Impacts of Morphology and Crystallite Phases of Titanium Oxide on the Catalytic Ozonation of Phenol
Impacts of Morphology and Crystallite Phases of Titanium Oxide on the Catalytic Ozonation of Phenol
复制标题
二氧化钛形貌和晶相对苯酚催化臭氧化的影响
DOI：
10.1021/es100456n
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发表时间：
2010-05-15
影响因子：
11.4
通讯作者：
Chen, Jianmeng
中科院分区：
文献类型：
--
作者：
Song, Shuang;Liu, Zhiwu;Chen, Jianmeng
TiO（2）纳米材料在催化臭氧化中有着广泛的应用。以Degussa P25为前驱体，采用水热法合成了不同形貌和晶相的TiO（2）纳米结构。通过改变水热温度得到纳米管、纳米棒和纳米线的形式，并通过控制退火温度来调节金红石/金红石的比例。通过臭氧存在下苯酚水溶液的降解反应评价了样品的催化活性。我们发现，苯酚的初始降解速率（IDR）主要由表面OH基团。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，TiO（2）的单位面积表面OH基团的数量与形貌和微晶相相关联。结果表明，TiO 2的大比表面积和较高的金红石相比例有利于催化臭氧氧化苯酚，而TiO 2的形貌对催化臭氧氧化苯酚的效果影响不大。
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.