2020•Asian Journal of ChemistryOpen access

Estimation of Hydroxyl Free Radicals Produced by Atmospheric Air Cold Plasma with Salicylic Acid Trapping

Van Hoang Nguyen, Nguyen Cao Tuan

Abstract

Salicylic acid is used as a scavenger to quantify free hydroxyl radicals (•OH) produced from a cold plasma process. High-performance liquid chromatography revealed that salicylic acid was decomposed to 2,3-dihydroxybenzoic acid (2,3-DHB) and 2,5-dihydroxybenzoic acid (2,5-DHB). The concentrations of 2,3-DHB and 2,5-DHB were the highest when the concentration of salicylic acid was > 8,000 mg/L. Quantifying 2,3-DHB and 2,5-DHB concentrations revealed the association between the •OH concentration and the reaction time by using the following first-order equation: [•OH] = 0.01713t + 0.0311. Additionally, the rate of •OH formation in relation to different cold plasma conditions was also determined.

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Key concepts: Chemistry, Salicylic acid, Radical, Hydroxyl radical, Scavenger, Plasma, Chromatography, Organic chemistry