NaBH4还原改性TiO2(B)及光催化性能研究  

TiO2(B)Modified by NaBH4 and Photocatalytic Performance Study

作　　者：宜周翔 王现英[1] 张加加 YI Zhouxiang;WANG Xianying;ZHANG Jiajia(School of Materials Science and Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海理工大学材料科学与工程学院,上海200093

出　　处：《有色金属材料与工程》2020年第2期21-26,共6页Nonferrous Metal Materials and Engineering

基　　金：国家自然科学基金青年基金资助项目(51602197);上海市科学委员会浦江人才项目(16PJ1407700)。

摘　　要：以TiCl4为原料,在(CH2OH)2溶液中通过一步水热法制备单斜相二氧化钛[TiO2(B)]。使用不同质量含量NaBH4对TiO2(B)进行还原改性,调控其内含Ti3+的浓度,合成了含Ti^3+的TiO2(B)-NaBH4X样品。采用X射线衍射仪(X-ray diffraction,XRD)、拉曼光谱仪(Raman spectroscopy)、紫外-可见漫反射光谱仪(UV-visible diffuse reflectance spectroscopy,UV-DRS)、X射线光电子能谱仪(X-ray photoelectron spectroscopy,XPS)对材料进行表征。改性后TiO2(B)-NaBH4X样品保持其原有晶体结构,并未发生相变,仅有结晶度的改变。原始TiO2(B)禁带宽度为3.15 eV,通过改性,Ti^3+的存在改变了禁带宽度,成功地将禁带宽度降低到2.82 eV,将吸光区域扩展到可见光区域。通过可见光光催化分解水制氢与可见光降解甲基橙试验,确立了TiO2(B)-NaBH43样品有最好的可见光光催化活性,产氢速率达到0.58μmol·h^-1·g^-1,6 h降解率达到40%。Using TiCl4 as raw materials,monoclinic titanium dioxide[TiO2(B)]was prepared by onestep hydrothermal method in ethylene glycol solution.The TiO2(B)-NaBH4X samples containing Ti^3+were synthesized by reducing and modifying TiO2(B)with different quality of NaBH4 and adjusting the concentration of Ti^3+.The materials were characterized by X-ray diffraction(XRD),Raman spectroscopy,UV-visible diffuse reflectance spectroscopy(UV-DRS)and X-ray photoelectron spectroscopy(XPS).After modification,the TiO2(B)-NaBH4X keeps the original crystal structure without phase transformation,and only the crystallinity is changed.The band gap of original TiO2(B)is 3.15 eV.By modifying,the exist of Ti^3+changes the band gap,and successfully reduces it to 2.82 eV.The light absorption region is extended to the visible light.The best photocatalytic activity of TiO2(B)-NaBH43 was determined by the experiments of visible light photocatalytic decomposition of water to produce hydrogen and visible light degradation of methyl orange.The hydrogen production rate is 0.58μmol·h^?1·g^?1,and the degradation rate reaches 40%in 6 h.

关 键 词：TIO2 Ti^3+掺杂 光催化 产氢 

分 类 号：X52[环境科学与工程—环境工程]