Abstract

This work aimed to enhance the photocatalytic degradation efficiency of WO₃/TiO₂ catalyst by decorating with carbon fibers (CF) which have excellent conductivity and uniform micropore size distribution. The carbon fiber based catalysts were prepared through a facile solvothermal technique and the as-synthesized samples were characterized by X-ray photoelectron spectroscopy (XPS), Scanning electron microscopy (SEM) and UV–Vis diffuse reflectance spectroscopy (UV-DRS), Raman and X-ray powder diffraction (XRD) techniques. The photocatalytic activities of carbocatalysts were investigated by degrading the selected antibiotic (ciprofloxacin) under day light illumination. When the amount of carbon fiber was increased from 2.5 wt.% to 9 wt.%, the photocatalytic degradation rate was almost doubled. The effects of different parameters such as carbon fiber amount, solution pH and water matrix on the catalytic performance were explored; and the effect of radical ions was investigated by adding trapping agents. The promoted activity for the carbocatalysts was assigned to the synergetic effect of adsorption/photocatalysis, electrical features of carbon fibers and reduced band gap energy.

摘要

本工作旨在提高WO ₃ /TiO _{2的光催化降解效率}碳纤维（CF）修饰催化剂，具有优异的导电性和均匀的微孔尺寸分布。通过简便的溶剂热技术制备碳纤维基催化剂，并通过 X 射线光电子能谱 (XPS)、扫描电子显微镜 (SEM) 和紫外-可见漫反射光谱 (UV-DRS)、拉曼光谱对合成后的样品进行表征。和 X 射线粉末衍射 (XRD) 技术。通过在日光照射下降解选定的抗生素（环丙沙星）来研究碳催化剂的光催化活性。当碳纤维的用量从 2.5 wt.% 增加到 9 wt.% 时，光催化降解率几乎翻了一番。探讨了碳纤维用量、溶液pH值、水基质等不同参数对催化性能的影响；并通过添加捕集剂研究了自由基离子的影响。碳催化剂的促进活性归因于吸附/光催化的协同作用、碳纤维的电特性和带隙能量的降低。