Preparation of TiO2Photocatalyst Dual-modified by Transition Metal Doping and Carbon Nanotube (CNT) Grafting

Lei Ma, Jindong Lu, Hongbo He, Chunzhong Li, Aiping Chen
2012 Huaxue xuebao  
华东理工大学材料科学与工程学院 超细材料制备与应用教育部重点实验室 上海 200237) 摘要 提出了一种过渡金属掺杂和碳纳米管(CNT)双重改性 TiO 2 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/TiO 2 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/TiO 2 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 TiO 2 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 TiO 2 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 TiO 2 的比表面积小、 量子效率低等缺点, 明显提高了 TiO 2 的光催化活性. Abstract A new method for the preparation of TiO 2 dual-modified
more » ... y transition metal doping and carbon nanotube (CNT) grafting was proposed. Fe-NiO/TiO 2 was prepared by sol-gel method. Then CNTs were grafted on Fe-NiO/TiO 2 by fluidized bed chemical vapor deposition (FBCVD) method. The dual-modified CNT/Fe-Ni/TiO 2 composite photocatalyst has been characterized by X-ray diffraction (XRD), Raman spectra, field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), UV-Vis absorption spectra and photoluminescence spectra. The photocatalytic activities of prepared samples were investigated by the photodegradation of methylene blue (MB). The results show that CNT grafted on TiO 2 had good graphite structure, and small part of TiO 2 was transformed from anatase to rutile during FBCVD process. Double modification of transition metals and CNT can effectively overcome intrinsic defects of TiO 2 in small specific surface area and low quantum efficiency. And the photocatalytic activity has been improved significantly.
doi:10.6023/a1108312 fatcat:tjkcnljwv5cp3miaj4ea67bpnu