Fluorescence detection of hydroxyl radicals in water produced by atmospheric pulsed discharges

Li, S. and Timoshkin, I. V. and MacLean, M. and MacGregor, S. J. and Wilson, M. P. and Given, M. J. and Wang, T. and Anderson, J. G. (2015) Fluorescence detection of hydroxyl radicals in water produced by atmospheric pulsed discharges. IEEE Transactions on Dielectrics and Electrical Insulation, 22 (4). pp. 1856-1865. ISSN 1070-9878 (https://doi.org/10.1109/TDEI.2015.005147)

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Abstract

It has been proven that hydroxyl (OH) radicals can be generated by streamer discharges across water surfaces under ambient atmospheric conditions. Hydroxyl radicals have the highest oxidation capability amongst all oxygen-based reactive species, thus OH play an important role in oxidation of organic molecules and the bactericidal effects of plasma discharges. In this study, generation of hydroxyl radicals in water by pulsed streamer discharges was investigated. Terephthalic acid was used as a chemical probe as this acid is converted into 2-hydroxyterephthalic acid (HTA) by chemical reaction with OH radicals. The concentration of OH radicals was quantified by measuring the fluorescence light intensity generated by HTA molecules in water solutions. Both positive and negative pulsed discharges with different voltage levels were tested. Two different types of sample holder – non-conductive plastic dishes, and dishes lined with conductive aluminum foil – were used in order to investigate the effect of the discharge propagation path on the efficiency of OH production. The efficiency of OH production was measured as a function of: the distance between the needle electrode and the water surface; the magnitude and polarity of HV energization; and the total delivered charge. The obtained results will help in optimization of non-thermal plasma systems for chemical and biological decontamination.

ORCID iDs

Li, S. ORCID logoORCID: https://orcid.org/0000-0002-2267-4335, Timoshkin, I. V. ORCID logoORCID: https://orcid.org/0000-0002-0380-9003, MacLean, M. ORCID logoORCID: https://orcid.org/0000-0001-5750-0397, MacGregor, S. J. ORCID logoORCID: https://orcid.org/0000-0002-0808-585X, Wilson, M. P. ORCID logoORCID: https://orcid.org/0000-0003-3088-8541, Given, M. J. ORCID logoORCID: https://orcid.org/0000-0002-6354-2486, Wang, T. ORCID logoORCID: https://orcid.org/0000-0003-3054-0772 and Anderson, J. G. ORCID logoORCID: https://orcid.org/0000-0003-4151-1619;
  • Item type:Article
    ID code:53799
    Dates:
    Date
    Event
    31 August 2015
    Published
    11 August 2015
    Published Online
    19 May 2015
    Accepted
    Notes:(c) 2015 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.
    Subjects:Technology > Electrical engineering. Electronics Nuclear engineering
    Department:Faculty of Engineering > Electronic and Electrical Engineering
    Depositing user: Pure Administrator
    Date deposited:21 Jul 2015 13:40
    Last modified:11 Nov 2024 10:57
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/53799
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