不同管径的多壁碳纳米管-二氧化钛光催化剂的苯酚光催化降解

Photocatalytic Degradation of Phenol over MWCNTs-TiO2 Composite Catalysts with Different Diameters

采用溶胶-凝胶法制备了不同管径的多壁碳纳米管-二氧化钛（MWCNTs—TiO2）催化剂．应用热重分析、N2等温吸附和BET比表面、X射线衍射、扫描电镜以及漫反射紫外可见吸收光谱等对样品进行了表征．选择光催化降解苯酚反应对光催化剂性能进行了测试，结果表明，MWCNTs—TiO2催化剂在苯酚降解反应中表现出明显的协同效应，并分别采用表观反应速率常数、总有机碳消除和光子效率对此协同效应进行了评价．

Titania-based composite catalysts were prepared through a sol-gel route employing multi-walled carbon nanotubes with different diameters. The materials were characterized using thermogravimetric analysis, nitrogen adsorption-desorption isotherm, powder X-ray diffraction, scanning electron microscopy, and diffuse reflectance UV-Vis absorption spectra. The application of the catalysts to photocatalytic degradation of phenol was tested under UV-Vis irradiation. A synergetic effect on phenol removal was observed in case of composite catalysts, which was evaluated in terms of apparent rate constant, total organic carbon removal and photonic efficiency.