Preparative application of liquid-plasma interaction

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The goal of the present research is the creation of a novel reaction medium involving liquid-phase plasma in order to develop the preparative method of organic or inorganic substances. Hitherto, it has been taken for granted that the reactions under such an extremely energetic condition should be destined to be unselective. In the present research, it was undertaken to utilize the interaction between gaseous plasma and liquid solution and reactive species inductively generated in the solution to improve the selectivity.Organic substances dissolved in aqueous solution were effectively decomposed to carbon dioxide when a plasma was sustained over the solution surface by means of glow discharge electrolysis. It was suggested that hydroxyl radical would play a crucial role in the mineralization. When perhalocarbons were used as liquid media in contact with gaseous plasmas, the formation of carbonaceous precipitate or deposit on the discharge electrode was observed.1. Mechanistic study of liquid-phase oxidation induced by gaseous plasma(1) Oxidative degradation of phenols by using an atmospheric pressure dc plasma(2) Iodometric determination of the generation rate of highly reactive oxidant(3) Mineralization pathway involving hydroxyl radical(4) Organic oxidation using high voltage ac plasma(5) Measurement of emission spectra from liquid-plasma interface2. Preparation of carbonaceous substances utilizing liquid-phase plasma reactions(1) Formation of C1〜C6 halocarbons from polychloromethanes or polychloroethylenes(2) Characterization of carbonaceous precipitate or deposit on the discharge electrode(3) Dechlorocarbene as intermediate super-reactive species