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被以下文章引用:
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标题:
LiF修饰TiO2改善可见光催化性能研究Visible Light Photocatalytic Performance of Lithium Fluoride Modified TiO2
作者:
刘浩, 余大凤, 鲍钰文, 高云, 夏晓红
关键字:
LiF, TiO2, 光催化, 水热法Lithium Fluoride; Titanium Dioxide; Photocatalysis; Hydrothermal Method
期刊名称:
《Hans Journal of Nanotechnology》, Vol.4 No.1, 2014-02-24
摘要:
LiF中Li离子具有较高活性，F离子具有较大电负性，可用来修饰TiO2光催化剂以提高其在可见光下的光催化性能。TiO2粉末与LiF溶液水热反应得到样品，用X射线衍射(XRD)、透射电子显微镜(TEM)、X射线光电子谱(XPS)等分析手段进行表征，发现所制备样品为锐钛矿TiO2晶体，未检测到LiF晶体的存在，表明LiF是以离子形式存在。修饰后的样品具有可见光光催化活性，在可见光照射下可有效降解亚甲基蓝染料，当LiF与TiO2的摩尔比为1:1的时候，样品的光催化活性最好，250分钟降解率能够达到百分之八十。XPS进一步分析发现，修饰后样品中存在的表面吸附羟基和F离子是提高TiO2可见光催化效率的根本原因。
LiF was used to modify the photocatalytic property of TiO2powders considering the special functionality of Li and F ions. The sample is obtained by hydrothermal method using TiO2 powder and LiF solution with different mole ratios. The samples were analyzed by X-ray diffraction (XRD), transmission electron microscopy (TEM) and X-ray photoelectron spectrometer (XPS). XPS results showed that F ions exist in the samples, no Li ion was detected due to the measuring limitation of XPS. Photocatalytic property of the samples was tested by the degradation of methyl blue. The best photocatalytic activity was realized with LiF and TiO2 molar ratio of 1:1, the degradation rate is nearly eighty percent after 250 minutes. XPS results revealed that the hydroxyl groups and F ions on the surface of TiO2 played important roles in the improvement of photocatalytic efficiency.