硫氮共掺杂的片状镶嵌立方中空TiO_(2)纳米晶的制备及其可见光催化性能  

Fabrication of sulfur/nitrogen co-doped nanoflake inlaid with cubic hollow TiO_(2) nanocrystals and enhancing visible-light photocatalytic performance

作　　者：卢燕飞 张成江 李襄宏[1] 陈连清[1] LU Yanfei;ZHANG Chengjiang;LI Xianghong;CHEN Lianqing(College of Chemistry and Materials Science&Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education,South-Central Minzu University,Wuhan 430074,China)

机构地区：[1]中南民族大学化学与材料科学学院&催化转化与能源材料化学教育部重点实验室,武汉430074

出　　处：《中南民族大学学报（自然科学版）》2023年第3期289-299,共11页Journal of South-Central University for Nationalities：Natural Science Edition

基　　金：国家自然科学基金资助项目(52272102);人事部留学人员科技活动择优资助项目(BZY13007);湖北省杰出青年基金资助项目(2013CFA034);湖北省青年英才开发计划资助项目(RCJH15001)。

摘　　要：采用醇热法合成了具有不同掺杂能级的S/N共掺杂的片状镶嵌立方中空TiO_(2)纳米晶(SN-CHT),以提高其在可见光下的光催化活性.通过扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线衍射(XRD)、X射线光电子能谱(XPS)、傅里叶变换红外光谱(FT-IR)、紫外可见光漫反射光谱(UV-Vis DRS)、光致发光(PL)、莫特-肖特基和RhB降解实验,研究了所制备样品的形态、光学和光催化性能.结果表明:甲硫氨酸含量为0.25 g的SN-CHT样品表现出最优异的光催化活性,是纯立方中空TiO_(2)纳米晶的3.17倍.RhB的可见光降解率在90 min后可以达到99.9%,其一阶动力学常数为0.86×10^(-2) min^(-1).其可见光催化活性主要归因于引入硫和氮元素后形成的新的掺杂能级和变窄TiO_(2)的带隙促进了光生电子-空穴对的分离,这在莫特-肖特基图和Tauc图中得到了证实.故用S/N元素共同修饰立方体空心TiO_(2)纳米晶是一种能提高光催化性能的有前景的方法.S/N co-doped nanoflakes inlaid with cubic hollow TiO_(2) nanocrystals(SN-CHT)with different doping level were synthesized by alcohol-thermal method for promoting the photocatalytic activity in visible-light.The morphology,optical and photocatalytic behavior of as-prepared samples were studied by scanning electron microscopy(SEM),transmission electron microscopy(TEM),X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),Fourier Transform infrared spectroscopy(FT-IR),UV-Vis diffuse reflectance spectroscopy(UV-Vis DRS),Photoluminescence(PL),Mott-Schottky and RhB degradation experiments.The results demonstrated that the SN-CHT samples with an optimum methionine content of 0.25 g exhibited the highest photocatalytic activity,which was 3.17 times that of the pristine cubic hollow TiO_(2) nanocrystals.The visible-light degradation rate of RhB reached 99.9%after 90 min and the first-order kinetic constant was 0.86×10^(-2) min^(-1).The visible-light photocatalytic activity was mainly attributed to the formation of a new doping level and the narrowing of the band gap of TiO_(2) after the introduction of sulfur and nitrogen,which promoted the separation of photogenerated electron-hole pairs,as confirmed by the Mott-Schottky plot and Tauc plot.Overall,co-modification of cubic hollow TiO_(2) nanocrystal with S/N elements showed promising future for improving photocatalytic performance.

关 键 词：片状镶嵌立方中空TiO_(2)纳米晶 醇热法 S/N共掺杂 可见光催化 

分 类 号：O622.6[理学—有机化学]