通过溶胶-凝胶法制备未掺杂和铕掺杂的 TiO2空心微球,采用 XRD、SEM、TEM、HRTEM、BET和 XPS等技术对样品进行表征,以亚甲基蓝的光催化降解为目标反应,评价其光催化活性。结果表明,钛酸四丁酯(TBOT)的加入量对微球的形貌影响较大,当滴加1.5 mL的TBOT时,可得结构清晰、分散性良好的TiO2空心微球。XRD分析表明,400℃煅烧的纳米TiO2空心微球为锐钛矿,掺铕可抑制TiO2的晶相转变。光催化实验表明,铕掺杂能显著提高TiO2空心微球的活性。当铕掺量为0.7%时,所得样品粒径和孔径最小,比表面积最大,光催化活性最高。
Pure TiO2 and Eu-doped TiO2 hollow microspheres were prepared by Sol-Gel method and characterized by techniques such as XRD, SEM, TEM, HRTEM, BET and XPS. Photocatalytic degradation of methylene blue (MB) in aqueous solution was used as a probe reaction to evaluate their photocatalytic activity. The experimental results show that the dosage of TBOT has a great effect on the morphology of TiO2 hollow microspheres. When the dosage of TBOT is 1.5 mL, the obtained hollow microspheres disperse well and show clear structure. XRD pattern indicates that TiO2 hollow microspheres calcined at 400℃ present anatase structure and Eu-doped ones can restrain the anatase phase from converting to rutile phase. The experimental results suggest that Eu-doped can obviously improve the photocatalytic activity of TiO2 hollow microsphere and when the doping of Eu is 0.7%, the photocatalytic degradation reaches the best because of its highest surface area and smallest crystallize size and pore diameter.
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