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Synthesis of Titania Pillared Clays and Its Application for Photocatalyst

二氧化钛柱状粘土的合成及其光催化剂应用

基本信息

批准号：
10650821
负责人：
KITAYAMA Yoshie
金额：
$ 1.86万
依托单位：
NIIGATA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

项目摘要

The preparation of TiO_2-pillared clays was carried out in an dilute acetic acid solution to prevent the pollution of the environment and the decomposition of the clay itself. The titanium organic complex was formed by the reaction between titanium tetra-isopropoxide and acetic acid. The intercalation of titanium organic complex into the interlayer of clays was carried out in an aqueous solution of acetic acid. TiO_2-pillared clays, such as aconite, mica and montmorillonite, were prepared by the calcinations of the titanium organic complex intercalated into the interlayer of clays. Characterizations of the products were carried out by measurements of XRD, XPS, surface area, pore size distribution. The TiO_2-pillared clays obtained in this study showed high surface areas and homogeneous pore size distributions. ZrO_2-pillared clays and Ti_xZr_<1-x>O_2 could be obtaind by the same preparation method as TiO_2-pillared claysPhotocatalytic activity of the TiO_2-pillared clays were studied for the oxidation of benzene which was suspended in water. Catechol was produced predominantly in the photocatalytic oxidation of benzene by using TiO_2 alone. On TiO_2-pillared mica, after phenol and catechol were produced in the initial stage of the reaction, mareic acid was formed predominantly with an increase of reaction time. On TiO_2-pillared aconite, phenol and hydroquinon were produced, then mareic acid increased with an increase of reaction time. TiO_2-pillared montmorillonite showed different catalytic activity. Resosinol and phenol were predominantly. These results indicate that the reaction path of benzene photoxidation may be attributed to property of the clay itself pillaring with TiO_2.

为防止环境污染和粘土本身的分解，在稀醋酸溶液中进行了二氧化钛柱撑粘土的制备。钛有机络合物是由四异丙醇钛与冰醋酸反应生成的。在冰醋酸水溶液中，钛有机络合物插层粘土的层间。采用钛有机络合物插层法制备了乌头、云母、蒙脱石等TiO2柱撑粘土。通过X射线衍射仪、X射线光电子能谱、比表面积、孔径分布等测试手段对产物进行了表征。所制得的二氧化钛柱撑粘土具有较高的比表面积和均匀的孔径分布。采用与制备TiO2光催化剂相同的制备方法，可制得ZrO2柱撑粘土和TixZr1-x&Gt；O2。研究了TiO2柱撑土对水中苯的光催化氧化活性。在单独使用TiO2光催化氧化苯的过程中，主要生成邻苯二酚。在二氧化钛柱撑云母上，反应初期生成苯酚和邻苯二酚后，随着反应时间的延长，主要生成顺丁烯二酸甲酯。在二氧化钛柱撑乌头上，生成苯酚和对苯二酚，顺丁烯二酸随反应时间的延长而增加。TiO2柱撑蒙脱石表现出不同的催化活性。主要成分为甲酚和苯酚。这些结果表明，苯光氧化的反应途径可能与粘土本身负载二氧化钛的性质有关。