Synthesis of Titania Pillared Clays in An Aqueous Solution of Organic Acid and Its Application for Functional Material

有机酸水溶液中二氧化钛柱状粘土的合成及其在功能材料中的应用

基本信息

批准号：
11555235
负责人：
KITAYAMA Yoshie
金额：
$ 6.66万
依托单位：
NIIGATA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11555235/
关键词：
titania pillared days soft synthesis montmorillonite saponite mica photocatalysts for partial oxidation photocatalysts for organochroline pesticide UV protector of cosmetics 化粧品紫外線遮蔽剤マイカ表面積細孔分布光触媒紫外線遮蔽剤酢酸滴下法

项目摘要

From the environmental point of view, the soft synthetic methods of TiO_2-pillared and ZrO_2-pillared clays, such as montmorillonite, saponite and mica, have been studied in a dilute aqueous solution of acetic acid, since TiO_2-pillared clays have been usually prepared in HCl solution which brings environmental hazards due to its high reactivity and stimulus. Utilizations of the synthesized TiO_2-pillared clays were investigated.(1) We found that TiO_2-pillared mica showed extremely high activity for the complete photodecomposition of organochlorine pesticides, especially for a photodecomposition of y-hexaxhrolo-cyclohexane that could not be decomposed by TiO_2 photocatalyst alone. The high activity of TiO_2-pillared mica is attributed to its affinity for y-hexaxhrolo-cyclohexane.(2) Characteristic photocatalytic properties of TiO_2-pillared clays were observed in oxidation of benzene and decomposition of carboxylic acids.In oxidation of benzene, catechol was produced predominantly by using TiO_2 alone. On the other hand, by using TiO_2-pillared mica and TiO_2-pillared saponite catalysts, maleic acid was successively produced via phenol and catechol formation. TiO_2-pillared montmorillonite showed different catalytic activity. Resosinol and phenol were predominantly produced. These results indicate that the reaction path of benzene photo-oxidation may be attributed tfc property of the clay itself pillaring with TiO_2.In photocatalytic decomposition of organic acids, dependency of molecular size of organic acid on the catalytic activity of TiO_2-pillared clays was investigated. The photocatalytic activity of TiO_2-pillared clays decreased with an increase of the molecular size of the carboxylic acid. Since the photocatalytic activity of TiO_2-pillared saponite shows the lowest activity for the decomposition of carboxylic acids, TiO_2-pillared saponite can be possible to use as an effective UV protector of cosmetics.

从环境角度考虑,由于TiO_2柱撑粘土通常是制备的,因此在稀乙酸水溶液中研究了TiO_2柱撑粘土和ZrO_2柱撑粘土(蒙脱石、皂石、云母)的软合成方法。在HCl溶液中，由于其高反应性和刺激性而带来环境危害。对所合成的TiO_2柱撑粘土的应用进行了研究。(1)我们发现TiO_2柱撑云母对有机氯农药的完全光分解表现出极高的活性,特别是对TiO_2不能分解的γ-六六并环己烷的光分解活性。单独使用光触媒。 TiO_2柱撑云母的高活性归因于其对γ-六六咯环己烷的亲和力。(2)观察了TiO_2柱撑粘土在苯氧化和羧酸分解中的特征光催化性能。主要由TiO_2单独生产。另一方面，采用TiO_2柱撑云母和TiO_2柱撑皂石催化剂，通过苯酚和儿茶酚的形成依次制备马来酸。 TiO_2柱撑蒙脱土表现出不同的催化活性。主要生产间苯二酚和苯酚。这些结果表明苯光氧化的反应路径可能归因于TiO_2柱撑粘土本身的tfc特性。在有机酸的光催化分解中,研究了有机酸分子尺寸对TiO_2柱撑粘土催化活性的依赖性。。 TiO_2柱撑粘土的光催化活性随着羧酸分子尺寸的增大而降低。由于TiO_2柱撑皂石的光催化活性对羧酸的分解活性最低，因此TiO_2柱柱皂石可以用作化妆品的有效紫外线防护剂。