Electric Discharges in Water Solutions

journal article - other

English

This thesis represents a broad overview dealing with electric discharges in liquids in general, and presents the main results obtained within the investigation of the pin-hole configuration. Fundamental conclusions were published by the applicant in 17 papers from 2002 to 2012 whereas nine of them are a part of the thesis. The theoretical part of the thesis is focused on problems of electric discharge generation in liquids and its relation to water treatment as one of the most utilised applications. In the experimental part, particular plasma and other devices are described in details because their development was crucial for the studied phenomena. The first part of the research itself is devoted to the discharge breakdown in various water solutions. Formation of non-thermal plasma was studied with respect to different experimental conditions in order to estimate optimal discharge operation for the potential applications. Besides determination of the breakdown parameters, related processes such as propagation of plasma channels and bubble formation were observed as well. Plasma diagnostics was realised by electric measurements, optical emission spectroscopy and ICCD imaging. The next part deals with chemical processes initiated by the discharge in water solutions and their utilisation in selected applications. Formation of reactive species was studied by optical emission spectroscopy and colorimetric methods. Plasma applications were devoted to decomposition of selected organic compounds, plasma sterilisations and spectroscopic detection of metallic traces in the solution. Analyses of treated solutions were realised by absorption and fluorescence spectroscopy, HPLC-MS methods, ICP methods, optical emission spectroscopy and the standard CFU method in case of plasma sterilisations. The work proved the successful degradation of organic dyes depending on the proper set of experimental conditions as well as the exact determination of metallic traces in the solution by OES. On the other hand, plasma sterilisations and removal of humic matters from water were assumed as non-perspective in the studied discharge configurations.

Discharges in liquids; non-thermal plasma; plasma diagnostics; electric measurements; optical emission spectroscopy; absorption spectroscopy; reactive species; water treatment; decomposition of organic compounds; organic dyes; humic acids; plasma sterilisations; electrolysis

KOZÁKOVÁ, Z.

31. 10. 2013

Vutium

Brno

1213-418X

Vědecké spisy Vysokého učení technického v Brně Edice Habilitační a inaugurační spisy

454

1

Czech Republic

1

32

32

https://www.vutbr.cz/vutium/spisy?action=ukazka&id=1523&publikace_id=14502