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（RhB）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，RhB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。

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 (RhB). 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 RhB 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.