Journal article
Mechanism and Reactive Species in a Fountain-Strip DBD Plasma for Degrading Perfluorooctanoic Acid (PFOA)
Water (Basel), v 14(21), p3384
01 Nov 2022
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Perfluorooctanoic acid (PFOA) is an artificially synthesized perfluorinated chemical widely used in industries. It is often released into the environment without treatment, which causes pollution in groundwater. Recently, we have reported a rapid and efficient removal of PFOA in aqueous solution by using a fountain-strip dielectric barrier discharge reactor (SF-DBD). This design allows for the gaseous-liquid interaction to happen in a large space at atmospheric pressure, so it is a promising method to efficiently remove PFOA from water. Recently, we reported the effects of the process parameters, including power mode, pulse time, sinusoidal wave discharge, the discharge gas, initial concentration, pH, conductivity, and positive and negative discharges, on the efficiency of this method for PFOA degradation. Understanding the reaction mechanism is key to further improve the efficiency of the system. In this work, we reported the decomposition mechanism of the SF-DBD for PFOA degradation. The mass spectrum (MS) showed that PFOA was degraded to perfluoroheptanoic acid, perfluorohexanoic acid, perfluoropentanoic acid, perfluorobutanoic acid, perfluoropropionic acid, and trifluoroacetic acid after the plasma treatment. The optical emission spectroscope (OES) and the radical scavenger experiments indicated that the excited argon atoms and hydroxyl radicals played a major role in PFOA degradation, while the contributions from the solvated electrons (e(aq)(-)), superoxide anion radical (center dot O2-), and singlet oxygen (1O(2)) were negligible in initiating the cleavage reaction.
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Details
- Title
- Mechanism and Reactive Species in a Fountain-Strip DBD Plasma for Degrading Perfluorooctanoic Acid (PFOA)
- Creators
- Jiushan Cheng - Beijing Institute of Graphic CommunicationYangyang Fan - Beijing Institute of Graphic CommunicationXueyun Pei - Beijing Institute of Graphic CommunicationDi Tian - Beijing Institute of Graphic CommunicationZhongwei Liu - Beijing Institute of Graphic CommunicationZachary Z. Wei - Drexel UniversityHai-feng Ji - Drexel University, Materials Science and EngineeringQiang Chen - Beijing Institute of Graphic Communication
- Publication Details
- Water (Basel), v 14(21), p3384
- Publisher
- Mdpi
- Number of pages
- 9
- Grant note
- 11875090; 12075032; 11775028; 12105021 / National Natural Science Foundation of China; National Natural Science Foundation of China (NSFC)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering; Chemistry
- Web of Science ID
- WOS:000882212400001
- Scopus ID
- 2-s2.0-85141838864
- Other Identifier
- 991021860619204721
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- Collaboration types
- International collaboration
- Web of Science research areas
- Environmental Sciences
- Water Resources