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采用溶胶-凝胶工艺,以钛酸丁酯(Ti(C4H9O)4)为前驱体,冰醋酸为螯合剂,制备了Fe3+/Zn2+复合掺杂的改性纳米TiO2粉体材料。运用X射线衍射、透射电镜、X射线光电子能谱、Fourier变换红外光谱和光吸收研究了铁锌元素掺杂对纳米TiO2相变和光催化活性的影响。结果表明:铁及锌的掺杂会降低TiO2由锐钛矿相向金红石相的转变温度;掺铁和锌能提高纳米TiO2的光催化活性;当Fe3+/Ti4+摩尔比为0.2,Fe3+/Zn2+摩尔比为0.5时,经300℃焙烧1h制备的Fe3+/Zn2+复合掺杂纳米TiO2样品的光催化活性最好;在太阳光照4h时,Fe3+/Zn2+摩尔比为0.5复合掺杂纳米TiO2样品对甲基橙的降解率可达71.43%。
A modified Fe3 + / Zn2 + doped nano-TiO2 powder was prepared by sol-gel process with Ti (C4H9O) 4 as precursor and glacial acetic acid as chelating agent. The effects of Fe and Zn doping on the phase transition and photocatalytic activity of nano-TiO2 were investigated by X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy and optical absorption. The results showed that the doping of iron and zinc reduced the transition temperature from anatase phase to rutile phase. The addition of iron and zinc increased the photocatalytic activity of TiO2. When the molar ratio of Fe3 + to Ti4 was 0.2, the molar ratio of Fe3 + to Zn2 + Is 0.5, the photocatalytic activity of Fe3 + / Zn2 + composite doped nano-TiO2 prepared by calcination at 300 ℃ for 1h is the best. Under the sunlight for 4h, the molar ratio of Fe3 + / Zn2 + The degradation rate of up to 71.43%.