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The research will focus on the fundamentals of non-equilibrium plasmas and their interaction with the surrounding media such as solids or liquids using spectroscopic techniques.

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Production and transport of plasma-generated hydrogen peroxide from gas to liquid

Plasma Science Fundamentals
Plasma Chemical Processes

In this work, the transport of hydroxyl radicals and hydrogen peroxide from a humid atmospheric pressure plasma jet into plasma-treated liquids is analysed. The concentration of H2O2 was measured by a spectrophotometric approach using the reagent ammonium metavanadate. OH was measured by the terephthalic acid dosimeter and the chemiluminescence of luminol. The plasma jet used is based on the design of the well-investigated COST reference jet and is extended by a capillary between the two electrodes. In addition to the experiments, the 0-dimensional plasma-chemical kinetics code GlobalKin was used to analyse the plasma chemistry in the gas phase in more detail. After 5 min plasma treatment, a maximum H2O2 concentration of 1 mM was found in the liquid, while the OH concentration was a factor 50 lower. The concentrations of both species in the liquid increased with plasma power, and the H2O2 concentration also increased with the humidity concentration of the feed gas, while the OH concentration first increased with humidity admixture and then decreased. The transport of both species could be controlled by the treatment distance, the gas flow rate and low frequency pulsing of the RF jet in such a way that the selectivity towards the long-lived species H2O2 was increased. Qualitative trends in the simulated number densities of gas phase H2O2 and OH at the location of the gas–liquid interface fit relatively well to the experimental measurements in the liquid.

plasma-treated liquid
atmospheric pressure plasma jet
hydrogen peroxide
hydroxyl radical
0D global plasma-chemical kinetics model
FieldValue
Publisher
PIP
Authors
Steffen Schüttler
Anna Lena Schöne
Emanuel Jeß
Andrew R. Gibson
Judith Golda
Release Date
2024-03-08
Identifier
630ce05a-283c-4f5d-bad5-cdcc04d1ff35
Permanent Identifier (URI)
https://rdpcidat.rub.de/node/807
Is supplementing
Phys. Chem. Chem. Phys., 2024,26, 8255-8272
Plasma Source Name
Capillary Plasma Jet
Plasma Source Application
plasma biocatalysis
Plasma Source Specification
RF
atmospheric pressure
Plasma Source Properties
Two stainless steel electrodes with capillary (borosilicate, wall thickness 0.2mm) in between. Dimension of plasma: width: 1mm, length: 40mm, height: 1mm, Volume: 40mm³. Distance between electrodes: 1.4mm. Distance between electrode (plasma) end to capillary exit: 10mm. Sinusoidal waveform at 13.56 MHz with voltages (rms) between 150 and 700V. Plasma powers of up to 10W. Gas composition varies.
License
Creative Commons Attribution 4.0 International
Plasma Medium Name
He
H2O
Plasma Medium Properties
Flow rate: 0,5 to 2 slm, humidity admixtures: 0 - 6400ppm (0-100% of gas flow through ice cooled bubbler)
Plasma Medium Procedure
Cooling of the bubbler 1h before measurements with 900mL ice cubes and 400mL fridge cooled water.
Plasma Target Name
Phosphate buffer
Contact Name
Steffen Schüttler
Plasma Target Properties
100mM phosphate buffer
Plasma Target Procedure
3 mL liquid volume in UV cuvette, adjustment of capillary to a distance of 14mm from liquid surface
Contact Email
steffen.schuettler@rub.de
Plasma Diagnostic Properties
Spectrophotometry using ammonium metavanadate, fluorometry using terephthalic acid, chemiluminescence using luminol, zero-dimensional plasma-chemical kinetics code GlobalKin
Public Access Level
Public
Plasma Diagnostic Name
Spectrophotometry
Fluorometry
Chemiluminescence
Funding Agency
German Science Foundation (DFG)
Project
SFB 1316
Subproject
B11

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