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提出了一种过渡金属掺杂和碳纳米管(CNT)双重改性TiO2的新方法:首先采用溶胶-凝胶法合成掺杂镍和铁的二氧化钛基催化剂,然后采用流化床化学气相沉积方法(FBCVD)在二氧化钛基催化剂表面接枝生长CNT,得到CNT/Fe-Ni/TiO2复合光催化剂.通过X射线衍射、扫描电子显微镜、比表面分析、拉曼光谱、紫外-可见吸收光谱、荧光光谱等方法考察了双重改性复合光催化剂CNT/Fe-Ni/TiO2的结构和性能,通过降解亚甲基蓝溶液评价了双重改性复合光催化剂的活性.结果表明,在TiO2表面接枝的CNT具有较好的石墨化结构,CNT生长过程中小部分TiO2由锐钛矿向金红石晶型转变.过渡金属和CNT双重改性有效地克服了TiO2的比表面积小、量子效率低等缺点,明显提高了TiO2的光催化活性.
A new method of transition metal doping and double modification of carbon nanotubes (CNTs) was proposed. Firstly, a titania-based catalyst doped with nickel and iron was synthesized by sol-gel method. Then, a fluidized bed chemical vapor deposition (FBCVD) on the surface of titania-based catalyst to obtain CNT / Fe-Ni / TiO2 composite photocatalyst by X-ray diffraction, scanning electron microscopy, surface area analysis, Raman spectroscopy, UV-Vis absorption spectroscopy, fluorescence spectroscopy The structure and properties of the double modified composite photocatalyst CNT / Fe-Ni / TiO2 were investigated and the activity of the double modified composite photocatalyst was evaluated by degradation of methylene blue solution.The results showed that the CNTs grafted on the surface of TiO2 were better Of the graphitization structure, a small part of the TiO2 during the growth of CNTs changes from anatase to rutile crystal form.Double modification of transition metal and CNT effectively overcomes the defects of small specific surface area and low quantum efficiency of TiO2, obviously improves the light of TiO2 Catalytic activity.