BiFeO3/TiO2纳米管异质结光降解典型PFCs分子的特性与机理研究

项目名称： BiFeO3/TiO2纳米管异质结光降解典型PFCs分子的特性与机理研究

项目编号： No.21207015

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 环境化学

项目作者： 肇启东

作者单位： 大连理工大学

项目金额： 24万元

中文摘要： 全氟取代有机化合物（PFCs）属于一类广泛存在于环境中的人造持久性有机污染物（POPS），因其分子结构中的C?F键使其非常稳定,在环境中缺乏天然降解途径而造成持久性的危害，受到世界各国的普遍关注。针对传统光化学技术对PFCs降解效率低的问题，本项目提出构建纳米尺度的BiFeO3/TiO2纳米管异质结材料，利用铁电化合物微观固有的电场实现光生电荷的高效分离，从提高微区光电压强度与能量转换效率的角度强化PFCS的光化学降解。研究内容具体包括：研制BiFeO3/TiO2纳米管异质结材料；研究异质结材料在紫外光诱导下降解典型PFCs分子的特性，深入讨论铁电纳米异质结结构增强光生电荷的分离与促进底物降解的规律，揭示PFCs在这类纳米结构材料表面的光化学转化途径与机理。本项目的实施可为结合光化学技术与铁电材料处理难降解POPs有机物提供科学基础与依据。

中文关键词： 纳米管；异质结构；光催化降解；全氟化合物；表面光电压

英文摘要： Perfluorinated compounds (PFCs) are a family of anthropogenic fluorine-containing chemicals turning up in various places around the world, which are incredibly resistant to breakdown due to the strong C-F bonding. PFCs exist in the environment as persistent organic pollutants (POPs), causing persistent harm to life. There is a lack of natural process to degrade PFCs, which has attracted great attention from all the coutries. This project therefore aims at developing advanced photocatalysts based on BiFeO3/TiO2 nanotube heterojunctions to adrress the issue of the low efficiency of photochemical PFCs degradation. The creative idea is utilizing the intrinsic electric field possessed by the ferroelectric structure to promote the separation of the photo-induced charges. Then the local photovoltage intensity on nano-meter scale and energy conversion efficiency will be enhanced to enforce the photochemical degaradation of PFCs. The content include the following items. First, a series of novel materials with nano heterojunctions based on BiFeO3/TiO2 nanotubes will be designed and fabricated. Second, the degradation properties of the typical PFCs over these materials under UV irradiation will be investigated in detail. Third, the applicants will analyze the regularity of photo-induced charges separation and promoted degr

英文关键词： Nanotube；Heterostructure；Photocatalytic Degradation；Perfluorinated Compounds；Surface Photovoltage