Atmospheric plasma generates oxygen atoms as oxidizing species in aqueous solutions

0466374 - ÚFP 2017 RIV GB eng J - Journal Article
Hefny, M.M. - Pattyn, C. - Lukeš, Petr - Benedikt, J.
Atmospheric plasma generates oxygen atoms as oxidizing species in aqueous solutions.
Journal of Physics D-Applied Physics. Roč. 49, č. 40 (2016), s. 404002. ISSN 0022-3727. E-ISSN 1361-6463
R&D Projects: GA MŠMT(CZ) LD14080
Grant - others:European Cooperation in Science and Technology(XE) COST TD1208
Institutional support: RVO:61389021
Keywords : atmospheric pressure plasma * transport of reactive species * reactive oxygen species * aqueous phase chemistry * plasma and liquids * phenol aqueous chemistry
Subject RIV: BL - Plasma and Gas Discharge Physics
Impact factor: 2.588, year: 2016
http://iopscience.iop.org/article/10.1088/0022-3727/49/40/404002

A remote microscale atmospheric pressure plasma jet (µAPPJ) with He, He/H2O, He/O2, and He/O2/H2O gas mixtures was used to study the transport of reactive species from the gas phase into the liquid and the following aqueous phase chemistry. The effects induced by the µAPPJ in water were quantitatively studied using phenol as a chemical probe and by measuring H2O2 concentration and pH values. These results were combined with the analysis of the absolute densities of the reactive species and the modeling of convective/diffusion transport and recombination reactions in the effluent of the plasma jet. Additionally, modified plasma jets were used to show that the role of emitted photons in aqueous chemistry is negligible for these plasma sources. The fastest phenol degradation was measured for the He/O2 plasma, followed by He/H2O, He/O2/H2O, and He plasmas. The modeled quantitative flux of O atoms into the liquid in the He/O2 plasma case was highly comparable with the phenol degradation rate and showed a very high transfer efficiency of reactive species from the plasma into the liquid, where more than half of the O atoms leaving the jet nozzle entered the liquid.
Permanent Link: http://hdl.handle.net/11104/0264700