【摘要】 目的提高半导体石墨相氮化碳（g-C₃N₄）的光催化性能。方法通过Hummers法和半封闭一步热裂解法制备了氧化石墨烯（GO）和g-C₃N₄,再分别利用溶剂热法、热缩聚法和浸渍化学还原法制得相应的TiO₂/g-C₃N₄、ZnO/g-C₃N₄、RGO/g-C₃N₄复合材料。采用X-射线衍射（XRD）、扫描电子显微镜（SEM）、X射线光电子能谱（XPS）、紫外-可见漫反射吸收光谱（UV-Vis DRS）和傅里叶变换红外光谱（FT-IR）等手段对复合材料进行表征,并以降解罗丹明B（Rh B）来评价其在可见光下的光催化性能。结果以尿素与三聚氰胺的混合物为原料通过热裂解法制备的g-C₃N₄,比使用纯尿素制备的g-C₃N₄具有更优的催化效果。TiO₂、ZnO、RGO的引入提高了g-C₃N₄的光催化活性,Rh B的降解率分别为95.6%、95.0%、78.1%。RGO质量分数为2.0%时,RGO/g-C₃N₄复合材料的催化效率最高。结论通过g-C₃N₄特殊的能带调控优势与TiO₂、ZnO、RGO的协同作用,提高了复合材料在可见光区的吸收强度和电子传导能力,进而提高了在可见光下的光催化性能。更多还原

【Abstract】 The work aims to improve photocatalytic performance of graphite carbon nitride（g-C₃N₄）. Graphene oxide（GO） and g-C₃N₄ were prepared by Hummers method and one-step semi-enclosed pyrolysis method respectively, then TiO₂/g-C₃N₄, ZnO/g-C₃N₄ and RGO/g-C₃N₄ composites were fabricated in solvothermal method, thermal polycondensation method and impregnation chemical reduction method, respectively. The composite materials were characterized by X-ray diffractometer（XRD）, scanning electron microscopy（SEM）, X-ray photoelectron spectroscopy（XPS）, UV-Vis diffuse reflectance absorption spectroscopy（UV-Vis DRS） and Fourier transform infrared spectroscopy（FTIR）. Simultaneously, photocatalytic performance of the composites was evaluated based on degradation reaction of Rhodamine B（Rh B）. The g-C₃N₄ prepared in pyrolysis method and made of melamine and urea exhibited higher photocatalytic activity than that made of pure urea. The introduction of TiO₂, ZnO and RGO considerably enhanced photocatalytic activity of g-C₃N₄, and degradations rate of Rh B rate was 95.6%, 95.0% and 78.1%, respectively. The RGO/g-C₃N₄ composite exhibited highest catalytic efficiency provided with 2.0 wt% RGO. Absorption intensity and electron conduction capability of the composites as well as photocatalytic performance in visible light are improved due to special band control advantage of g-C₃N₄ and synergistic effect among TiO₂, ZnO and RGO.更多还原