Water-dichloromethane interface controlled synthesis of hierarchical rutile TiO2 superstructures and their photocatalytic properties.
Water-dichloromethane interface controlled synthesis of hierarchical rutile TiO2 superstructures and their photocatalytic properties.
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DOI：
10.1021/ic8018138
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发表时间：
2009-01
影响因子：
4.6
通讯作者：
Changhua Wang;C. Shao;Yichun Liu;Xinghua Li
中科院分区：
文献类型：
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作者：
Changhua Wang;C. Shao;Yichun Liu;Xinghua Li
采用水-二氯甲烷界面法合成和组装金红石型TiO（2）纳米棒。在水-二氯甲烷界面处，通过水热处理TiCl（4）的二氯甲烷溶液，在无表面活性剂和模板剂的条件下，得到了分级金红石型TiO（2）超结构。通过调节反应物的摩尔比r（w）（H2 O/TiCl 4），样品的尺寸和形状发生了显著的变化。在较低的r（w）值，高度延伸，鲁棒性，多孔性，和厚的二氧化钛薄膜与有序的金红石纳米棒束沉积在界面处。在高的r（w）值下，获得由分级金红石纳米棒球和无序纳米棒组成的粉末。在大量实验的基础上提出了合理的形成机理。影响样品形貌的主要因素可能是反应体系的酸性和前驱体纳米粒子在水-二氯甲烷界面的吸附能力。结果表明，金红石型TiO（2）分级超结构对亚甲基蓝（MB）染料的光催化降解性能优于商品P25，这是由于其高比表面积和高结晶度的贡献。其他应用，如太阳能转换，环境修复和先进的光学/电学纳米器件也可以受益于分层金红石TiO（2）超结构的独特性质。
A water-dichloromethane interface is used for synthesis and assembly of rutile TiO(2) nanorods. By hydrothermal treatment of a dichloromethane solution of TiCl(4) at the interface of water-dichloromethane, turning to no surfactant or template, hierarchical rutile TiO(2) superstructures are developed. By tuning the molar ratio of reactants r(w) (H(2)O/TiCl(4)), the size and shape of the samples significantly change. At a low value of r(w), highly extended, robust, porous, and thick titania film with ordered rutile nanorod bundles are deposited at the interface. At a high value of r(w), powders consisting of hierarchical rutile nanorod spheres together with disordered nanorods are obtained. A rational formation mechanism is proposed on the basis of a range of experiments. The main factors influencing the morphologies of the samples may be attributed to the acidity of the reaction system and the adsorption ability of the precursor nanoparticles to the water-dichloromethane interface. The as-obtained rutile TiO(2) hierarchical superstructures show higher photocatalytic property to decompose methylene blue (MB) dye compared with that of commercial P25, which can be ascribed to the contribution of high surface area and high crystallinity. Other applications, such as solar energy conversion, environmental remediation, and advanced optical/electric nanodevices may also benefit from the unique properties of the hierarchically rutile TiO(2) superstructures.