Year: 2025
Type: article
Abstract: High Resolution Image Download MS PowerPoint Slide Here, we investigate the effects of hydrodynamics and temperature on the formation of nitrous and nitric acids (HNO y =2,3 ) and their conjugate bases (NO y – ) in plasma-treated water (PTW) in a surface dielectric barrier discharge (sDBD) reactor. The stirring rate and bulk water temperature were systematically varied from 200 to 1000 rpm and 20 to 80 °C, respectively, while the plasma was held constant. Species in both the gas and liquid phases were tracked in real time using synchronized dual optical absorption spectroscopy, allowing correlation of the gas-phase O 3 /NO x =1–3 dynamics with the evolving aqueous species of NO 2 –, HNO 2, and NO 3 – . Nitrate production monotonically accelerated with increasing agitation and dominated above 800 rpm, whereas the nitrite pool, NO 2 – + HNO 2, peaked at a moderate speed of 600 rpm and declined at higher speeds, probably due to volatilization losses. Elevated water temperature suppressed NO and NO 2 formation, extended the O 3 -rich regime, and shifted selectivity toward NO 3 –; conversely, cooler conditions favored nitrite accumulation. These trends reveal the temperature-dependent kinetics and mass-transfer limits that govern plasma-driven nitrogen fixation. Our findings offer practical guidelines for tuning the composition of PTW, thereby advancing its efficient, application-specific production at scale.
Source: ACS Omega
Authors: Jin Hee Bae, Seong-Cheol Huh, Negar Rahdar, Hyungyu Lee, Sanghoo Park
Language: English
Subfield: Radiology, Nuclear Medicine and Imaging
Field: Medicine
Domain: Health Sciences
Open Access status: gold
Estimated APC paid: $1,935
Awards: G4143133350, G8320091160
OpenAlex ID: W4416922014