商品化全氟化合物-全氟磷酸直接和间接光解特性研究

全氟磷酸(PFPAs)是环境水体中新近发现的一类商品化全氟化合物(PFCs)，具有与PFOS和PFOA相似的结构特征，可能是一种潜在的持久性有机污染物，目前尚缺乏有效降解的方法。本项目以大量生产和使用的全氟辛磷酸(PFOPA)为研究对象，开展三种不同波长紫外光下，其在水溶液中的直接光解以及二氧化钛或氧化锌为光催化剂时的间接光解特性研究。通过对光解反应和影响因素的考察、降解产物的鉴别和分析、活性中间物种的识别及其变化规律的研究和反应前后催化剂表面特性的表征，阐明其直接和间接光解反应的特性和反应机制，以期为有效控制PFPAs的排放，减少PFCs引起的环境污染提供理论依据和技术支持，同时为进一步开发温和条件下高效控制PFPAs的治理方法和技术奠定基础。

Recently, perfluorinated phosphonic acids (PFPAs), one kind of commercial perfluorinated compounds (PFCs), were observed in aqueous environment. They may be potential persistent organic pollutants for their similar structure to that of PFOS or PFOA. However, no any effective decomposition methods of PFPAs are reported at present.　For this reason, under the irradiation of 185nm,254nm,and 365nm UV light, photolysis and photocatalysis with TiO2 or ZnO of perfluorooctyl phosphonic acid (PFOPA) which is used as a prevalent commercial surfactant and listed as a high-production-volume chemical will be studied in this project, respectively. The goal of the work is to discover the rule and mechanism of direct photolysis and photocatalysis of PFOPA by studying the reaction and impact factors in reaction, analyzing decomposition products and intermediates, and charactering the surface of photocatalyts before and after reaction. These will offer feasible methods or technologies for controlling environment pollution caused by PFPAs and basic data for further developing more effective decomposition methods/technologies of PFPAs under mild conditions.