Mainz 2022 – scientific programme
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P: Fachverband Plasmaphysik
P 9: Poster I
P 9.49: Poster
Tuesday, March 29, 2022, 16:00–17:30, P
Determination of hydrogen peroxide concentration in water treated by a capillary plasma jet — •Steffen Schüttler1, Emanuel Jeß1, Marc Böke2, Volker Schulz-von der Gathen2, and Judith Golda1 — 1Plasma Interface Physics, Ruhr-University Bochum, Germany — 2Experimental Physics II: Physics of Reactive Plasmas, Ruhr-University Bochum, Germany
A novel and promising approach to activate a biocatalyst is by use of an atmospheric pressure plasma jet that produces hydrogen peroxide [1]. Since the biocatalyst requires a well-defined portion of hydrogen peroxide, a plasma is ideally suited as it can be easily switched on and off. In the plasma-driven biocatalysis process, the biocatalyst is placed in a liquid, mainly water, and the plasma jet is in contact with the liquid via its effluent. In this work, a capillary plasma jet is used, which offers a wide range of control parameters and optimization possibilities. The hydrogen peroxide concentration in water was measured by UV absorption spectroscopy. This technique allows an in-situ measurement while the plasma is in operation and the spatial resolution of the hydrogen peroxide concentration can be obtained. Furthermore, a spectrophotometric approach was used. Ammonium metavanadate was added to the treated water. Its reaction with hydrogen peroxide leads to an absorption spectrum at 450 nm. This enables comparable measurements to the UV absorption measurements. This work is supported by the DPG within SFB1316 (Subproject B11).
[1] A. Yayci, T. Dirks, F. Kogelheide, M. Alcalde, F. Hollmann, P. Awakowicz, J. E. Bandow, ChemCatChem 2020, 12, 5893.