The Dual Z‐Scheme Photocatalyst Bi2O3/Ag2S/AgFeO2 Interfacial Structure for the Efficient Degradation of Organic Pollutants

Abstract In this article, the Bi 2 O 3 /Ag 2 S/AgFeO 2 (BO/AS/AFO) ternary heterojunction photocatalyst was prepared by two steps synthesis method. The materials have been gained by anchoring AFO nanoparticles and AS nanosheets on the surface of BO microrods with the aim of synergistically enhancing the photocatalytic efficiency for tetracycline hydrochloride (TC). First, we constructed the Bi 2 O 3 /Ag 2 S (BO/AS) heterojunction, finding that the photocatalyst of BO/AS‐20 sample shows the optimal photoreduction rate within 60 min toward TC, which is 65.87%, and improved by 2.4 and 1.9 times over that of pure BO and AS composites, respectively. Subsequently, we have modified the AFO nanoparticles (NPs) on the surface of BO/AS‐20. The experimental results revealed that photocatalytic results were best when the AFO ratio was 15%, and improved by 1.4 times over BO/AS‐20. The ternary heterostructures BO/AS/AFO‐15 obviously further increased photocatalytic performance. This phenomenon originates from the influence of interface field and the improved the rate of carrier separation in BO/AS/AFO. The optical properties and crystal structures of our as prepared samples have been characterized by XRD, SEM, TEM, and so on. A possible photocatalytic mechanism was proposed and analyzed, accompanied by theoretical studies also have been conducted by density functional theory (DFT) and finite element method (FEM).