Fluorescence Detection of Hydroxyl Radicals in Water Produced by Atmospheric Pulsed Discharges

被引：26

作者：

Li, S. ^{[1
]}

Timoshkin, I. V. ^{[1
]}

Maclean, M. ^{[1
,2
]}

MacGregor, S. J. ^{[1
]}

Wilson, M. P. ^{[1
]}

Given, M. J. ^{[1
]}

Wang, T. ^{[1
]}

Anderson, J. G. ^{[1
]}

机构：

[1] Univ Strathclyde, Dept Elect & Elect Engn, Glasgow G1 1XW, Lanark, Scotland

[2] Univ Strathclyde, Dept Biomed Engn, Glasgow G4 0NW, Lanark, Scotland

来源：

IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION | 2015年 / 22卷 / 04期

关键词：

Streamer discharges; OH radicals; Fluorescence; HIGH-VOLTAGE; CORONA DISCHARGES; PLASMA; DECOMPOSITION; INACTIVATION; OZONE; AIR;

D O I：

10.1109/TDEI.2015.005147

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

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.

引用

页码：1856 / 1865

页数：10

共 32 条

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