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气液两相脉冲放电等离子体去除水中的全氟辛酸

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胡雨晴, 宋文哲, 马春萌, 于建伟, 尚巍, 杨敏, 张昱. 气液两相脉冲放电等离子体去除水中的全氟辛酸[J]. 环境化学, 2019, (10): 2171-2179. doi: 10.7524/j.issn.0254-6108.2018112905
引用本文: 胡雨晴, 宋文哲, 马春萌, 于建伟, 尚巍, 杨敏, 张昱. 气液两相脉冲放电等离子体去除水中的全氟辛酸[J]. 环境化学, 2019, (10): 2171-2179. doi: 10.7524/j.issn.0254-6108.2018112905
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HU Yuqing, SONG Wenzhe, MA Chunmeng, YU Jianwei, SHANG Wei, YANG Min, ZHANG Yu. Degradation of perfluorooctanoic in water using gas-liquid pulsed discharge plasma[J]. Environmental Chemistry, 2019, (10): 2171-2179. doi: 10.7524/j.issn.0254-6108.2018112905
Citation: HU Yuqing, SONG Wenzhe, MA Chunmeng, YU Jianwei, SHANG Wei, YANG Min, ZHANG Yu. Degradation of perfluorooctanoic in water using gas-liquid pulsed discharge plasma[J]. Environmental Chemistry, 2019, (10): 2171-2179. doi: 10.7524/j.issn.0254-6108.2018112905
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气液两相脉冲放电等离子体去除水中的全氟辛酸

  • 1. 中国科学院生态环境研究中心, 环境水质学国家重点实验室, 北京, 100085;

  • 2. 中国科学院大学, 北京, 100049;

  • 3. 中国市政工程华北设计研究总院有限公司, 天津, 300074

    • 通讯作者: 张昱, E-mail: zhangyu@rcees.ac.cn
  • 基金项目:

    水体污染控制与治理科技重大专项（2017ZX07106005）资助.

Degradation of perfluorooctanoic in water using gas-liquid pulsed discharge plasma

  • 1. State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China;

  • 2. University of Chinese Academy of Sciences, Beijing, 100049, China;

  • 3. North China Municipal Engineering Design&Research Institute, Tianjin, 300074, China

    • Corresponding author: ZHANG Yu, zhangyu@rcees.ac.cn
  • Fund Project: Supported by Major Science and Technology Program for Water Pollution Control and Treatment(2017ZX07106005).

  • 摘要: 水中的全氟化合物具有很强的稳定性，常规方法难以去除.本文以全氟辛酸（PFOA）为目标，考察了一种基于液滴喷雾的气液两相脉冲放电等离子体反应器对PFOA去除的影响因素与去除效率，并探讨了去除机理.发现PFOA起始浓度为1.5 μg·L-1，等离子体反应器脉冲频率为1000 pps，电压为25 kV时PFOA的2 h去除率达40.5%.通过比较不同仪器参数下的去除效率发现，在相对低脉冲频率、低电压条件下PFOA去除效率更高，其表征去除效率的k/PD值达0.259 L·min-1·W-1（k为去除速率常数，PD=输入功率/处理体积），高于同样浓度水平下已报道的层流发泡等离子体反应器最大k/PD值（0.025 L·min-1·W-1），表明液滴喷雾反应器具有低能耗的特点.在等离子体处理过程中检测到多种短链全氟羧酸（碳原子数为4—7）和氟离子的生成，2 h后产生的短链物质总和占初始PFOA的10%左右，表明PFOA的碳链在等离子体处理时发生断裂.加入电子抑制剂NaNO3后PFOA的去除明显被抑制，表明自由电子在初级反应过程中起较大作用.本研究对于水中PFOA的有效去除提供了一种有应用前景的技术选择.
    Abstract: Perfluorinated compounds in water have strong stability and are difficult to be removed by conventional methods. In this study, perfluorooctanoic acid (PFOA) was used as the target, to investigate the influence factors and the removal efficiency of PFOA using gas-liquid pulsed discharge plasma reactor based on droplet spray, and the removal mechanism was also discussed. It was found that when the initial concentration of PFOA was 1.5 μg·L-1, the plasma pulse frequency was 1000 pps, and the voltage was 25 kV, the removal rate of PFOA reached 40.5% after 2 hours. By comparing the removal efficiency under different instrumental parameters, it was found that PFOA removal efficiency was higher under low pulse frequency and low voltage conditions. The k/PD value of the removal efficiency was 0.259 L·min-1·W-1, which was higher than the maximum k/PD value of the laminar jet with bubbling reactor reported at the same concentration level (0.025 L·min-1·W-1), showing that the energy consumption of the droplet spray reactor was low. A variety of short-chain perfluorocarboxylic acids and F- were detected in the process of plasma treatment. The total production of short-chain perfluorocarboxylic acids produced after 2 hours accounted for about 10% of the initial PFOA. The removal of PFOA was significantly inhibited after the addition of the electronic inhibitor NaNO3, indicating that free electrons play a major role in the initial reaction process. It provides a promising technical method for the effective removal of PFOA in water.
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  • 收稿日期:  2018-11-29

气液两相脉冲放电等离子体去除水中的全氟辛酸

    通讯作者: 张昱, E-mail: zhangyu@rcees.ac.cn
  • 1. 中国科学院生态环境研究中心, 环境水质学国家重点实验室, 北京, 100085;
  • 2. 中国科学院大学, 北京, 100049;
  • 3. 中国市政工程华北设计研究总院有限公司, 天津, 300074
  • 收稿日期:  2018-11-29
基金项目:

水体污染控制与治理科技重大专项（2017ZX07106005）资助.

摘要: 水中的全氟化合物具有很强的稳定性，常规方法难以去除.本文以全氟辛酸（PFOA）为目标，考察了一种基于液滴喷雾的气液两相脉冲放电等离子体反应器对PFOA去除的影响因素与去除效率，并探讨了去除机理.发现PFOA起始浓度为1.5 μg·L-1，等离子体反应器脉冲频率为1000 pps，电压为25 kV时PFOA的2 h去除率达40.5%.通过比较不同仪器参数下的去除效率发现，在相对低脉冲频率、低电压条件下PFOA去除效率更高，其表征去除效率的k/PD值达0.259 L·min-1·W-1（k为去除速率常数，PD=输入功率/处理体积），高于同样浓度水平下已报道的层流发泡等离子体反应器最大k/PD值（0.025 L·min-1·W-1），表明液滴喷雾反应器具有低能耗的特点.在等离子体处理过程中检测到多种短链全氟羧酸（碳原子数为4—7）和氟离子的生成，2 h后产生的短链物质总和占初始PFOA的10%左右，表明PFOA的碳链在等离子体处理时发生断裂.加入电子抑制剂NaNO3后PFOA的去除明显被抑制，表明自由电子在初级反应过程中起较大作用.本研究对于水中PFOA的有效去除提供了一种有应用前景的技术选择.

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