Wang Huan-Ying, Li Wen-Jun, Chang Zhi-Dong, Zhou Hua-Lei, Guo Hui-Chao
School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2011 Sep;31(9):2529-32.
A novel kind of carbon nanotubes/titanium dioxide (CNTs/TiO2) composite photocatalyst was prepared by a modified sol-gel method in which the nanoscaled TiO2 particles were uniformly deposited on the CNTs modified with poly(vinyl pyrrolidone) (PVP). The composites were characterized by a range of analytical techniques including high resolution transmission electron microscopy (TEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The results show the successful covering of the CNTs with PVP, forming core-shell structure. The nanoscaled TiO2 particles were uniformly deposited on the surface of CNTs reducing the bare CNTs which avoid losing the absorption and scattering of photons. The combination of CNTs and TiO2 particles imply the enhanced interactions between the CNTs and TiO2 interface which possibly becomes heterojunction. The composites become mesoporous crystalline TiO2 (anatase) clusters after annealing at 500 degrees C, and the surface area increases obviously. The photocatalytic activities of surface modification CNTs/TiO2 (smCNTs/TiO2) composites are extremely enhanced from the results of the photodegradation of methylene blue (MB).
采用改进的溶胶 - 凝胶法制备了一种新型的碳纳米管/二氧化钛（CNTs/TiO₂）复合光催化剂，该方法是将纳米级TiO₂颗粒均匀沉积在经聚乙烯吡咯烷酮（PVP）改性的碳纳米管上。通过一系列分析技术对复合材料进行了表征，包括高分辨率透射电子显微镜（TEM）、X射线衍射（XRD）和X射线光电子能谱（XPS）。结果表明，PVP成功包覆在碳纳米管上，形成了核壳结构。纳米级TiO₂颗粒均匀沉积在碳纳米管表面，减少了裸露的碳纳米管，避免了光子吸收和散射的损失。碳纳米管与TiO₂颗粒的结合意味着碳纳米管与TiO₂界面之间的相互作用增强，这可能形成异质结。在500℃退火后，复合材料变成介孔结晶TiO₂（锐钛矿）簇，表面积明显增加。从亚甲基蓝（MB）光降解结果来看，表面改性的碳纳米管/TiO₂（smCNTs/TiO₂）复合材料的光催化活性得到了极大提高。
