Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission & Ministry of Education, South-Central University for Nationalities, Wuhan 430074, China.
J Hazard Mater. 2010 Jan 15;173(1-3):539-43. doi: 10.1016/j.jhazmat.2009.08.119. Epub 2009 Aug 31.
To study the synergistic effects of hollow structure and surface fluorination on the photoactivity of TiO(2), TiO(2) hollow microspheres were synthesized by a hydrolysis-precipitate method using sulfonated polystyrene (PS) as templates and tetrabutylorthotitanate (TBOT) as precursor, and then calcined at 500 degrees C for 2h. The calcined samples were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and N(2) sorption. 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 TiO(2) hollow microspheres is significantly higher than that of TiO(2) nanoparticles 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.
为了研究中空结构和表面氟化协同效应对 TiO(2)光催化活性的影响，采用磺化聚苯乙烯（PS）为模板，四丁基钛酸酯（TBOT）为前驱体制备了 TiO(2)中空微球，然后在 500°C 下煅烧 2h。煅烧后的样品采用 X 射线衍射、扫描电子显微镜、透射电子显微镜和 N(2)吸附进行了表征。以活性艳红 X3B 作为水中的阴离子有机染料模型污染物，评估了光催化活性。结果表明，TiO(2)中空微球的光催化活性明显高于在相同实验条件下制备的 TiO(2)纳米粒子。在 pH 7 和 3 下，前者的表观速率常数分别比后者高 3.38 倍和 3.15 倍。在 pH 3 下进行表面氟化后，中空微球和纳米粒子的光活性又分别提高了 1.61 倍和 2.19 倍。表面氟化和中空结构的协同效应也可用于制备其他高效光催化剂。
