Preparation Of Fe₂O₃/ZnO/g-C₃N₄ Catalyst And Performance Research On Phoyocatalytic Degradation Of Bisphenol A

As one of typical endocrine disruptor,BPA is widely used.It not only causes serious pollution to the environment,but also affects human health.Visible light catalytic technology has attracted wide attention because of its dual advantages in energy utilization and environmental governance,because of these advantages,it also becomes a research hotspot.One of the research cores of this technology is to prepare photocatalysts which can respond to visible light,have high reaction efficiency,and have stable structure and performance under various environmental conditions.Therefore,using the method of precipitation and calcination to prepare Fe₂O₃/ZnO/g-C₃N₄ photocatalyst with Z-type heterojunction structure in this paper.The visible light photocatalytic reaction system was established and BPA was taken as the main target pollutant to study the catalytic degradation performance of Fe₂O₃/ZnO/g-C₃N₄ under visible light.Fe₂O₃/ZnO/g-C₃N₄（FZCN）photocatalyst was prepared by a combination of precipitation and calcination..The optimal preparation conditions of FZCN are:the theoretical mass ratio of g-C₃N₄ to ZnO is 4,Fe/Zn of molar ratio is 10%,the calcination temperature is 550℃,and the calcination time is 2 h.Using XRD,SEM,XPS,FTIR,BET,UV-Vis DRS and other characterization methods comparative analysis of g-C₃N₄,Fe₂O₃/ZnO and FZCN.The experimental results pointed out that the g-C₃N₄ material was successfully prepared and zinc and iron were attached to the surface of g-C₃N₄ in the form of ZnO and Fe₂O₃.Compared with g-C₃N₄ and Fe₂O₃/ZnO,FZCN has a larger specific surface area（110.136 m²/g）,an excellent pore structure and an appropriate band gap（2.83 e V）.The optimal performance of FZCN catalytic performance for visible light conditions.Experimental results show that,under irradiation with visible light in the simulation,FZCN can completely remove BPA in water in 60 min,and the mineralization rate is about 30%.A quasi-first-order reaction kinetic model was used to fit the reaction process kinetics.The FZCN reaction rate(0.06867 min^-1)is 28 times that of pure g-C₃N₄(0.00242 min^-1).The material has good adaptability in the range of p H=5～10,and the coexisting ions will reduce the reaction rate.In order to explore the engineering application direction of FZCN,load it on the PVDF ultrafiltration membrane to prepare FZCN/PVDF photocatalytic membrane.The experimental results show that the removal rate of BPA by photocatalytic film（82%）is higher than that of PVDF film（47%）.The mechanism model of FZCN photocatalytic oxidation of BPA was proposed through the identification of active groups and the analysis of energy band structure.Finally,the intermediate products in the degradation process of BPA were analyzed by LC-QTOF-MS,and the degradation path of BPA was simply speculated.