rGO/TiO2复合光催化剂的制备及光催化性能

摘要

用Hummers法制备氧化石墨烯(GO)，以柠檬酸作为钛酸四丁酯的水解抑制剂和氧化石墨烯的表面活性剂制备GO/TiO2前驱体溶胶，经过干燥、热处理后用NaBH4还原得到还原氧化石墨烯/TiO2(rGO/TiO2)复合光催化剂.利用X射线衍射(XRD)、透射电镜(TEM)、荧光光谱(PL)对其进行表征分析；研究了GO的引入量、光催化剂的投入量对甲基橙降解性能的影响.结果表明：柠檬酸的加入能有效改善纳米TiO2在rGO表面的分散情况；rGO/TiO2复合光催化剂的光催化活性明显高于纯TiO2；GO的加入量为10%且催化剂用量为0.1g时催化效果最佳.%Graphene oxide (GO) was prepared by the Hummers method. In the synthesis process of GO/TiO2 precursor sol, citric acid was selected as the hydrolysis inhibitors of tetrabutyl titanate and the surfactant of graphene oxide. After drying and heat treatment, the reduced graphene oxide/TiO2(rGO/TiO2) photocatalysts were prepared by the method of sodium borohydride reduction. The photocatalysts were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and photoluminescence (PL) spectroscopy technology. The effects of the amounts of GO additives and the photocatalysts on the degradation rate of methyl orange were investigated, respectively. The dispersion of nanometer TiO2 on the graphene surface was improved effectively; the photocatalytic activity of rGO/TiO2 was obviously higher than that of pure TiO2, and the rGO/TiO2 photocatalysts presented the best photocatalytic performance with the GO amount of 10% and the photocatalysts mass of 0.10g.