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时间:2020-03-27
《混合相二氧化钛石墨烯复合物的制备及光催化性能.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、物理化学学报(WuliHuaxueXuebao1MarchActaPhys.一Chim.Sin.2015,31(3),519-526519[Article]doi:l0.3866/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于建华’范闽光t李斌’董丽辉’张飞跃’(广西大学化学化工学院,南宁530004;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
2、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(FTlR)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TiO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TiO,且当氧化石墨烯负载量为0.8
3、%(质量分数,w)时,复合材料TrG具有较好的光催化效果.关键词:混合相TiO:异质结:石墨烯:光电子传递:水热法:光催化中图分类号:0643;0645PreparationandPhOtOCataIytiCActivityofMixedPhaseTiO2-GrapheneCompositesYUJian—Hua’FANMin—Guang’l'LIBin’DONGLi—HuiZHANGFei—Yue’(‘SchoolofChemistryandChemicalEngineering,GuangxiUniversity,N
4、anning530004,PR.China;GuangxiKeyLaboratoryPetrochemicalRescourceProcessingandProcessIntensificationTechnology,Nanning530004,PR.China)Abstract:Aseriesofcompositesconsistingofanatase—rutileTiO2andgraphene(TrG)weresynthesizedbyahydrothermalroute.Theinfluenceoftheamo
5、untofgrapheneoxideonthephotocatalyticactivityduringthedegradationofmethylbluewasstudied.Theph0tocatalystswerecharacterizedbyX—raydifraction(XRD),Fouriertransf0rminfrared(FTIR)spectroscopy,high-resolutiontransmissionelectronmicroscopy(HRTEM),Ramanspectroscopy,ultr
6、aviolet—visibledifusereflectancespectroscopy(UV.VisDRS),X-rayphotoelectronspectroscopy(XPS)。andBrunauer-Emmett.TeIler(BET)specificsurfaceareameasurements.Theresultsshowthatas—prepared-fiO2formedintheanataseandrutilephasewithabarstructureanditdisperseduniformlyove
7、rthesurfaceofthegraphenesheets.Thecompositespossesshighercatalyticactivitybecauseofthestrongabsorptioncapacityofgraphene,theestablishmentofheterojunctionsbetweenrutileandanataseTiO2,theremarkableelectricaltranspoRbetweenTiO2andgrapheneandthehighspecificsuceareas.
8、ThephotodegradationperformanceofmethyIbluebytheTrGcompositesunderUVlightwasstudied.Ourresultsindicacethatthephotocatalyticactivitiesoftitaniumdioxide-graphenec
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