TiO_2-rGO制备及其对亚甲基蓝溶液的降解  

Preparation and application of TiO_2-rGO in photocatalytic degradation of methylene blue solution

作　　者：刘晶晶[1] 宋存义[1] 童震松[1] 

机构地区：[1]北京科技大学土木与环境工程学院,北京100083

出　　处：《环境工程学报》2015年第10期4890-4896,共7页Chinese Journal of Environmental Engineering

摘　　要：本实验用改进的Hummers法制备氧化石墨烯(GO),通过溶胶-凝胶法制备得到TiO2-石墨烯复合材料(TiO2-r GO),研究了不同制备条件对复合材料光催化性能的影响。采用X射线衍射(XRD),拉曼光谱(Raman),比表面积(BET),扫描电镜(SEM),透射电镜(TEM)、紫外-可见(UV-Vis)吸收光谱和荧光光谱(PL)等测试手段对复合材料进行表征。结果表明,TiO2-r GO复合材料中的TiO2为锐钛相,且能均匀附着在石墨烯片层上,呈现层状堆积结构;与纯TiO2相比,复合材料具有较大的比表面积和更高的可见光响应。研究了该复合催化剂在紫外光下对亚甲基蓝以降解效果。当焙烧温度为450℃、TiO2/GO质量比为125∶1时,制备得到的TiO2-r GO具有最优的光催化效果。In this study,graphene oxide（ GO） was prepared from natural flake graphite by the modified Hummers method. Graphene / TiO2 hybrid photocatalyst was successfully synthesized through a simple sol-gel method using TBOT（ Ti（ OC4H9）4） as Ti source. To study the effect of different preparation conditions on the photocatalytic properties of TiO2-graphene composite materials（ TiO2-r GO）,the prepared catalysts were characterized by X-ray diffraction（ XRD）,Raman spectroscopy,Brunauer-Emmett-Teller sorption（ BET）,scanning electron microscopy（ SEM）,transmission electron microscopy（ TEM）,UV-vis absorbance spectroscopy（ UVVis） and fluorescence spectra（ PL）. The as-formed TiO2 was formed in anatase phase,and can be uniformly deposited on the graphene sheet,showing the layered structure of stacked. The composite material had a large specific surface area and higher visible response comparing to pure TiO2. The photocatalytic activity of the as-prepared products was evaluated by photocatalytic decolorization of methylene blue aqueous solution at ambient temperature under ultraviolet. The experimental results indicated that TiO2-r GO composite prepared with TiO2/ GO mass ratio of 125 ∶ 1 at calcination temperature of 450℃ had the greatest photocatalytic effect.

关 键 词：TIO2 石墨烯 溶胶-凝胶法 光催化 有机污染物 

分 类 号：X703.1[环境科学与工程—环境工程]