Sol-gel preparation of mesoporous photocatalytic TiO2 films and TiO2/Al2O3 composite membranes for environmental applications
Sol-gel preparation of mesoporous photocatalytic TiO2 films and TiO2/Al2O3 composite membranes for environmental applications
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DOI：
10.1016/j.apcatb.2005.09.012
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发表时间：
2006-03-22
影响因子：
22.1
通讯作者：
Dionysiou, DD
中科院分区：
文献类型：
--
作者：
Choi, H;Stathatos, E;Dionysiou, DD
本研究描述了应用新型化学方法制备坚固的纳米结构二氧化钛（TiO 2）光催化剂。这种材料可以应用于开发用于水处理的高效光催化系统。介孔TiO 2光催化薄膜和膜的合成通过一个简单的合成方法，包括浸涂适当的基板到有机/无机溶胶组成的异丙醇，乙酸，四异丙氧基钛，和聚氧乙烯山梨糖醇单油酸酯表面活性剂（吐温80），然后在500 ℃煅烧的涂层。通过吸收乙酸与异丙醇酯化反应释放的水分子，实现了可控的水解和缩合反应。Ti-O-Ti网络在自组装表面活性剂上的稳定引入导致TiO 2光催化剂具有增强的结构和催化性能。该催化剂具有高比表面积（147 m2/g）和高孔隙率（46%）、窄孔径分布（2 ~ 8 nm）、均匀无裂纹和针孔、活性微晶相和小晶粒尺寸（9 nm）。这些TiO 2光催化剂是非常有效的降解亚甲基蓝和肌酐在水中。所制备的TiO 2/Al 2 O3复合光催化膜的高透水性和急剧的聚乙二醇截留率证明了TiO 2膜良好的结构性能。此外，多涂层程序使得可以有效地控制TiO 2层的物理性质，例如涂层厚度、TiO 2的量、光催化活性、水渗透性和有机物保留。(c)2005 Elsevier B. V.保留所有权利。
This study describes the application of novel chemistry methods for the fabrication of robust nanostructured titanium oxide (TiO2) photocatalysts. Such materials can be applied in the development of efficient photocatalytic systems for the treatment of water. Mesoporous photocatalytic TiO2 films and membranes were synthesized via a simple synthesis method that involves dip-coating of appropriate substrates into an organic/inorganic sol composed of isopropanol, acetic acid, titanium tetraisopropoxide, and polyoxyethylenesorbitan monooleate surfactant (Tween 80) followed by calcination of the coating at 500 degrees C. Controlled hydrolysis and condensation reactions were achieved through in-taking of water molecules released from the esterification reaction of acetic acid with isopropanol. The subsequent stable incorporation of Ti-O-Ti network onto self-assembled surfactants resulted in TiO2 photocatalysts with enhanced structural and catalytic properties. The properties included high surface area (147 m(2)/g) and porosity (46%), narrow pore size distribution ranging from 2 to 8 nm, homogeneity without cracks and pinholes, active anatase crystal phase, and small crystallite size (9 nm). These TiO2 photocatalysts were highly efficient for the destruction of methylene blue and creatinine in water. High water permeability and sharp polyethylene glycol retention of the prepared photocatalytic TiO2/Al2O3 composite membranes evidenced the good structural properties of TiO2 films. In addition, the multi-coating procedure made it possible to effectively control the physical properties of TiO2 layer such as the coating thickness, amount of TiO2, photocatalytic activity, water permeability and organic retention. (c) 2005 Elsevier B.V. All rights reserved.