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采用溶胶凝胶法分别制备p-MWNTs-TiO2及p-MWNTs/ZnTPP-TiO2复合纳米光催化剂,并通过热重分析、透射电镜、X射线粉末衍射和紫外-可见漫反射光谱对光催化剂的物理性质进行了表征.结果表明:复合光催化剂中碳纳米管热解温度明显提前,TiO2晶化温度延迟,相变受到抑制,紫外特征吸收较纯TiO2有明显红移.对所制备的光催化剂进行光解水产氢性能测试结果表明:光催化剂的产氢速率维持相对恒定,有较好的光学稳定性;p-MWNTs和p-MWNTs/ZnTPP对TiO2的掺杂提高了其光催化活性,光催化剂产氢活性的大小顺序为p-MWNTs/ZnTPP-TiO2>p-MWNTs-TiO2>P25>TiO2.
The p-MWNTs-TiO2 and p-MWNTs / ZnTPP-TiO2 nanocomposite were prepared by sol-gel method. The photocatalytic properties of the photocatalysts were characterized by thermogravimetric analysis, transmission electron microscopy, X-ray powder diffraction and UV-visible diffuse reflectance spectroscopy The results showed that the pyrolysis temperature of carbon nanotubes in composite photocatalyst was significantly advanced, the crystallization temperature of TiO2 was delayed, the phase transition was inhibited, and the UV absorption of the composite was obviously red shifted compared with that of pure TiO2. The photolysis hydrogen production performance test results show that: the photocatalyst hydrogen production rate remained relatively constant, has good optical stability; p-MWNTs and p-MWNTs / ZnTPP doped TiO2 to improve its photocatalytic activity, photocatalyst The order of hydrogen production activity is p-MWNTs / ZnTPP-TiO2> p-MWNTs-TiO2> P25> TiO2.