过硫酸盐对全氟辛酸的脱氟效果及其动力学模型

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摘要以过硫酸盐（PS）对全氟辛酸（PFOA）进行脱氟，考察脱氟率与初始pH值（1~12）、PS初始浓度（0~400.0mmol/L）、温度（25.0~60.0℃）和反应时间（0~24h）的关系，结果表明：初始pH值、PS初始浓度和温度对脱氟率有明显的影响，脱氟率最高可达86.52%；初始pH值为1.5~3的条件明显有利于PFOA的脱氟，而初始pH值为1或12的条件不利于PFOA的脱氟；脱氟动力学模型ln（1-φ）=-k_obst可以很好地描述脱氟率φ与反应时间t、温度和PS初始浓度的关系.

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关键词 ：全氟辛酸, 过硫酸盐, 脱氟, 动力学, 模型

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)=-k_obst, could well describe the relationship between the defluorination rate (φ) and the reaction time (t), the temperature and the initial concentration of PS.

Key words： perfluorooctanoic acid persulfate defluorination kinetics model

收稿日期: 2019-12-14

PACS:

X131

基金资助:广州市东山湖水质提升项目技术咨询（D5170670）

通讯作者: 潘伟斌,副教授,ppwbpan@scut.edu.cn E-mail: ppwbpan@scut.edu.cn

作者简介: 陈晓强(1994-),男,广东陆丰人,华南理工大学硕士研究生,研究方向为生态工程与环境修复.

引用本文:

陈晓强, 潘伟斌, 孙捷颖. 过硫酸盐对全氟辛酸的脱氟效果及其动力学模型[J]. 中国环境科学, 2020, 40(7): 2995-3002. 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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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2020/V40/I7/2995

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