CdS-Al203论文纳米复合结构材料的制备及其光催化性能的研究CdS-Al203论文：纳米复合结构材料的制备及其光催化性能的研究.doc

CdS/Al203论文：纳米复合结构材料的制备及其光催化性能的研究 【中文摘要】近年来,环保问题越来越受到人们的关注,污水和废气的排放对环境影响巨大,所以探索研究经济有效的污水及废气处理技术势在必行。纳米材料具有独特的物理化学特性,具有良好的分离、光催化、 【英文摘要】In recent years, environmental problem is subjected to people’s concern. Especially, there exists a huge influence of the sewage and waste gas emissions on environment. Therefore, the research on the economic and effective sewage waste gas treatment technology is imperative. For nanomaterials, they in general possess gene some special physical and chemistry properties, such as good separation, catalyst, reduction and adsorption. Additionally, the small size of structure unit can make it contact effectively with pollutants, and thus, it can show high photocatalyst effect compared with the traditional water treatment technology. Therefore, nanostructured materials show a wide application prospect in water treatment fields.The photocatalysis can completely degrade organic pollutants into CO2 and H2O. In general, the nanomaterials with photocatalytic properties are almost semiconductor. When the nanostructured particles are irradiated by the light with energy higher than its band gap, electrons can be excited effectively from valence band to conduction band. Thus, quantities of electrons and holes can exist in conduction band and valence band, respectively. Moreover, the high active electrons and holes can form a redox system. Additionally, because the size of nanoparticles is very small, photogenerated carriers can easily migrate onto the nanoparticle surface through a simple diffusion, and then take place redox reaction with the electron donor or acceptor.The composite with two or more nanomaterials may have some new features. When nanostructured CdS with a narrow band gap was loaded into one-dimensional (1D) nanostructured Al2O3 with a high specific surface area, CdS can be used as photocatalyst and 1D Al2O3 can be used as an absorbent. Organic pollutants can be absorb eff