载体性质对TiO2光催化反应动力学影响机理研究

项目名称： 载体性质对TiO2光催化反应动力学影响机理研究

项目编号： No.51464037

项目类型： 地区科学基金项目

立项/批准年度： 2015

项目学科： 矿业工程

项目作者： 白春华

作者单位： 内蒙古科技大学

项目金额： 34万元

中文摘要： TiO2作为光催化剂有着非常诱人的应用前景。为了进一步拓宽其应用途径，克服其纳米形态难以回收利用的缺点，同时提高其可见光响应范围，需要对TiO2进行改性和负载。理论研究表明有带隙能量、杂质分布水平、杂质性质、费米子的位置与能隙边缘的能量等多个因素影响了它的光催化反应活性。因此，要从理论上掌握其光催化本质，最重要的是对其光催化降解过程中的稳定中间体与产物进行分离、纯化、结构鉴定，然后建立其降解动力学方程。本研究以硅藻土助滤剂、白炭黑、蛋白土、粉煤灰漂珠为载体，制备稀土元素掺杂的纳米TiO2复合光催化剂，以含酚废水为降解对象，对纯纳米TiO2与负载型纳米TiO2对含酚废水的降解过程进行研究，从分子水平上来研究降解反应过程，获得量化数据，以解释纯纳米TiO2与负载型纳米TiO2光催化的动力学过程，进而揭示载体性质对纳米TiO2光催化反应动力学的影响机理。

中文关键词： 硅质载体；光催化；反应动力学；机理

英文摘要： TiO2 nano-crystalline materials with specific and special morphology has a very attractive prospect, and in order to further broaden its application, overcome the disadvantages of recycle, the nano morphology is difficult to and to improve the visible light response range, TiO2 need to be modified and supported. However, theoretical studies have shown that there is a band gap energy, impurity distribution level, the nature of impurities, fermions position bandgap energy and other edge factors affecting its photocatalytic reactivity, therefore, from the theoretical grasp the nature of its photocatalytic, the most important step is the process of photocatalytic degradation of its stable intermediates and product separation, purification, structure identification, and establish its degradation kinetics. In this study, a different carrier titanium dioxide as raw material, select compounds with different molecular weights and different nature of their degradation reaction, separation and purification process of degradation intermediates and product stability. On the basis of data obtained intermediate product structure established on the degradation of organic molecules in nano-TiO2 kinetic equation for the in-depth understanding and grasp of improving its photocatalytic reactivity provide theoretical support.

英文关键词： siliceous carrier;photocatalysis;reaction kinetics;mechanisms