3D石墨烯-PbO2复合阳极高效电催化降解PFOS机制研究及其毒性风险评价

全氟辛烷磺酸类化合物(PFOS)是一类持久性极强、最难分解的有毒有机污染物，尚缺乏经济、有效的处理手段。申请人尝试利用电沉积技术制备了三维(3D)石墨烯-PbO2复合阳极，能够实现高效电催化降解PFOS，但目前该电极高效降解PFOS的机制尚未阐明。本项目拟对该电极的形貌、微观结构和电化学性能进行表征分析，结合3D石墨烯对PbO2结晶方式和生长过程的影响规律，揭示3D石墨烯对PbO2电极电催化性能的作用机制；探究PFOS在3D石墨烯-PbO2阳极表面的氧化特性，建立降解反应动力学模型、电流效率和能耗计算模型；并深入剖析PFOS降解形成的中间产物，阐明PFOS的降解机理，评估该降解过程的毒性风险。本项目的研究成果不仅为电催化降解PFOS提供理论和技术支持，还为持久性有毒污染物的水污染防治及其毒性风险评估提供重要科学依据。

Perfourooctane sulfonate (PFOS) and its derivatives, as a kind of toxic, extremely persistant and most refractory organic pollutants, lack economic and effective treatment methods. Based on the previous research findings, the highly effective degradation of PFOS was observed in electrochemical oxidation process with an electroplated three-dimensional (3D) graphene-PbO2 composite anode. However, the degradation mechanisms of PFOS on the 3D graphene-PbO2 composite anode have not been clarified. Thus, in this project, in order to detect the effect mechanism of 3D graphene on PbO2 electrodes, the surface morphology, microstructure, electrochemical performance of 3D graphene-PbO2 composite anodes will be characterized, and the nucleation and growth process of PbO2 crystals will be studied. And also the reaction kinetics models and the calculation models of current efficiency and energy consumption will be proposed basing on the electrochemical oxidation performance of PFOS on 3D graphene-PbO2 composite anode. Furthermore, the intermediates of PFOS degradation will be analyzed to propose its degradation mechanism and evaluate the toxic risk of this degradation process. Results of this project not only provide theoretical and technical support for the electrochemical oxidation of PFOS, but also provide scientific basis for water pollution control of persistent toxic pollutants and its toxic risk assessment.