Hydroxyl radical production in DC streamer discharge

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Zhao, Yi Yi and Wilson, Mark P. and Wang, Tao and Timoshkin, Igor V. and MacGregor, Scott J.; (2015) Hydroxyl radical production in DC streamer discharge. In: Proceedings of IEEE International Pulsed Power Conference 2015. IEEE, USA, pp. 1-4. ISBN 9781479984039 (https://doi.org/10.1109/PPC.2015.7296962)

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Abstract

Plasma-induced advanced oxidation processes do not suffer from the drawbacks, such as carcinogenic by-products, associated with conventional water treatment, and enable the removal of micro-pollutants. The high oxidation strength of hydroxyl radicals enables degradation of resistant contaminants. Many reactions are known to occur at the plasma-water interface; however, the mechanisms of hydroxyl radical production are still not clear. To understand the physical and chemical processes occurring at the plasma-water interface, this research involved investigation of the hydroxyl radicals produced during d.c. streamer discharges. A needle-plate electrode configuration in atmospheric air was used, with the treated solution used as the ground electrode. To understand the effects of polarity and gas type on hydroxyl radical production, both positive- and negative-polarity energization in air, nitrogen and helium were investigated. Plasma filaments were developed from the needle electrode, which was in contact with the solution. Terephthalic acid (TA) was used as a scavenger of hydroxyl (OH) radicals, with OH density subsequently being quantified by fluorescence emission from 2-hydroxyterephthalic acid (HTA), which is formed through specific reaction between TA and OH. The power inputs in positive pulsed streamer discharges were 0.125 W, 0.18 W and 0.26 W in air, nitrogen and helium, respectively; the corresponding hydroxyl radical production efficiencies were 0.56 mmol/kWh, 1.1 mmol/kWh and 5.94 mmol/kWh, respectively. For negative pulsed streamer discharges in air, the power input was 0.063 W and the efficiency was 1 mmol/kWh. The hydroxyl radical production rates were 2.6× 10-7 Ms-1 in negative air discharges, and 2.7× 10-7 Ms-1, 1.8× 10-6 Ms-1, and 2.2× 10-6 Ms-1 in positive air, nitrogen and helium discharges, respectively.

ORCID iDs

Zhao, Yi Yi ORCID logoORCID: https://orcid.org/0000-0002-7728-553X, Wilson, Mark P. ORCID logoORCID: https://orcid.org/0000-0003-3088-8541, Wang, Tao ORCID logoORCID: https://orcid.org/0000-0003-3054-0772, Timoshkin, Igor V. ORCID logoORCID: https://orcid.org/0000-0002-0380-9003 and MacGregor, Scott J. ORCID logoORCID: https://orcid.org/0000-0002-0808-585X;
  • Item type:Book Section
    ID code:57706
    Dates:
    Date
    Event
    12 October 2015
    Published
    Notes:© 2015 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, 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 component 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:06 Sep 2016 14:06
    Last modified:11 Nov 2024 15:03
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/57706
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