-derived Bi₂S₃ possesses a high surface area and porosity, resulting in an efficient charge separation and O₂ capture. Thus, for photocatalytic H₂O₂ production from the O₂ reduction reaction, the ZnIn₂S₄/Bi₂S₃ heterojunction can achieve an H₂O₂ yield of 995 µmol L^-1 in pure water and ambient air under visible light, 4.5 and 4 times that of ZnIn₂S₄ and Bi₂S₃, respectively. In addition, in tetracycline solution, ZnIn₂S₄/Bi₂S₃ can degrade tetracycline with a degradation rate of 95% by photocatalysis, and at the same time, a final H₂O₂ production yield of 1223 µmol L^-1 is reached. Similarly, high yields of H₂O₂ are also obtained from wastewater containing o-nitrophenol, acid golden yellow, or acid red, and these pollutants are effectively degraded. This work reveals the potential of metal-organic framework-derived materials in photocatalysis, as well as provides insights into H₂O₂ green synthesis and wastewater treatment.