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- 2016
铁铕共掺杂的TiO2空心微球的制备及光催化活性
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Abstract:
通过溶胶-凝胶法制备铁铕共掺杂的TiO2（Fe3+-Eu3+/TiO2）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：SiO2微球表面均匀地包覆了1层TiO2，超声有利于提高SiO2@TiO2复合微球间的分散性，同时也发现煅烧前对SiO2@TiO2复合微球进行研磨处理后所得的Fe3+-Eu3+/TiO2空心微球部分塌陷，而未研磨和煅烧后研磨所得Fe3+-Eu3+/TiO2空心微球完整性较好。XRD和BET分析表明，Fe3+-Eu3+/TiO2空心微球为锐钛矿且具有良好的介孔结构，铁铕共掺杂在TiO2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Fe3+的掺杂量为1.0%、Eu3+的掺杂量为0.5%时，Fe3+-Eu3+/TiO2空心微球的光催化活性最高。 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 methylene 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 without 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 microspheres, which can decrease the particle size of Fe3+-Eu3+/TiO2 hollow microspheres and and increase the specific 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. 福建省科技计划（2015H0016）；福州市科技计划（2013-G-92）；福建省高校产学合作科技重大关键资助项目（2012H6008）
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