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采用水热法制备了一系列混合相二氧化钛-石墨烯(Tr G)的复合物,并考察了石墨烯的用量对降解污染物甲基蓝的影响.采用X射线衍射(XRD),傅里叶变换红外(FTIR)光谱,高分辨透射电镜(HRTEM),拉曼光谱,紫外-可见漫反射吸收光谱(UV-Vis DRS),X射线光电子能谱(XPS)和比表面积(BET)等测试手段对复合材料进行表征.结果表明,复合材料中Ti O2为棒状的混合相,且均匀分散在石墨烯表面.由于石墨烯良好的吸光性能,混合相中的异质结和复合物的良好光电子传递能力以及高比表面积,复合材料具有较高的光催化活性.所制备的Tr G复合材料在紫外光下降解甲基蓝的催化活性均高于纯Ti O2,且当氧化石墨烯负载量为0.8%(质量分数,w)时,复合材料Tr G具有较好的光催化效果.
A series of mixed phase titania-graphene (Tr G) composites were prepared by hydrothermal method and the effects of the amount of graphene on the degradation of methyl blue were investigated. X-ray diffraction (XRD) (FTIR), high resolution transmission electron microscopy (HRTEM), Raman spectroscopy, UV-Vis DRS, X-ray photoelectron spectroscopy (XPS) and specific surface area The results show that Ti O2 in the composite is a rod-like mixed phase and uniformly dispersed on the graphene surface.Because of the good light-absorbing properties of graphene, the heterojunction in the mixed phase and the good photoelectron transfer Ability and high specific surface area of the composites with high photocatalytic activity.The catalytic activity of the prepared Tr G composites to degrade methyl blue under ultraviolet light is higher than that of pure Ti O2 and when the graphene oxide loading is 0.8% Mass fraction, w), the composite Tr G has a good photocatalytic effect.