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通过溶胶-凝胶法制备铁铕共掺杂的TiO_2(Fe~(3+)-Eu~(3+)/TiO_2)空心微球,采用XRD、TEM、BET和XPS等对样品进行表征,以亚甲基蓝(MB)的光催化降解为目标反应,评价其光催化活性。结果表明:SiO_2微球表面均匀地包覆了1层TiO_2,超声有利于提高SiO_2@TiO_2复合微球间的分散性,同时也发现煅烧前对SiO_2@TiO_2复合微球进行研磨处理后所得的Fe~(3+)-Eu~(3+)/TiO_2空心微球部分塌陷,而未研磨和煅烧后研磨所得Fe~(3+)-Eu~(3+)/TiO_2空心微球完整性较好。XRD和BET分析表明,Fe~(3+)-Eu~(3+)/TiO_2空心微球为锐钛矿且具有良好的介孔结构,铁铕共掺杂在TiO_2空心微球中产生协同作用,使Fe3+-Eu3+/TiO2空心微球的粒径进一步减小,比表面积增大。当Fe~(3+)的掺杂量为1.0%、Eu~(3+)的掺杂量为0.5%时,Fe~(3+)-Eu~(3+)/TiO_2空心微球的光催化活性最高。
The hollow microspheres doped with europium-co-doped TiO 2 (Fe 3+ -Eu 3+ / TiO 2) were prepared by sol-gel method. The samples were characterized by XRD, TEM, BET and XPS. The photocatalytic degradation of methylene blue (MB) was the target reaction, and its photocatalytic activity was evaluated. The results showed that one layer of TiO 2 was uniformly coated on the surface of SiO 2 microspheres, and the dispersibility of SiO 2 @ TiO 2 composite microspheres was improved by ultrasound. At the same time, the dispersion of SiO_2 @ TiO_2 composite microspheres was also found after calcination The hollow microspheres of ~ (3 +) - Eu ~ (3 +) / TiO_2 partially collapsed, but the integrity of Fe ~ (3 +) - Eu 3+ / TiO 2 hollow microspheres . The results of XRD and BET showed that the hollow microspheres of Fe ~ (3 +) - Eu ~ (3 +) / TiO_2 were anatase and had a good mesoporous structure. The co-doping of europium co-doped TiO_2 hollow microspheres resulted in a synergistic effect , So that Fe3 + -Eu3 + / TiO2 hollow microspheres further reduce the particle size, the specific surface area increases. When the amount of doped Fe 3+ is 1.0% and the amount of Eu 3+ doped is 0.5%, the light of Fe 3+ -Eu 3+ / TiO 2 hollow microspheres The highest catalytic activity.