铁铕共掺杂的TiO_2空心微球的制备及光催化活性

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。

Preparation and photocatalytic activity of Fe3+ and Eu3+ co-doped TiO2 hollow microspheres

Fe3+ and Eu3+ co-doped TiO2 (Fe3+-Eu3+/TiO2 )hollow microspheres were prepared by the sol-gel method and characterized by techniques such as XRD,TEM,BET and XPS etc.Photocatalytic degradation of meth-ylene blue (MB)was used as a probe reaction to evaluate their photocatalytic activity.The results show that the surface of SiO2 microspheres evenly coated with a layer of TiO2 and the treatment ultrasound is beneficial to improve the dispersion of the SiO2@TiO2 composite microspheres.Part of the Fe3+-Eu3+/TiO2 hollow microspheres were collapse,which were obtained through grinding before alcining the SiO2@TiO2 composite microspheres.While the better structural integrity of Fe3+-Eu3+/TiO2 hollow microspheres were prepared by grinding after calcining or with-out grinding.XRD and BET analysis indicate that Fe3+-Eu3+/TiO2 hollow microspheres exist in the form of anatase and have good mesoporous structure.The co-doping of Fe3+ and Eu3+ shows a synergistic effect in TiO2 hollow mi-crospheres,which can decrease the particle size of Fe3+-Eu3+/TiO2 hollow microspheres and and increase the specif-ic surface area.When the doping content of Fe3+ and Eu3+ is 1.0% and 0.5% respectively,Fe3+-Eu3+/TiO2 hollow microspheres exhibit the best photocatalytic activity.