Preparation Of BiO_2-x Based Composite Semiconductor Photocatalyst And Study On Its Photocatalytic Degradation Performance

Solar-based semiconductor photocatalytic technology has both solved the two problems of energy shortage and environmental pollution.Because of its environmental friendly and resource-saving advantages,it has become a research hotspot in the fields of energy conversion and environmental governance.Along with the large-scale industrial expansion,the discharge of industrial wastewater containing poorly biodegradable organic compounds containing polycyclic aromatic hydrocarbons and phenols has been increasing.Advanced oxidation technology is currently the most popular industrial wastewater advanced treatment technology.The strong oxidation produced by the reaction free radical can mineralize the refractory organic pollutants directly or increase the biodegradability of the pollutants by oxidation to facilitate the traditional treatment.The photocatalytic oxidation method uses sunlight as a starting energy,and relies on a photocatalytic reaction of a catalyst readily available in the industry to degrade organic matter.Compared with other advanced oxidation methods,it has the advantages of environmental protection,high efficiency and low cost,and is expected to be widely used in the future.Therefore,it is the research focus of current photocatalytic technology to find low-cost and high-efficiency photocatalysts or to improve the activity of the catalysts through modification.Based on BiO2-x photocatalysts rich in oxygen vacancies,this paper improves the catalytic performance and recyclability through the recombination of W ion doping and reduction of graphene oxide(RGO)aerogels.The specific research content is as follows:(1)Hydrothermal method was used to prepare WBO composite photocatalysts with different proportions.The samples were characterized and analyzed using XRD,UV-Vis DRS,SEM,TEM,PL and XPS.Based on the photodegradability test of phenol,the results show that the 1%WBO composite has the best photocatalytic degradation performance.The introduction of oxygen vacancies in BiO2-x and the doping of W ions have effectively improved the separation efficiency of electron-hole pairs in BiO2-x,and enhanced the photocatalytic degradation performance.(2)BiO2-x/RGO aerogel was prepared by hydrothermal method,and the samples were characterized and analyzed using XRD,UV-Vis DRS,SEM,EDX,PL and FT-IR,and under simulated sunlight the photodegradability test of p-nitrophenol was performed.The results show that BiO2-x/RGO aerogel has better ability to remove organics than pure sample BiO2-x and pure RGO aerogel.The conductivity of reduced graphene oxide in BiO2-x/RGO aerogels helps to improve the separation efficiency of electron-hole pairs of BiO2-x,enhances the photocatalytic degradation performance,and the strong adsorption of RGO aerogels is removed in concert P-nitrophenol.In addition,due to the easy recovery of the carrier RGO aerogel cylinder,BiO2-x/RGO aerogels show excellent recycling performance.