Study On The High Efficiency Photodegradation Nanocomposite

Today, more and more people pay their attention to the environmental problems caused bywater pollution. How to deal with industrial and domestic pollutants in water has become a hotissue now. In this context, the photocatalytic technology has a big development as an emergingenvironmental technology. The principle is that the semiconductor material has electronictransitions in the light and then superoxide generated, they can degrade organic species orpollutants in water to CO2and H2O.The wurtzite structure zinc oxide (ZnO) has a direct and wide band gap semiconductor with3.27eV band gap energy at room temperature, and60meV exciton bondage energy. ZnO hasextensive applications in different field especially in the field of photocatalys. However, the ZnOsemiconductor material is not sensitive to visible light, and the holes and electrons of ZnO have agreater chance of the composite, so the photocatalytic properties of ZnO semiconductor materialis limited. To improve the photocatalytic performance, we composite ZnO and some materials toprepare certain new nanocomposites, these new materials have some advantageous propertiesthat may be used to study and efficient aspect photodegradationTherefore, in this thesis, ZnO nanomaterials are studied as the main subject, improvingphotocatalysis performance as the research research purposes, through the synthesis of differentcomposite materials to test their photocatalytic activity as the research content, the details are asfollows:1. ZnO-CuO nanocomposite was synthesized by using a low-temperature hydrothermal andphotochemical deposition process. And its growth mechanism and photocatalysis properties wereexplored. The result was that the nanocomposites showed a great improvement in photocatalyticperformance because adding CuO can effectively increase the surface area of the material andimprove the optical response range.2. ZnO-Fe2O3nanotube composites were prepared by a low-temperature hydrothermal andphotochemical deposition process. And the formation process of the tubular morphology wasexplored. The experimental results show that ZnO-Fe2O3nanocomposite has the best tubularmorphology when photochemical deposition process is2h.3. ZnO-Fe2O3nanotube composites were synthesized by hydrothermal-photochemaicaldeposition method and its photocatalytic property was studied. The result showed that the photocatalysis of composite material has been greatly improved, mainly due to the added Fe2O3can improve the response range of the light, increase the light absorption intensity, and greatlyincrease the surface area of the material..4. ZnO-3D graphene nanocomposite (ZOG) was prepared by simple hydrothermal method.The result shows that the nanocomposite has a great improvement in photocatalytic activity. Thehigh mobility of graphene contributes to the enhancement the electron-hole separation rate.