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以溶胶 凝胶法制备的TiO2 纳米粒子为载体 ,通过浸渍法制备了Au/TiO2 样品 ,并利用XPS和SPS等技术对样品进行表征 ,考察了热处理温度和Au含量对TiO2 纳米粒子光催化氧化苯酚活性的影响 .结果表明 ,Au是以金属纳米微晶的形式均匀地分散在TiO2 纳米粒子表面 .用适量Au进行表面修饰不仅拓宽了TiO2 对光的响应范围 ,而且改善了TiO2 光生电子和空穴的分离效率 ,提高了样品对氧物种的吸附 ,并促进了光生电子向吸附氧的传输 .在光催化氧化苯酚反应中 ,5 0 0℃处理的Au/TiO2 纳米粒子具有较高的光催化活性 ,这与XPS和SPS表征结果是一致的 .从电子能级匹配的角度揭示了Au对TiO2样品表面光电性质和光催化性能的影响机制 .
The TiO2 nanoparticles prepared by sol-gel method were used as supports to prepare Au / TiO2 samples by impregnation method. The samples were characterized by XPS and SPS techniques. The effects of heat treatment temperature and Au content on the photocatalytic oxidation of phenol The results show that Au is uniformly dispersed on the surface of TiO2 nanoparticles in the form of metal nanocrystallines.The surface modification with an appropriate amount of Au not only broadens the response range of TiO2 to light but also improves the photogenerated electron and hole of TiO2 Of the separation efficiency and improve the sample adsorption of oxygen species and promote the transfer of photo-generated electrons to the adsorbed oxygen in the photocatalytic oxidation of phenol reaction, 500 ℃ treated Au / TiO2 nanoparticles have a higher photocatalytic activity , Which is consistent with the results of XPS and SPS characterization.The mechanism of the effect of Au on the surface electro-optical properties and photocatalytic activity of TiO2 is revealed from the electron energy level matching.