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 im-pregnation 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 me-thod 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-C3N4and synergistic effect among TiO2, ZnO and RGO.
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