▎ 摘　　要

Dibismuthoxysulfide (Bi2O2S) is considered as a promising photocatalyst candidate due to its high photo -response and strong reduction ability. However, high photo-induced charge recombination rate has restricted its photocatalytic activity. Here, we have successfully fabricated a Bi2O2S-based Z-scheme nanocomposite, a-Fe2O3/graphene/Bi2O2S(a-Fe2O3/GR/Bi2O2S), for highly active and stable visible-light-driven catalytic CO2 conversion with addition of water vapor. By creating large interfacial contact, efficient Z-scheme electron migrate from a-Fe2O3 to Bi2O2S is established, resulting in boosted charge carriers separation as well as lengthen their lifetimes, as systematically evidenced by photoluminescence (PL) spectra, photoelectrochemical charac-terization and electron spin resonance (ESR). As a consequence, such a-Fe2O3/GR/Bi2O2S heterojunction ach-ieved the highest yields of CO(13.00 mu mol/g/h), CH4(4.27 mu mol/g/h) and C2H4(2.88 mu mol/g/h) under visible light irradiation, which is approximately 5.4, 12.5 and 16.9 times that of Bi2O2S, respectively. Meanwhile, the a-Fe2O3/GR/Bi2O2S heterojunction exhibited outstanding photocatalytic activity for bisphenol A (BPA) removal in contrast with Bi2O2S. This study provides a viable strategy to build effective Bi2O2S-based Z-scheme nano -composite for CO2 conversion and beyond.