【摘要】 以高岭土、钛酸四丁酯和硝酸锌为原料，采用溶胶-凝胶法制备了Zn掺杂纳米TiO₂/高岭土复合光催化材料（ZTK），通过X射线衍射仪、扫描电镜、能谱仪和激光粒度分析仪对样品结构进行表征，以可见光催化降解亚甲基蓝（MB）为探针反应，研究了Zn掺杂量、高岭土复合比和焙烧温度条件对样品光催化性能的影响。结果表明，高岭土的多片层结构具有较大的比表面积，复合后能有效改善纳米TiO₂分散性，有利于增强对污染物分子的吸附，Zn掺杂能抑制光生电子-空穴的复合，Zn掺杂和高岭土复合协同作用提高了样品光催化降解MB的性能。Zn掺杂量为1.0%，高岭土与Zn-TiO₂复合比为1∶1.5，焙烧温度为500℃时，复合样品对MB在可见光辐照5 h的降解效率最高，为99.2%。更多还原

【Abstract】 Zinc doped nano TiO₂/kaolin composite photocatalyst（ZTK） was prepared by sol-gel method using kaolin, tetrabutyl titanate and zinc nitrate as raw materials. The structure of the samples was characterized by XRD, SEM, EDS and laser particle size analyzer. The influence of Zn doping,kaolin composite ratio and calcination temperature on the photocatalytic properties of the samples were studied by visible light photocatalytic degradation of methylene blue（MB） as probe reaction. The results show that the lamellar structure of kaolin has a large specific surface area. The dispersion of nano-TiO₂ is effectively improved after compounding with kaolin, which is conducive to enhance the adsorption of pollutant molecules. Zn doping can inhibit the recombination of photogenerated electrons and holes. The synergistic effects of Zn-doping and kaolin compounding improve the ZTK’s photocatalytic degradation performance of MB. When the doping amount of Zn is 1.0%, the composite ratio of kaolin to Zn-TiO₂ is 1∶1.5 and the calcination temperature is 500 ℃, the degradation efficiency of composite sample for MB under visible light irradiation within 5 hours is up to 99.2%.更多还原