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题名	光诱导原位聚合制备多孔TiO2薄膜及其光催化性能研究
作者	许荣国
学位类别	硕士
答辩日期	2008-05-20
授予单位	中国科学院过程工程研究所
授予地点	过程工程研究所
导师	王丹
关键词	二氧化钛 多孔薄膜 光诱导聚合 光催化性能
其他题名	Preparation of Porous TiO2 Films by Photo-Induced in situ Polymerization and Their Photocatalytic Properties
学位专业	化学工程
中文摘要	TiO2具有优良的化学稳定性和生物相容性，其催化活性高、光氧化性能好、价格低廉，被认为是最具应用潜力的半导体光催化材料，但目前应用中TiO2颗粒易团聚、难回收。多孔TiO2薄膜既克服了TiO2颗粒分离回收难的问题，同时多孔结构利于反应物的吸附、扩散，可有效提高催化剂活性，因此研究制备高催化活性多孔TiO2薄膜具有重要的应用价值和理论意义。 本文在TiO2前驱体溶胶中引入光敏有机单体和高分子，提拉制膜后利用紫外光（UV）辐照，原位诱发膜层中单体的聚合及单体和高分子的接枝反应，再经热处理得到网状多孔TiO2薄膜。薄膜为TiO2锐钛矿相，膜厚约1.3 μm，其形貌是三维网状骨架构成的多孔结构，孔道尺寸在200 nm-1.5 μm之间，网状骨架是由25 nm左右的TiO2纳米粒子组成，骨架直径约150 nm。 系统地考察了前驱体溶胶的配比、提拉制膜的条件以及薄膜的后续热处理条件等对多孔TiO2薄膜形貌的影响。提出了光诱导聚合制备网状多孔TiO2薄膜的机理，认为UV辐照诱导有机单体（POGTA）和高分子（PVP）的接枝反应与混合溶剂（EtOH-DMF）的缓慢挥发共同作用，可能是TiO2薄膜网状多孔结构形成的动力和原因。 经研究发现，前驱体溶胶配比直接影响着TiO2薄膜的微观结构，进而影响薄膜的光催化性能。通过正交实验，调节前驱体溶胶配比，制备了具有各种微结构的TiO2薄膜，并研究了薄膜的光催化性能。经优化制备条件得到了光催化性能最佳的网状多孔TiO2薄膜，其光催化降解亚甲基蓝（MB）的一级反应速率常数为-0.00744 min-1，220 min时MB的降解率达到了82.46%。
英文摘要	Due to high photocatalytic activity, superior photo-oxidation ability, low cost, good chemical stability and biological compatibility, TiO2 has been deemed as one of the most potential semiconductor photo-catalysts. In practical application, porous TiO2 film is most suitable, which not only overcomes the difficulties in particles, such as agglomeration, reuse of TiO2, but also improves the activity of catalyst by promoting the adsorption and diffusion of reactants in the porous architecture. Therefore, it is of great practical value and scientific significance to develop and study porous TiO2 film with excellent performance in photocatalysis. In this work, porous titania gel films were fabricated by UV irradiation induced in situ polymerization of organic monomer and graft-polymerization to macromolecule in the fresh films, which were dip-coated from the precursor sol with organic photosensitive monomer and macromolecule added. Further by calcinations, porous TiO2 films with net-like framework were prepared. The as-prepared TiO2 films are anatase phase with thickness of ~1.3 μm, whose morphology is three dimensional net-like framework with pore opening between 200 nm -1.5 μm. And the diameter of the net-like framework is about 150 nm, which is composed of TiO2 nanoparticles with size of ~25 nm. The influences of experimental parameters on the morphologies of the as-prepared TiO2 films, such as the composition of the precursor sol, the conditions of dip-coating and calcinations, were systematically investigated. And a tentative mechanism was proposed to elucidate the preparation of porous TiO2 film with net-like framework by photo induced polymerization. The synthetic key factors are proved to be the graft-polymerization of organic monomer (POGTA) to macromolecule (PVP) induced by UV irradiation and the slow evaporation of mixed solvent (EtOH-DMF). The photocatalytic properties of the as-prepared TiO2 films depend on their microstructure, which could be directly controlled by the composition of the precursor sol. Therefore, photocatalytic degradation of methylene blue (MB) with TiO2 films prepared from the precursor sol with different compositions were orthogonally examined. By optimizing the synthesis conditions, the TiO2 film with improved photocatalytic property exhibits the higher degraded ratio of MB in 220min of 82.46%, and the photocatalytic first-order reaction fitted constant of 0.00744min-1.
语种	中文
公开日期	2013-09-13
页码	87
内容类型	学位论文
源URL	[http://ir.ipe.ac.cn/handle/122111/1204]
专题	过程工程研究所_研究所（批量导入）
推荐引用方式 GB/T 7714	许荣国. 光诱导原位聚合制备多孔TiO2薄膜及其光催化性能研究[D]. 过程工程研究所. 中国科学院过程工程研究所. 2008.

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