纳秒脉冲介质阻挡放电等离子体去除水中全氟辛酸研究

Removal of Perfluorooctanoic Acid from Water by Nanosecond Pulsed Dielectric Blocking Discharge Plasma

杨兰 刘瑞娟 沈舒苏 苗时雨 安晓强 兰华春

Lan YANG Ruijuan LIU Shusu SHEN Shiyu MIAO Xiaoqiang AN Huachun LAN

苏州科技大学 环境科学与工程学院, 江苏 苏州 215009 清华大学 环境学院水质与水生态研究中心, 北京 100084 桂林理工大学 环境科学与工程学院, 广西 桂林 541004

School of Environmental Science and Engineering，Suzhou University of Science and Technology，Suzhou Jiangsu 215009，China Center for Water and Ecology，School of Environment，Tsinghua University，Beijing 100084，China School of Environmental Science and Engineering，Guilin University of Technology，Guilin Guangxi 541004，China

由于全氟化合物中有很稳定的碳氟键，因此如何高效地去除受污染水体中全氟辛酸（PFOA）是一项挑战。采用纳秒脉冲介质阻挡放电等离子体（DBD）对水中难降解有机污染物PFOA进行降解处理，考察了放电气氛、放电功率等放电参数以及气体流量和液体流量等反应条件对PFOA去除率的影响。结果表明，在放电气氛为Ar、放电功率为11.84 W、气体流量为3.33 L/min、液体流量为0.28 L/min的条件下，DBD对PFOA具有较好的降解效果，反应60 min后PFOA去除率可达94.0%以上。结合发射光谱和自由基猝灭分析，确定破坏PFOA的分子结构、实现反应物高效降解的主要活性物种是e-、?OH、H2O2、O3。该技术可为PFOA去除提供有效的解决方法。

The efficient removal of perfluorooctanoic acid (PFOA) from contaminated water remains a challenge due to the very stable carbon?fluorine bonds in perfluorinated compounds.In this experiment,nanosecond pulsed dielectric barrier discharge (DBD) plasma was used to degrade PFOA,a difficult?to?degrade organic pollutant in water,and the effects of discharge parameters such as discharge atmosphere,discharge power,gas flow rate,and liquid flow rate,as well as the reaction conditions,on the removal rate of PFOA were investigated in the reaction.The experimental results showed that under the conditions of the discharge atmosphere of argon,discharge power of 11.84 W,gas flow rate of 3.33 L/min,and liquid flow rate of 0.28 L/min,DBD had a better degradation effect on PFOA,and the removal rate could reach more than 94.0% after 60 min of reaction.Combined with emission spectroscopy and free radical burst analysis,it was determined that e-,?OH,H2O2, and O3 were the main active species to break the molecular structure of PFOA and realize the efficient degradation of the reactants,and thus could provide an effective solution for the removal of PFOA in water.

国家重点研发计划项目(2019YFA0705801)

10.12422/j.issn.1006-396X.2024.01.001