The Reaction Pathways of H2O2(aq) in the He Plasma Jet with a Liquid System

• Published in: Plasma chemistry and plasma processing Vol. 40; no. 4; pp. 1001 - 1018
• Main Authors: Qi, Zhihua, Zhang, Qiang, Zhu, Di, Ding, Zhenfeng, Niu, Jinhai, Liu, Dongping, Zhao, Yao, Xia, Yang, Zhao, Zhiguo, Wang, Xi
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.07.2020; Springer Nature B.V
• Subjects: Characterization and Evaluation of Materials; Chemistry; Chemistry and Materials Science; Classical Mechanics; Hydrogen peroxide; Inorganic Chemistry; Mechanical Engineering; Original Paper; Oxidation; Plasma; Plasma jets; Pressure effects; Removal; Plasma jet; H; OH; Scavenger; Isopropanol; O
• ISSN: 0272-4324; 1572-8986
• DOI: 10.1007/s11090-020-10065-3

Over the last two decades, atmospheric-pressure plasma has been investigated intensively as an advanced oxidation process for water. This current study is to focus on the generation mechanisms of H 2 O 2 in the liquid treated by atmospheric-pressure He plasma. The effect of H 2 O 2(aq) on the removal percentage of isopropanol (IPA) in liquid is evaluated after He plasma jet treatment. The effects of IPA as ·OH (g) and ·OH (aq) scavenger on the generation of H 2 O 2(aq) are studied by changing the initial IPA solution temperature. Our analysis indicates that H 2 O 2(aq) is mainly formed by the H 2 O 2(g) dissolution into liquid. The combination of ·OH (aq) is not important for the formation of H 2 O 2(aq) in liquid. When the exogenous H 2 O 2 is added into IPA solution, the IPA removal percentage can be improved by the He plasma jet treatment due to the fact that exogenous H 2 O 2 is decomposed to ·OH by e − , H radicals, and He and He 2 metastables. This study is important for understanding the reaction pathways of H 2 O 2(aq) in plasma treated liquid.