Plasma treated water

Illustration of the triple-mechanism scheme, featuring PFOA (highly surfactant-like), fluoxetine (moderately surfactant-like) and caffeine (not surfactant-like). Hydroxyl radicals (HO∙) were assumed to be the primary reactive species involved in surface and sub-surface reactions; argon ions (Ar+) and free electrons (e-) were assumed to be the reactive species involved in above-surface reactions. Image taken from Selma Mededovic Thagard et al 2017 J. Phys. D: Appl. Phys. 50 014003, © IOP Publishing, All Rights Reserved.

Which chemicals are best degraded by electrical plasmas?

By Dean Williams on December 14, 2016

Treatability of different chemical contaminants can be estimated simply by evaluating the extent to which they resemble a surfactant.

PTW preparations with various atmospheric and dissolved gas species in DW. PTW was prepared by discharging the LF plasma jet in the presence of controlled atmospheric and dissolved gases. O2- adduct-forming potential and bactericidal activity of PTW were measured. (A) Signal intensity of the O2- adduct, as determined by ESR. (B) Bactericidal activity against E. coli. Helium, nitrogen, oxygen, and synthetic air were used as atmospheric and dissolved gases; bactericidal activity was evaluated by MIC. Image taken from Satoshi Ikawa et al 2016 J. Phys. D: Appl. Phys. 49 425401. IOP Publishing, All Rights Reserved.

Bactericidal plasma-treated water formed with nitrogen

By Dean Williams on October 4, 2016

Peroxynitric acid formed in water by plasma exposure is a key molecule for bactericidal effect.