The Synthesis、Characterization And Modified Of BiOX(I、Br、Cl)

Halogen bismuth oxide BiOX (X= Cl, Br, I) is a new kind of inorganic material, has a unique layer structure, the connection between layers is a vertical electrostatic force. They have a good sensitivity to visible light and a good light corrosion resistant performance, so they are a kind of important visible light catalyst.So, it is important to prepare the BiOX nanoparticles by different methods and improve its properties by doping and load, the preparation of the composite material or heterostructure materials has great research significance and practical value.In this article, TiO2/BiOI heterostructure nanofibers with the different shape and sizes were synthesized by electrospinning technology combined with hydrothermal. BiOI with different forms grows in TiO2 nanofibers, such as schistose, globular, roselike, its preparation process is simple, the repeatability is very good, due to the formation of the heterostructure samples,the special band structure, the higher light absorption efficiency. Heterostructure TiO2/BiOI nanofibers, compared with single BiOI and area of TiO2,own bigger specific surface,better adsorption, faster photocatalytic reaction rate, and its light catalytic cycle experiments also showed batter stabili ty, and through the TOC experiment proves that the pollution is not only a liquid absorbance decreased, the total content of organic matter also reduce gradually over time, so it has a good application prospect.By the method of ultrasonic and solvothermal, BiOI/graphene composites were also synthesized. Firstly, graphene was dispersed to the solution by ultrasonic processing, then, the preparation of BiOI/graphene composites carried out through solvothermal.BiOI plate interlacing densely growed on the surface of grapheme. Compared with the composite material synthsised in the hydrothermal method under the same conditions, it has better photocatalytic effect, better light absorption effect and light catalytic effect.By electrospinning and PVP as adhesive, the preparation of the BiOCl hollow nanotube was carried out directly. BiOCl hollow nanotube, the hollow structure is good for the transmission of electrons and pollutant molecules, so it showed more excellent photocatalytic effect than pure BiOCl microsphere.