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Adsorption behavior and photocdegradation mechanism on endocrine disrupters in the TiO_2 photocataritic degradation

TiO_2光催化降解中内分泌干扰物的吸附行为及光降解机理

基本信息

批准号：
14540544
负责人：
HIDAKA Hisao
金额：
$ 1.98万
依托单位：
Meisei University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14540544/
关键词：
Titanium dioxide Adsorption Quartz crystal microbalance Endocrine disruptor Photodegradation 薄膜

项目摘要

The endocrine disrupters such as agricultural chemicals, herbicides, plasticizers, and raw material of synthetic detergent have caused the serious problems for the ecosystem of animals. Most of these materials do not dissolve in water, and they are hydrophobic or resin-soluble. In this research, the degradation mechanism and photodegradation rate on the chemical structure of these toxic materials was investigated in TiO_2 photocatalytic system. The direct measure of temporal adsorption evidence under UV irradiation is so complicated that the dynamic adsorption behaviours have not been revealed. The adsorption reaction on the TiO_2 surface is a critical factor for the initial photocatalyst degradation. TiO_2 was fixed on the surface of the quartz crystal microbalance (QCM) to examine piezo the effect, and it was used as a sensor that measured the TiO_2 surface reaction. The adsorbed substrate on the TiO_2 thin film surface by the UV irradiation is moved to the bulk solution by the progr … More esses of photodegradation. Moreover, the intermediates are reabsorbed on the TiO_2 thin file surface. Therefore, the make of the high active TiO_2 thin film is an important key in this research.The attack position of OH radicals to the chemical structure of bisphenol A was the compared between the experimental data and the computer calculation (point charge and frontier electron density). Moreover, partial charge of the ad sorption behavior of the resolved substrate was calculated to the surface of the catalyst. A minus charge implies a big difference from the theoretical calculation in the vacuum or air and the calculation in water. Moreover, the plus charge obtains a smaller value. An actual experiment value was compared with these theoretical calculations, and the resolution mechanism was inferred from a molecular chemical structure. The experiment factors of a non-degradative material as flourine-containing material and cyanuric acid by the TiO_2 photocatalytic system were also inspected in detail. Less

农药、除草剂、增塑剂、合成洗涤剂原料等内分泌干扰物给动物生态系统造成了严重问题。大多数这些材料不溶于水，并且它们是疏水性的或可溶于树脂的。本研究在TiO_2光催化体系中研究了这些有毒物质化学结构的降解机理和光降解速率。紫外线照射下时间吸附证据的直接测量非常复杂，以至于动态吸附行为尚未揭示。 TiO_2表面的吸附反应是光催化剂初始降解的关键因素。将TiO_2固定在石英晶体微天平(QCM)表面考察压电效应,并将其作为测量TiO_2表面反应的传感器。通过紫外线照射，TiO_2 薄膜表面吸附的基材通过光降解过程转移到本体溶液中。此外，中间体在TiO_2薄锉表面上被重吸收。因此,高活性TiO_2薄膜的制备是本研究的一个重要关键。通过实验数据与计算机计算(点电荷和前沿电子密度)比较OH自由基对双酚A化学结构的攻击位置。此外，计算了解析底物吸附行为在催化剂表面的部分电荷。负电荷意味着真空或空气中的理论计算与水中的计算有很大差异。而且，正电荷获得更小的值。将实际实验值与这些理论计算值进行比较，并从分子化学结构推断解析机制。对含氟材料和氰尿酸等非降解材料的TiO_2光催化体系的实验因素进行了详细考察。较少的