Hannover 2020 – scientific programme

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P: Fachverband Plasmaphysik

P 12: Atmospheric-pressure plasma and applications 3

P 12.5: Talk

Wednesday, March 11, 2020, 12:15–12:30, b305

Loss processes of plasma-generated atomic oxygen in phenol solutions — •Kerstin Sgonina¹, Giuliana Bruno², Kristian Wende², and Jan Benedikt¹ — ¹Institute of Experimental and Applied Physics, Kiel University, Kiel, Germany — ²Leibniz Institute for Plasma Science and Technology, Greifswald, Germany

Aqueous solutions treated by cold atmospheric pressure plasma jets contain high amounts of reactive species. It has already been shown that atomic oxygen produced by a cold atmospheric pressure plasma jet effectively reacts with organic molecules like phenol dissolved in water without any intermediate reaction steps [1]. However, it is unknown whether the reactions with atomic oxygen are liquid-surface or liquid-volume dominated.

To investigate the loss processes of atomic oxygen in liquid solutions, experimental results are combined with simulations of the reaction kinetics. Phenol solutions were treated with the effluent of a He/O₂-plasma ignited in the COST-Jet which provides well-known densities of reactive oxygen species [2]. Variation of the phenol concentration allows an insight into the competing O-loss reactions in gas phase, liquid phase or at the liquid surface. The comparison to simulations of the reaction kinetics and transport from gas into liquid should reveal the up-to-now unknown absolute reaction rates of atomic oxygen in liquid phase and at the liquid surface.

[1] J. Benedikt et al., Phys. Chem. Chem. Phys. 20 12037, 2018.

[2] G. Willems et al., New J. Phys. 21 059501, 2019.