Fundamental Studies of Photocatalysis on TiO2 Surfaces

二氧化钛表面有机分子的光催化氧化有望成为修复有机污染地下水和破坏有机污染物的一种方法。这个项目是由华盛顿大学的恩格尔教授和他的学生在分析和表面化学项目的支持下完成的，研究了这种光催化氧化反应的详细机制。超高真空分子束散射方法，结合扫描探针显微镜对二氧化钛表面进行结构表征，提供了几种模型反应的详细机理和动力学信息。特别以丙酮、甲酸和丙醇为模式有机物质，研究了一系列光解条件和表面条件。光催化解毒有机污染地下水是一个重要的环境修复目标。本项目的工作旨在为二氧化钛等有前途的底物的光催化提供基本的认识。结构和动力学信息相结合，提供了光催化机理的完整画面。这一信息将有助于优化催化表面和环境修复过程的条件

Photocatalytic oxidation of organic molecules at the surface of titania shows promise as a method for the remediation of organic contaminated groundwater, and the destruction of organic contaminants. This project by Professor Engel and his students at the University of Washington, supported in the Analytical and Surface Chemistry Program, addresses the detailed mechanism of this photocatalytic oxidation reaction. Ultra high vacuum molecular beam scattering methods, coupled with scanning probe microscopy for structural characterization of the titania surface, provide detailed mechanistic and dynamic information about several model reactions. In particular, acetone, formic acid and propanol are used as model organic species, and a range of photolysis conditions and surface conditions are investigated. The photocatalytic detoxification of organic contaminated groundwater is an important environmental remediation goal. The work of this project is designed to provide the basic understanding of this photocatalysis on promising substrates such as titanium dioxide. Structural and kinetic information is combined to supply a complete picture of the photocatalytic mechanism. This information will be useful in optimizing both the catalytic surface and the conditions for environmental remediation processes.*