2D/1D复合材料C3N4/CdS的构筑及其光催化制氢性能研究

摘要

利用超声-沉积法将CdS纳米线复合到C3N4表面,制备出一系列2D/1D复合C3N4/CdS光催化剂.采用X射线衍射(XRD)、透射电子显微镜(TEM)、紫外可见漫反射(UV-Vis-DRS)和荧光光谱(PL)等手段对复合材料的晶体结构、微观形貌和光学性能进行了表征和分析.采用可见光光催化分解水产氢的方法对其光催化性能进行评价,考察了复合催化剂的构筑方法以及CdS含量对复合光催化剂活性的影响,同时对影响其光催化性能的因素和机理进行了探讨.研究结果表明,CdS纳米线的引入在C3N4表面形成了无机/有机异质结构,显著提高了光催化产氢活性,且复合物中CdS与C3N4质量比为0.1时的产物光催化活性较佳.%CdS nanowires were composited onto the surface of C3N4 nanosheets by an ultrasonic-deposition method and a series of 2D/1D composite C3N4/CdS photocatalysts were prepared.The crystal structure, microtopography and optical properties of the composites were characterized and analyzed by X-ray diffraction (XRD), transmission electron microscopy (TEM), UV-Vis diffuse reflectance (DRS) and fluorescence spectroscopy (PL), respectively.Photocatalytic H2 evolution from splitting of water was carried out to evaluate the photocatalytic activity of the nanocomposites under visible light irradiation.The effects of synthetic methods and CdS contents on photocatalytic activity of C3N4/CdS were investigated.Meanwhile, the influence factors and mechanism of photocatalytic performance were discussed.The results showed that effective inorganic/organic heterojunctions were constructed between C3N4 and CdS, therefore, the photocatalytic activity was much enhanced.When the mass ratio of CdS to C3N4 was 0.1, the composite performed the preferable photocatalytic activity.