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以钛酸四丁酯(TBT)为原料,采用溶胶-凝胶法制备了纯TiO2和La3+-Pr3+共掺杂复合粉体(La3+-Pr3+/TiO2),采用XRD、UV-Vis和TEM等测试手段分析了在紫外光照射下,以降解甲基橙为探针反应研究其可见光催化性能。结果显示:所有样品均为锐钛矿相纳米TiO2,稀土元素镧和镨掺杂后TiO2特征衍射峰宽化,强度降低;与纯TiO2、镧掺杂TiO2与镨掺杂TiO2相比,光催化剂La3+-Pr3+共掺杂TiO2颗粒的粒径更小,比表面积更大,光吸收边红移程度更显著;与未掺杂和单一掺杂的TiO2相比较,共掺杂的TiO2具有更高的可见光催化性能。当La3+与TiO2和Pr3+与TiO2的摩尔比分别为1.0%和0.2%时,可见光催化性能最好。可见光催化性能的提高归因于镧和镨的协同作用。
Pure titanium and La3 + -Pr3 + co-doped composite powders (La3 + -Pr3 + / TiO2) were prepared by sol-gel method using tetrabutyl titanate (TBT) as raw material. XRD, UV- Means of analysis under ultraviolet light, the degradation of methyl orange as a probe reaction of its visible light catalytic properties. The results show that all the samples are anatase phase nano-TiO2, and the lanthanum and praseodymium rare earth doped doping TiO2 broadens the characteristic diffraction peaks and decreases the intensity. Compared with pure TiO2, lanthanum-doped TiO2 and praseodymium-doped TiO2, the photocatalyst The size of La3 + -Pr3 + co-doped TiO2 particles is smaller, the specific surface area is larger, and the red-light absorption edge is more significant. Compared with un-doped and single-doped TiO2, co-doped TiO2 has higher Visible light catalytic performance. When the molar ratios of La3 + to TiO2 and Pr3 + to TiO2 were 1.0% and 0.2%, the photocatalytic activity was the best. The improvement of visible light catalytic performance is attributed to the synergistic effect of lanthanum and praseodymium.