【摘要】 草甘膦作为全球用量最大的农药品种，产生的废水造成了巨大的环境污染。光催化氧化技术具有操作方便、反应温和、降解完全等优势。二氧化钛纳米管阵列(TNTAs)结构独特、比表面积大，成为近年来备受关注的一种光催化剂，但其仅能吸收387 nm以下的紫外光，应用受到限制。本论文首先采用阳极氧化法制备了TNTAs,水热法制备了碳量子点(CQDs),然后恒温水浴制备了CQDs敏化的CQDs/TNTAs复合光催化剂，并利用紫外-可见分光光度计、荧光光谱仪、扫描电镜、透射电镜及X射线衍射仪等对该样品进行了表征。通过草甘膦的光催化降解反应对复合光催化剂进行活性评价。实验结果表明3次敏化后的CQDs/TNTAs对草甘膦降解活性是TNTAs的1.98倍。CQDs敏化一方面提高了TNTAs对可见光的吸收，另一方面与TNTAs建立了异质结，有助于光生电子-空穴的分离和传输，减少了光生空穴-电子对的复合，从而提高了光催化性能。更多还原

【Abstract】 Titanium dioxide has attracted much attention as a photocatalyst because of its unique structure and high surface area. However, its application is limited due to the narrow spectral response range. Titanium dioxide nanotubes arrays(TNTAs) were prepared by anodic oxidation method, and carbon quantum dots(CQDs) were prepared by hydrothermal method. Then carbon quantum dots sensitized CQDs/TNTAs composite photocatalysts were prepared in a constant temperature bath and then characterized by UV-Vis spectrophotometer, fluorescence spectrometer, scanning electron microscope, transmission electron microscope and X-ray diffraction. Then the photocatalytic performance was tested by the photocatalytic degradation of glyphosate. The results showed that the photodegradation efficiency of CQDs/TNTAs was 1.98 times higher than that of TNTAs. On one hand, the sensitization of CQDs extended the light absorption to visible light region, and on the other hand, the separation and transfer efficiency of photo-generated electron-hole was promoted. In conclusion, the combination of carbon quantum dots and titanium dioxide can effectively improve the photocatalytic performance of titanium dioxide nanotube.更多还原