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采用化学沉淀法制备La~(3+)掺杂TiO_2粉体,并用正交实验方法对制备工艺进行优化,通过SEM、XRD、XPS和UV-Vis对TiO_2粉体的形貌、结构、光吸收性能进行了表征。结果表明:煅烧温度和La~(3+)掺杂量对TiO_2粉体光吸收性能具有显著影响;不同煅烧温度得到的La~(3+)掺杂TiO_2均以锐钛矿结构为主;升高煅烧温度可以增强La~(3+)掺杂TiO_2在紫外光波段的吸光强度;La~(3+)掺杂可以改善TiO_2粉体的团聚,减小TiO_2的禁带宽度,同时导致TiO_2表面吸附一定数量的羟基。最优的制备条件为:煅烧温度800℃,La~(3+)掺杂量0.6%(摩尔分数),反应温度为90℃,反应液pH值为8,此条件下获得的TiO_2粉体可见光性能最优。
La 3 doped TiO 2 powders were prepared by chemical precipitation method and the preparation process was optimized by orthogonal experiment. The morphology, structure and optical absorption of TiO 2 powders were studied by SEM, XRD, XPS and UV-Vis Performance was characterized. The results show that the calcination temperature and La 3+ doping amount have a significant effect on the optical absorption of TiO 2 powders. The La 3+ doped TiO 2 powders are mainly anatase at different calcination temperatures. The high calcination temperature can enhance the absorption of La 3+ doped TiO 2 in the ultraviolet region. La 3+ doping can improve the agglomeration of TiO 2 and decrease the band gap of TiO 2, A certain amount of hydroxyl adsorption. The optimal preparation conditions are as follows: the calcination temperature is 800 ℃, the doping amount of La 3+ is 0.6%, the reaction temperature is 90 ℃ and the pH value of the reaction solution is 8. Under this condition, Optimal performance.