以POPs全氟辛磺酸和全氟辛酸为代表的“C8”类全氟化合物（C8-PFCs）固废的处置已成为我国必须解决的环保难题之一。本项目针对C8-PFCs分子中酸基和C-F键的弱化，设计并制备具有表面OH和Lewis酸中心的固体酸催化剂；针对高浓度固废，以固体酸为磨剂，以机械球磨持续更新催化剂表面的活性中心，实现C8-PFCs的可控脱酸基和脱氟并制备C7含氟烯烃，阐明其可控脱氟反应机制，建立一种基于机械化学催化使高浓度C8-PFCs固废再资源化的新方法；针对低浓度固废，采用固体酸和氧化剂为磨剂，以固体酸提供有利于C8-PFCs降解的微界面反应空间，以氧化剂提供反应活性物种，实现C8-PFCs的快速降解和完全脱氟，揭示固体酸与氧化剂协同作用机制，并提出一种机械化学氧化处置C8-PFCs固废的新方法。本项目提出的这一套C8-PFCs固废机械化学无害化及资源化处置方法，具有重要的理论意义和工程应用前景。

Perfluorooctane sulfonate and perfluorooctanoic acid are two typical C8-perfluorinated compounds (C8-PFCs) and have been added to the POPs list. It is urgent to develop treatment technologies for eliminating these pollutants from solid wastes. Mechanochemical (MC) method is a promising technology for the disposal of solid wastes containing halogenated pollutants, but few agents are effective to destruct C8-PFCs. In this research proposal, molecular design of active sites on catalysts and reactive species is developed to realize the controlled MC conversion or degradation of C8-PFCs. The surface hydroxylated solid acid catalysts (OH-SACs) provide two potentially distinct sites (OH and Lewis acid sites) for activating COOH and C-F bond. The high-energy impact under ball milling increases the Lewis acid sites, being favorable to the selective C-F cleavage. In the OH-SACs coupled MC system, the prevalence of decarboxylation and controlled defluorination would result in the formation of fluorinated C7-olefins. The fundamental understanding on the catalytic structure-reactivity relationships for preparing fluorinated C7-olefins would provide a control strategy for the resource utilization of solid wasters containing high C8-PFCs levels. In another MC system with OH-SACs and oxidant as additives, the interaction between OH-SACs and C8-PFCs enhances the vulnerability of C8-PFCs to the degradation, and the ball milling activates oxidants to produce strongly oxidizing species for attacking the above mentioned vulnerable sectors of C8-PFCs. The integration of OH-SACs, oxidizing agent and MC parameters would lead to a complete defluorination and deep mineralization of C8-PFCs. This process is suitable to harmlessly dispose solid wastes containing low levels of C8-PFCs . The new molecular level insights in the controlled partial or complete defluorination are very important to the disposal of C8-PFCs solid wastes in both environmental science and technology.