Efficient and Selectable Production of Reactive Species Using a Nanosecond Pulsed Discharge in Gas Bubbles in Liquid

Abstract

A plasma gas bubble‐in‐liquid method for high production of selectable reactive species using a nanosecond pulse generator has been developed. The gas of choice is fed through a hollow needle in a point‐to‐plate bubble discharge, enabling improved selection of reactive species. The increased interface reactions, between the gas‐plasma and water through bubbles, give higher productivity. H2O2 was the predominant species produced using Ar plasma, while predominantly NnormalO3− and NO2 were generated using air plasma, in good agreement with the observed emission spectra. This method has nearly 100% selectivity for H2O2, with seven times higher production, and 92% selectivity for NnormalO3−, with nearly twice the production, compared with a plasma above the water.

Direct synthesis of hydrogen peroxide from plasma-water interactions

“…in strong acid to form H 2 TiO 4 (Ti 4+  + H 2 O 2  + 2H 2 O → H 2 TiO 4  + 4 H + ) and the absorption intensity of the yellow-coloured H 2 TiO 4 in 410 nm is proportional to the reacted H 2 O 2 concentration15484950. We can use it to determine the synthesized H 2 O 2 concentration.…”

Microwave Plasma Jet in Water: Characterization and Feasibility to Wastewater Treatment

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Argon gas plasma to decontaminate and extend shelf life of milk

“…To address these challenges we developed a method of gas bubble discharge (plasma) in liquid that enables efficient and selective production of the required reactive species . Using this approach, a high selective production of hydrogen peroxide (H 2 O 2 ) and nitrate (NO 3 ) were obtained by argon and air gas, respectively.…”