Efficiency and kinetic model of defluorination of perfluorooctanoic acid by persulfate oxidation
CHEN Xiao-qiang1, PAN Wei-bin1,2,3, SUN Jie-ying1
1. School of Environmental and Energy, South China University of Technology, Guangzhou 510006, China; 2. Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, China; 3. Engineering and Technology Research Centre of Guangzhou Water Resource and Water Environment, Guangzhou 510006, China
Abstract：Defluorination of perfluorooctanoic acid (PFOA) by persulfate (PS) oxidation was analyzed. The relationships between the defluorination rate and the initial pH (from 1 to 12), the initial concentration of PS (from 0 to 400.0mmol/L), the temperature (from 25.0 to 60.0℃) and the reaction time (from 0 to 24h) were investigated. The results showed that the initial pH, the initial concentration of PS and the temperature had significant effects on the defluorination rate, and the highest defluorination rate was up to 86.52%. Under the condition of initial pH range from 1.5 to 3, it was obvious that the defluorination of PFOA was enhanced, while the initial pH 1or 12 was not conducive to the defluorination of PFOA. The defluorination kinetic model, ln (1-φ)=-kobst, could well describe the relationship between the defluorination rate (φ) and the reaction time (t), the temperature and the initial concentration of PS.
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CHEN Xiao-qiang, PAN Wei-bin, SUN Jie-ying. Efficiency and kinetic model of defluorination of perfluorooctanoic acid by persulfate oxidation. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(7): 2995-3002.
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