石墨烯量子点修饰TiO_2复合纳米材料的制备及其光电性能研究  

Preparation and photoelectric property of TiO_2 composite nanoparticles modified by graphene quantum dots

作　　者：陈萍 刘婷 姚凯波 袁国秋[1] 石磊 葛存旺[2] Chen Ping;Liu Ting;Yao Kaiboe;Yuan Guoqiu;Shi Lei;Ge Cunwang(School of Science,Nantong University,Nantong 226009;School of Chemistry and Chemical Engineering,Nantong University,Nantong 226009)

机构地区：[1]南通大学理学院,南通226009 [2]南通大学化学化工学院,南通226009

出　　处：《化工新型材料》2018年第8期79-84,共6页New Chemical Materials

基　　金：国家自然科学基金(61571245);校研究生创新项目(YKC15043)

摘　　要：传统的二氧化钛(TiO_2)存在一些问题,如能隙值过大只可响应紫外波段,光生电子与空穴极易在体内和表面复合。针对目前TiO_2在光催化应用中存在的不足,提出了有效提升其光催化性能的实验方案。以高比率(001)面纳米TiO_2粒子为研究对象,采用热裂解柠檬酸制备的石墨烯量子点(GQDs),在强碱水热条件下制备出GQDs修饰的海胆状TiO_2。对所制样品的形貌与结构进行表征,并利用构建好的电化学平台,分析改性修饰对TiO_2光催化性能的影响。结果表明,GQDs敏化的TiO_2显示出优异的光催化性能。Conventional titanium dioxide（TiO2）has some problems,such as high energy gap value of which only responded to ultraviolet band,and recombination of photo-generated electrons and holes both inside and on the surface.According to the research shortcoming in photocatalytic application of TiO2,a series of experimental protocols to improve the photocatalytic efficiency were mainly focused.The truncated octahedral TiO2 with high ratio（001）active facet was the study object.TiO2 stripped in alkali environment was modified by graphene quantum dots（GQDs）prepared in optimum process.The GQDs was fabricated by citric acid pyrolysis method.Then,the morphology and structure were characterized.The photocatalytic activities were characterized through electrochemical test platform to analyze the effect of GQDs in promoting the photocatalytic activity of traditional anatase TiO2.The results showed that TiO2 sensitized by GQDs performed excellent photocatalytic activity.

关 键 词：二氧化钛 石墨烯量子点 光催化活性 

分 类 号：TB383.1[一般工业技术—材料科学与工程] TQ134.11[化学工程—无机化工]