摘要
采用溶胶-凝胶法制备了氟、锌共掺杂TiO2纳米晶光催化剂,分别利用X射线衍射(XRD)、透射电子显微镜(TEM)、X射线光电子能谱(XPS)和紫外-可见(UV-Vis)漫反射光谱对样品进行表征,并通过降解亚甲基蓝实验评估了样品的光催化性能。XRD与TEM表征结果表明,样品为锐钛矿相,平均粒径约16nm。掺杂后,样品光吸收性能未得到显著改善,但其光催化活性却得到显著提高。掺杂离子F-有利于光催化反应过程中羟基自由基的形成,样品光催化活性因而得到显著提高;共掺杂样品中,随着Zn掺杂量的增加,样品光催化活性呈现先增加后减小的变化趋势,Zn掺杂量为2%时,共掺杂样品的光催化性能最佳。
Fluorine and zinc co-doped nanocrystalline TiO2 were prepared by the sol-gel method and investigated by X-ray diffraction (XRD),transmission electron microscopy (TEM),X-ray photoelectron spectroscopy (XPS)and ultraviolet-visible (UV-Vis)diffuse reflectance spectroscopy,respectively.The photocatalytic per-formances of the samples were evaluated by photocatalytic degrading methylene blue.The XRD and TEM re-sults show that all the samples are compose of the anatase phase and the average grain sizes are about 1 6 nm. After the dopings,the absorption properties of the samples can not be obviously enhanced,but the photocata-lytic properties of the samples are all improved.The introduction of F- was beneficial to formation of hydroxyl radicals,resulting in the obvious photocatalytic activity enhancement of the sample.With the increase of Zn do-ping level,the photocatalytic activities of the codoped samples increase and then decrease,gradually.The best photocatalytic property was presented in the codoped sample with 2% Zn doping level.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2014年第16期16125-16129,共5页
Journal of Functional Materials
基金
国家自然科学基金资助项目(51372069)
河南省科技厅科技攻关重点资助项目(122102210229)
河南大学省部共建资助项目(SBGJ090505)
河南大学自然科学基金资助项目(2011YBZR022)
关键词
纳米晶TiO2
共掺杂
亚甲基蓝
光催化活性
Aromatic compounds
Doping (additives)
Photocatalysis
Sol
gel process
Sol
gels
Titanium dioxide
Transmission electron microscopy
X ray diffraction
Zinc