College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou 310032, People's Republic of China.
Environ Sci Technol. 2010 May 15;44(10):3913-8. doi: 10.1021/es100456n.
TiO(2) nanomaterial is widely used for catalytic ozonation. In the present work, TiO(2) nanostructures with various morphology and crystallite phases were synthesized by a hydrothermal method, followed by calcination using Degussa P25 as precursor. The nanotube, nanorod, and nanowire forms were obtained by varying the hydrothermal temperature, and the anatase/rutile ratios were adjusted by controlling the annealing temperature. The catalytic activity of the samples was evaluated by degradation of phenol in aqueous solution in the presence of ozone. We found that the initial degradation rates (IDR) of phenol were dominated primarily by the surface OH groups. Thus, with the help of transmission electron microscopy (TEM), X-ray diffraction (XRD), and Brunauer-Emmett-Teller (BET) analyses, the number of surface OH groups per unit area of TiO(2) was correlated with the morphology and crystallite phases. Finally, we conclude that the vast surface area and higher rutile phase ratios are favorable for the catalytic ozonation of phenol and the morphology of TiO(2) had negligible effect in our experiments.
TiO(2)纳米材料被广泛应用于催化臭氧化。在本工作中，采用水热法合成了具有不同形貌和晶相的 TiO(2)纳米结构，并以 Degussa P25 为前驱体进行煅烧。通过改变水热温度得到了纳米管、纳米棒和纳米线形式，通过控制退火温度调整了锐钛矿/金红石的比例。通过在臭氧存在下降解水溶液中的苯酚来评估样品的催化活性。我们发现苯酚的初始降解速率（IDR）主要受表面 OH 基团控制。因此，借助透射电子显微镜（TEM）、X 射线衍射（XRD）和 Brunauer-Emmett-Teller（BET）分析，单位面积 TiO(2)上的表面 OH 基团数量与形貌和晶相相关。最后，我们得出结论，较大的比表面积和较高的金红石相比例有利于苯酚的催化臭氧化，而 TiO(2)的形貌在我们的实验中几乎没有影响。
