混合相二氧化钛石墨烯复合物的制备及光催化性能

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1、物理化学学报(WuliHuaxueXuebao)MarchActaPhys.-Chim.Sin.2015,31(3),519-526519[Article]doi:10.3866/PKU.WHXB201412291www.whxb.pku.edu.cn混合相二氧化钛石墨烯复合物的制备及光催化性能11,2,*111于建华范闽光李斌董丽辉张飞跃(1广西大学化学化工学院,南宁530004;2广西石化资源加工及过程强化技术重点实验室,南宁530004)摘要:采用水热法制备了一系列混合相二氧化钛-石墨烯(TrG)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

2、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-VisDRS),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TiO2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TrG复合材料在紫外光下降解甲基蓝的催化活性均高于纯TiO2,且当氧化石墨烯负载量为0.8%(质量分数,w)时,复合材料TrG具有较好的光催化

3、效果.关键词:混合相TiO2;异质结;石墨烯;光电子传递;水热法;光催化中图分类号:O643;O645PreparationandPhotocatalyticActivityofMixedPhaseTiO2-GrapheneComposites11,2,*111YUJian-HuaFANMin-GuangLIBinDONGLi-HuiZHANGFei-Yue(1SchoolofChemistryandChemicalEngineering,GuangxiUniversity,Nanning530004,P.R.China;2GuangxiKeyLabor

4、atoryPetrochemicalRescourceProcessingandProcessIntensificationTechnology,Nanning530004,P.R.China)Abstract:Aseriesofcompositesconsistingofanatase-rutileTiO2andgraphene(TrG)weresynthesizedbyahydrothermalroute.Theinfluenceoftheamountofgrapheneoxideonthephotocatalyticactivityduringth

5、edegradationofmethylbluewasstudied.ThephotocatalystswerecharacterizedbyX-raydiffraction(XRD),Fouriertransforminfrared(FTIR)spectroscopy,high-resolutiontransmissionelectronmicroscopy(HRTEM),Ramanspectroscopy,ultraviolet-visiblediffusereflectancespectroscopy(UV-VisDRS),X-rayphotoel

6、ectronspectroscopy(XPS),andBrunauer-Emmett-Teller(BET)specificsurfaceareameasurements.Theresultsshowthatas-preparedTiO2formedintheanataseandrutilephasewithabarstructureanditdisperseduniformlyoverthesurfaceofthegraphenesheets.Thecompositespossesshighercatalyticactivitybecauseofthe

7、strongabsorptioncapacityofgraphene,theestablishmentofheterojunctionsbetweenrutileandanataseTiO2,theremarkableelectricaltransportbetweenTiO2andgrapheneandthehighspecificsurfaceareas.ThephotodegradationperformanceofmethylbluebytheTrGcompositesunderUVlightwasstudied.Ourresultsindica

8、tethatthephotocatalyticactivitiesoftitan