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利用酸催化的溶胶-凝胶法合成了一系列不同掺杂量的Fe3+/TiO2、Cr3+/TiO2纳米复合微粒。用XRD和TEM研究了Fe3+、Cr3+的掺杂对TiO2纳米粒子尺寸和相结构的影响。结果表明:掺杂离子不同,对TiO2纳米粒子尺寸和相结构的影响不同。在所研究的掺杂量范围内(x:0.0000~0.1000),TiO2纳米粒子的粒径随Cr3+掺杂量的增加呈减小的趋势,但幅度不大;而Fe3+的掺杂则会引起TiO2粒子的团聚和晶粒的长大;由XRD分析可知:在掺杂量范围内,不会发生Fe2O3、Cr2O3等相的偏析,但Fe3+的掺杂引起了TiO2在低温条件下由锐钛矿向金红石的相转变。通过UV-Vis光谱的研究发现:Fe3+、Cr3+的加入,可以使TiO2对光的吸收拓展到可见区,同时随着掺杂量的增加,对可见光的吸收强度显著增强。
A series of Fe3 + / TiO2, Cr3 + / TiO2 nanocomposite particles with different doping amounts were synthesized by acid-catalyzed sol-gel method. The effects of Fe3 + and Cr3 + doping on the size and phase structure of TiO2 nanoparticles were investigated by XRD and TEM. The results show that different doping ions have different effects on the size and phase structure of TiO2 nanoparticles. In the studied doping amount range (x: 0.0000 ~ 0.1000), the size of TiO2 nanoparticles tends to decrease with the increase of Cr3 + doping amount, but the range is not large; while the doping of Fe3 + Particle agglomeration and grain growth; XRD analysis shows that: within the range of doping, the segregation of Fe2O3, Cr2O3 and other phases will not occur, but the doping of Fe3 + causes the TiO2 to grow from anatase to The transformation of rutile phase. The results of UV-Vis spectroscopy show that the addition of Fe3 + and Cr3 + can make the absorption of TiO2 extend to the visible region. At the same time, the absorption of visible light increases with the increase of doping amount.