Development And Application Of New Photocatalyst Materials

Photocatalyst material is a kind of semicondutor material which is mainly consisted of TiO₂ and can decompose the volatile organic compound into CO₂ and H₂O irradiated under visible light.It has been widely used into indoor air pollution control,industrial waste gas treatment,and water pollution.However,the traditional photocatalyst absorbtion of sun energy is less than 5%and it entirely depends on the ultraviolet light.The main topic is to develop the new photocatalyst and improve the catalytic efficiency,photoabsorption efficiency and increase the absorption range of visible light.In this study,we just utilize a simple ball-milling method,recombination commercial Bi₂O₃ and nano-TiO₂ to prepare nano-heterojunctiong catalyst.And research the different ratio of reactants,surfactant,milling time and the ball-milling speed how to impact the Bi₂O₃-TiO₂ heterojunction physical and chemical property.The size of nano-heterojunction composite semiconductor materials around 10 nm studied by analysis SEM and TEM,including nanoparticles and nanorods.Shown in HR-TEM,the nanorods are obtained by nanoparticles’absorbtion and directional growth,forming a porous structure.It is helpful to improve specific surface area and the photocatalytic performance.Morever,it confirmed that we have combined Bi₂O₃（1 1-2）and TiO₂（1 0 3）heterojunction.According to analyzing the datas of XRD,EDS,XPS,we can be sure that the Bi₂O₃-TiO₂ heterojunction structure has been successfully made.Finally,to analyze the degradation efficiency of methy orange solution using the photocatalyst,it can reach 100%in two hours,even after four times,the efficiency still keeps 100%.Proved that has excellent cycle performance and cycle performance.The sample is stable milky white solution.According to Zeta potential results,this new type photocatalyst has excellent colloidal stability,and it can uniformly disperse in water.It is suitable for the commercial production.Compared with the photocatalyst products on the market,this sample has more obvious degradation property than the others.At present,it has been widely used in indoor air pollution control and industrial waste gas treatment and other fields.