College of Materials Science and Engineering, Harbin University of Science and Technology, 4#, Linyuan Road, Xiangfang, Harbin 150040, China.
J Hazard Mater. 2010 Mar 15;175(1-3):658-65. doi: 10.1016/j.jhazmat.2009.10.059. Epub 2009 Oct 27.
The existence of 'electrostatic poles' on the schorl surface encouraged us to apply schorl for a TiO(2) support. TiO(2)/schorl composite photocatalyst was prepared and characterized by XRD, SEM and UV/DRS, and their photocatalytic activity was evaluated by discoloration of acid fuchsine (AF). The results indicated that TiO(2) existed in the form of anatase and was well deposited and enwrapped on the schorl surface. The absorption edge of TiO(2)/schorl exhibited a slight red shift in the UV/DRS spectra, compared with that of pure TiO(2). The photocatalytic activity of TiO(2)/schorl for AF discoloration was higher than that of pure TiO(2). The AF discoloration ratio approached 100% after irradiation time of 12h. The optimum photocatalyst was found to be that containing 4.76 wt.% of schorl and sintered at 550 degrees C. The reaction followed pseudo-first-order kinetics, discussed by the Langmuir-Hinshelwood model. Hypotheses were proposed to interpret the mechanism for the enhanced photocatalytic activity of TiO(2)/schorl.
碧玺表面存在“静电极”这一现象促使我们将碧玺应用于 TiO(2)载体。采用 XRD、SEM 和 UV/DRS 对 TiO(2)/碧玺复合光催化剂进行了表征，并通过酸性品红（AF）的褪色评价了其光催化活性。结果表明，TiO(2)以锐钛矿的形式存在，且很好地沉积和包裹在碧玺表面。与纯 TiO(2)相比，TiO(2)/碧玺的紫外/可见漫反射光谱的吸收边略有红移。TiO(2)/碧玺对 AF 褪色的光催化活性高于纯 TiO(2)。经 12h 照射后，AF 的褪色率接近 100%。发现当碧玺含量为 4.76wt.%且在 550°C 下烧结时，催化剂的性能最佳。通过 Langmuir-Hinshelwood 模型对反应进行了拟一级动力学讨论。提出了一些假设来解释 TiO(2)/碧玺光催化活性增强的机理。
