The investigation of RONS permeation in plasma-activated oil-water mixed system

Insight into the permeation of reactive oxygen and nitrogen species (RONS) in plasma-activated water is key to optimize and control the biochemical effects. Recently, most investigations on the permeation of RONS mainly concentrate in plasma-activated water where the solution is a single-phase system, while little attention is paid to mixed-phase systems. In this study, we select the oil-water mixed system as a research object and aim at evaluating the effectiveness of different volumes of oil on the generation and transport of RONS in a plasma-activated oil-water (PAOW) mixed system. Results show that the oil layer could significantly impede the permeation ratio of RONS causing a reduction of formation of aqueous RONS in PAOW. The mechanism may be due to the consumption of RONS reacting with the unsaturated bonds in the oil or being adsorbed for the high viscosity of the oil. This study provides valuable guidance for in-depth research on RONS permeation and optimization of wide applications in biomedicine and wastewater treatment.