TiO2 coating photocatalysts with nanostructure and preferred orientation showing excellent activity for decomposition of aqueous acetic acid
TiO2 coating photocatalysts with nanostructure and preferred orientation showing excellent activity for decomposition of aqueous acetic acid
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具有纳米结构和择优取向的 TiO2 涂层光催化剂对乙酸水溶液表现出优异的分解活性
DOI：
10.1007/bf00592727
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
K. Niihara
中科院分区：
文献类型：
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作者：
K. Kato;Y. Torii;H. Taoda;T. Kato;Y. Butsugan;K. Niihara
TiO 2涂层作为光催化剂、光电极和太阳能电池是很有吸引力的材料。结构修饰、量子尺寸效应和大的表面积比使得涂层很有趣。本文讨论了TiO_2涂层的晶体结构[1]、结晶度[2]和形貌[3]对光催化性能的影响，并指出由化学改性的醇盐溶液制备的TiO_2涂层具有特征结构。es [4]。在这里，我们报告的TiO 2涂层的光催化性能的化学改性醇盐的方法，具有纳米结构，并显示沿沿着c轴的择优取向。我们还报道了TiO 2涂层中的氧空位对光催化性能的影响。乙酸的分解是一个非常重要的反应，因为在分解过程中，乙酸通常生成含有两个以上碳的有机化合物。众所周知，利用氧气和光催化剂分解乙酸水溶液的过程不同于光柯尔贝反应[5]，其产物是乙烷。在乙酸水溶液与氧气的光催化分解过程中，甲醛作为中间化合物生成，并且其容易氧化成二氧化碳。化学需氧量（COD）在该过程中特征性地降低到零。因此，醋酸水溶液与氧气的光催化分解是水净化和处理的关键反应。采用化学改性醇盐法制备了TiQ涂层。该方法已在其他地方详细描述[4]。用于涂层的前体溶液由四异丙醇钛、无水乙醇、二乙醇胺、水和聚乙二醇（分子量; Mw= 2000）制备。四异丙醇钛在乙醇中的浓度为0.5摩尔dm-3。水和二乙醇胺与四异丙氧基钛的摩尔比分别为1和2。聚乙二醇对四异丙醇钛的浓度为20重量%。用浸涂法在石英玻璃板上制备的凝胶涂层，
TiO2 coatings are attractive materials for use as photocatalysts, photoelectrodes and solar cells. Structural modification, quantum size effects, and large surface-to-volume make the coatings interesting. We have described the effects of crystal strucmre [1], crystallinity [2] and morphology [3] of TiO2 coatings on photocatalytic properties, and shown that a TiO2 coating prepared from a chemically-modified alkoxide solution had characteristic structur. es [4]. Here we report the photocatalytic properties of TiO2 coatings prepared by the chemically modified alkoxide method, which have nanostructure and show preferred orientation along the c axis. We also report the effect of oxygen vacancies in the TiO2 coatings on the photocatalytic properties. Decomposition of acetic acid is a very important reaction because during decomposition acetic acid usually generates organic compounds containing more than two carbons. Decomposition of aqueous acetic acid by use of oxygen and photocatalysts is lcnown to proceed differently from the photo-Kolbe reaction [5] with a product of ethane. During the photocatalytic decomposition of aqueous acetic acid with oxygen, formaldehyde is generated as an intermediate compound and this oxidizes readily to carbon dioxide. Chemical oxygen demand (COD) decreases to zero characteristically in the process. Therefore, the photocatalytic decomposition of aqueous acetic acid with oxygen is a key reaction for purification and treatment of water. T iQ coatings were prepared by the chemically modified alkoxide method. The method has been described in detail elsewhere [4]. The precursor solution for the coatings was prepared from titanium tetraisopropoxide, anhydrous el: hanol, diethanol amine, water and polyethylene glycol (molecular weight; Mw= 2000). The concentration of titanium tetraisopropoxide in ethanol was 0.5 mol dm-3. The molar ratios of water and diethanolamine to titanium tetraisopropoxide were 1 and 2, respectively. The concentration of polyethylene glycol to titanium tetraisopropoxide was 20 wt%. Gel coating, which was prepared on a quartz glass plate by a dip-coating method, crystallized to anatase during elevation on