Study On Wide Spectrum Thin Film Phoyocatalyst Modified By MoS₂ & Electrochemical Method And Its Photoelectr C Properties

Environmental pollution has become more and more serious with the industrialization and population growth.A large amount of domestic sewage and industrial wastewater are discharged into natural water environment.Among them,refractory organic pollutants pose a great threat to ecological environment and human health.Traditional water treatment technologies are not efficient and require environmentally friendly technologies.Photoelectrocatalysis,as a green and efficient advanced oxidation technology,can efficiently treat organic pollutants.We focus on the preparation of photocatalytic films and their properties.The E-Fe2O3-Pi-MoS2 film was prepared by electrodeposition,hydrothermal and electrochemical modification methods.The effects of phosphorus,MoS2 and electrochemical modification on Fe2O3 film were obtained by XRD,XPS,SEM and UV-vis analysis.According to the data of LSV,M-S,EIS and IPCE,the photocurrent of E-Fe2O3-Pi-MoS2 film is obviously higher than that of Fe2O3 film,which is 30 times and 19.4 times of Fe2O3 film under-visible light and UV-visible light,respectively.It has better oxidative ability,smaller interfacial charge transfer resistance,higher hole utilization and photoelectric conversion efficiency.These modification methods effectively solve the problem of photogenerated hole-electron recombination in Fe2O3 and make the composite film have better photoelectrocatalytic activity.The as-prepared E-Fe2O3-Pi-MoS2,Fe2O3-Pi-MoS2,Pi-Fe2O3 and Fe2O3 film were applied to the degradation of phenol simulated wastewater.The results show that E-Fe2O3-Pi-MoS2 film has the best degradation efficiency on simulated phenol wastewater under photoelectrocatalysis,bias voltage 2.5 V,acidic or neutral phenol wastewater.It is suitable for the treatment of low concentration phenol wastewater and has good stability.The main active ingredients were O2·-and HO· during the degradation process.The E-BiVO4-MoS2-Co3O4 film electrode was synthesized by hydrothermal,electrodeposition,and calcination.MoS2 and Co3O4 were deposited on BiVO4 film and electrochemical modification further improved the photocatalytic activity.Photoelectrochemical characterization data show that E-BiVO4-MoS2-Co3O4 film has better photocurrent,lower charge transfer resistance,higher photoelectric conversion efficiency and inhibiting recombination of photogenerated hole-electron pairs.The degradation of Bisphenol A(BPA)simulated wastewater was studied using E-BiVO4-MoS2-Co3O4 film.The degradation of applied bias voltage,catalytic types,different pH,different phenol concentrations were investigated.The results show that the E-BiVO4-MoS2-Co3O4 film has the best degradation and kinetic data on simulated BPA wastewater under photoelectrocatalysis,acidic and alkaline wastewater.E-BiVO4-MoS2-Co3O4 film has good reusability(25 h).The main active ingredients are O2·-and h+ during the BPA degradation process.