全氟辛酸
化学
矿化(土壤科学)
硝酸盐
环境化学
水溶液
氧化还原
激进的
无机化学
分解
铁
动力学
氟化物
氮气
有机化学
物理
量子力学
作者
Yijin Yuan,Li Feng,Ning Xie,Lizhi Zhang,Jingming Gong
标识
DOI:10.1016/j.jhazmat.2019.121730
摘要
Developing efficient methods to degrade perfluorochemicals (PFCs), an emerging class of highly recalcitrant contaminants, are urgently needed in recent years, due to their persistence, high toxicity, and resistance to most regular treatment procedures. Here, a UV-photolysis system is reported for efficient mineralization of perfluorooctanoic acid (PFOA) via irradiation of ferric nitrate aqueous solution, where in-situ generating •NO2 and the effective Fe3+/Fe2+ redox cycle synergistically play great roles on rapidly mediating the mineralization of PFOA. A fast PFOA removal kinetics with first-order kinetic constants of 2.262 h−1 is observed at initial PFOA concentration of 5 ppm (50 mL volume), reaching ∼ 92 % removal efficiency within only 0.5-h irradiation. Near-stoichiometric fluoride ions liberation and high total organic carbon (TOC) removal efficiency (∼100 %) further validated the capability for completely destructive removal of PFOA. A tentative pathway for PFOA destruction is proposed. This work, by UV photolysis of abundant existing iron/nitrate-based systems in natural environment, provides an economical, sustainable and highly efficient approach for complete mineralization of perfluorinated chemicals.
科研通智能强力驱动
Strongly Powered by AbleSci AI