CNTs/TiO_2复合物制备及光催化性能研究

Synthesis and Photocatalytic Activity of Carbon Nanotubes/Titanium Dioxide Nanocomposites

在不使用表面活性剂的情况下,采用溶胶–凝胶法成功制备CNTs/TiO2复合物,利用XRD、TEM、HRTEM和SAED对样品的结构和形貌进行了表征。选取亚甲基蓝溶液为目标降解物,利用紫外–可见(UV-Vis)分光光度计考察了CNTs/TiO2复合物的光催化活性,系统研究了CNTs掺杂量对催化降解效率的影响。实验结果表明:经450℃煅烧,锐钛矿相TiO2通过C–O–Ti键均匀地涂覆在CNTs表面,TiO2颗粒尺寸约16 nm。CNTs/TiO2复合物光催化活性明显高于纯TiO2,当CNTs掺杂量为1wt%时,CNTs/TiO2复合物对亚甲基蓝的催化降解效率最高,比纯TiO2提高11.7%。

CNTs/TiO2 nanocomposites were prepared by Sol-Gel method without any surfactant. The as-prepaired samples were characterizated by using X-ray diffraction, transmission electron microscope, high resolution transmission electron microscopy, selected area electron diffraction and UV-Vis spectrophotometer. The degradation experiment of the methylene blue under UV-light was used to evaluate the catalytic activity of the CNTs/TiO2 catalysts, and the influence factors of catalytic efficiency such as CNTs doping concentration were studied systematically. The results suggest that the anatase titanium dioxide coat on the surfaces of CNTs uniformly in the form of C–O–Ti after annealing at 450℃, and the size of TiO2 nano-particle is about 16 nm. Moreover, CNTs/TiO2 nanocomposites show a distimctive photodegradation efficiency, CNTs/TiO2 nanocomposites with 1wt% CNTs present an increase of photodegradation efficiency by 11.7% as regarding to pure TiO2.