The fate of plasma-generated oxygen atoms in aqueous solutions: non-equilibrium atmospheric pressure plasmas as an efficient source of atomic O_(aq)

Abstract

Non-equilibrium radio-frequency driven atmospheric-pressure plasma in He/0.6%O gas mixture has been used to study the reaction mechanism of plasma-generated oxygen atoms in aqueous solutions. The effluent from the plasma source operated with standard and O-labeled O gas was used to treat water in the presence of phenol as a chemical probe. Comparing the mass spectrometry and gas chromatography-mass spectrometry data of the solutions treated with plasma under normal and labeled oxygen provides clear evidence that O originating from the gas phase enters the liquid and reacts directly with phenol, without any intermediate reactions. Additionally, the atmospheric-pressure plasma source demonstrates great potential to be an effective source of O atoms without the requirement for any precursors in the liquid phase.

Hydroxylation and self-assembly of colloidal hydrogenated nanodiamonds by aqueous oxygen radicals from atmospheric pressure plasma jet

“…This site will be saturated by single-bonding OH, resulting either from the 1 st step, reaction of aqueous O atoms with H 2 O, or delivered from the jet. The efficient hydroxylation of phenol in the same reactor system was reported 27,44 with the evidence that the majority of O atoms forming the -OH groups originates from the plasma jet itself and not from water. Nevertheless, the effect of either O or OH produced from the jet and interacting with hydrocarbon residues on the NDs surface seems to be very similar.…”

Applications of the COST Plasma Jet: More than a Reference Standard

“…One of the unique properties of the COST jet is its ability to produce ROS in the gas phase with high selectivity, as we discussed above. Additionally, and perhaps more importantly, it was also shown by studying the oxidative transformations of phenolic compounds in water that the COST jet is a very effective instrument to induce O atoms in liquid solutions [36,37]. In general, CAPs are unique systems for the delivery of short-lived species (atoms and radicals) [38], very sought-after in chemical applications, as we demonstrate below.…”

Corrigendum: Characterization of the effluent of a He/O2 micro-scaled atmospheric pressure plasma jet by quantitative molecular beam mass spectrometry (2010 New J. Phys. 12 013021)

“…The rescaled MBMS densities, the TALIF densities or an average value of both should be used as representative for the analyzed jet. The higher O densities should be taken into account in our other publications, where the absolute O density has been used to analyze and interpret the experimental data[7][8][9][10].…”