Synergistic effects of hollow structure and surface fluorination on the photocatalytic activity of titania.
Synergistic effects of hollow structure and surface fluorination on the photocatalytic activity of titania.
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DOI：
10.1016/j.jhazmat.2009.08.119
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发表时间：
2010-01
影响因子：
13.6
通讯作者：
K. Lv;Jiaguo Yu;Kejian Deng;Jie Sun;Yanxi Zhao;D. Du;Mei Li
中科院分区：
文献类型：
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作者：
K. Lv;Jiaguo Yu;Kejian Deng;Jie Sun;Yanxi Zhao;D. Du;Mei Li
为了研究空心结构和表面氟化对TiO2光活性的协同作用，以磺化聚苯乙烯（PS）为模板，四丁基硫钛酸酯（TBOT）为前驱体，采用水解沉淀法合成了TiO2空心微球，并在500℃下煅烧2h。通过x射线衍射、扫描电镜、透射电镜和氮气吸附对煅烧后的样品进行了表征。以阴离子有机染料活性艳红X3B为模型污染物，对水中的光催化活性进行了评价。结果表明，空心tio2微球的光催化活性明显高于相同实验条件下制备的tio2纳米颗粒。在pH为7和3时，前者的表观速率常数分别是后者的3.38和3.15倍。在pH 3下表面氟化后，空心微球和纳米颗粒的光活性分别提高了1.61倍和2.19倍。表面氟化与中空结构的协同作用也可用于制备其他高效光催化剂。
To study the synergistic effects of hollow structure and surface fluorination on the photoactivity of TiO2, TiO2hollow microspheres were synthesized by a hydrolysis–precipitate method using sulfonated polystyrene (PS) as templates and tetrabutylorthotitanate (TBOT) as precursor, and then calcined at 500°C for 2h. The calcined samples were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and N2sorption. Photocatalytic activity was evaluated using reactive brilliant red X3B, an anionic organic dye, as a model pollutant in water. The results show that the photocatalytic activity of TiO2hollow microspheres is significantly higher than that of TiO2nanoparticles prepared in the same experimental conditions. At pH 7 and 3, the apparent rate constants of the former exceed that of the latter by a factor of 3.38 and 3.15, respectively. After surface fluorination at pH 3, the photoactivity of hollow microspheres and nanoparticles further increases for another 1.61 and 2.19 times, respectively. The synergistic effect of surface fluorination and hollow structure can also be used to prepare other highly efficient photocatalyst.