Preparation And Properties Of Photocatalyst With Titanium Dioxide Fiber As Matrix

With the production efficiency continues to increase,the surrounding environmental pollution problems become increasingly prominent.Environmental pollution problems can not get everyone's attention,accompanied by air pollution,water pollution,land pollution,will cause the greenhouse effect,ecological balance and harm to human health.In order to pursue a better living environment,the development of more excellent photocatalyst is very meaningful.Among the many semiconductor photocatalytic materials,TiO₂ has great application value in gas and water pollutant treatment and light energy conversion because of its high stability,non-toxic,no secondary pollution and low cost.At present,TiO₂ is the most widely used catalyst.However,the TiO₂ band gap is wide?anatase Eg = 3.2e V?,can only absorb ? <387.5 nm of ultraviolet light,low utilization of sunlight and photo-generated electrons and holes easily complex shortcomings greatly limit the type of catalyst.Titanium dioxide for doping,loading and other means of modification,can improve the application of titanium dioxide material.Therefore,we selected TiO₂ fiber as the carrier to prepare Bi,V co-doped TiO₂ fiber and MoS₂/CdS/TiO₂ fiber material.The material has visible photocatalytic properties,and improving the photocatalyst recovery in the use of sewage.The paper mainly includes the following contents:?1?Precursor gel was prepared by using n-butyl titanate,acetylacetone,PVP and anhydrous ethanol as raw materials,and then using electrospinning and heat treatment ways to obtain titanium dioxide fiber.The fiber is titanium dioxide with anatase phase,and their diameter is about 300 nm to 400 nm,the length is greater than 1 micron,the surface is rough.?2?Dissolve vanadate and bismuth nitrate in a certain concentration of nitric acid as a dopant,dopped into?1?precursor gel,after the electrospinning technology,heat treatment to get Bi,V co-doped TiO₂ fiber.20 mg of the catalyst Pour into 50 m L of 5mg/L Rh B aqueous solution and illuminated in visible light,it was found that Bi-V doped TiO₂ fibers with m[?Bi+V?/Ti]=27.3% doping content had higher visible photocatalytic properties compared with undoped TiO₂ fibers.?3?MoS₂/CdS/TiO₂ composite fiber was prepared by TiO₂ fibers loading with Cadmium sulfide and molybdenum disulfide by hydrothermal method.It was found that the composition of the catalyst was TiO₂ fiber as the carrier,the surface supported granular cadmium sulfide and the fine layer of molybdenum disulfide.The adsorption properties of the catalyst were obvious,and under visible light exposure,the best photocatalytic when the 20 mg of the catalyst into 50 m L of 15mg/L MB aqueous solution can be close to 80%.