O-ZnIn₂S₄/BP 光催化剂的制备及降解四环素研究

The excessive use and random discharge of antibiotics have caused serious pollution to the water environment. Photocatalytic degradation technology is an economical and effective method to treat antibiotic wastewater. The design and synthesis of highly efficient photocatalytic materials is the key to the practical application of this technology. As a typical cationic alloy semiconductor, layered ZnIn₂S₄ (ZIS) not only has a narrow band gap and can effectively absorb visible light, but also has a high flat band potential and stable chemical properties, which makes layered ZIS become a visible light catalytic material with great application prospect. However, ZIS material has the disadvantage of low photogenerated carrier separation efficiency, which limits the practical application of ZIS. In this study, oxygen doped ZnIn₂S₄ (O-ZIS) and black phosphorus (BP) nanosheet were combined by a mild two-step method to prepare a composite photocatalyst (O-ZIS/BP). Under visible light irradiation, the highly efficient degradation of pollutant tetracycline (TC) was achieved. The recombination of BP can significantly enhance the electron migration rate in photocurrent response. When the recombination amount of BP reaches 0.5%, the best activity is achieved with TC degradation rate of 90% and TOC removal of 64.5% under 20 min of light. ·O₂⁻ and ·OH radicals play an important role in O-ZIS /BP photocatalytic TC degradation. This study will provide a new idea for the development of two-dimensional nanosheet composite photocatalyst and its application in environmental remediation.