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Frozen Hydrogen Peroxide and Nitrite Solution: The Acceleration of Benzoic Acid Oxidation via the Decreased pH in Ice

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Cited 1 time in scopus
Title
Frozen Hydrogen Peroxide and Nitrite Solution: The Acceleration of Benzoic Acid Oxidation via the Decreased pH in Ice
Other Titles
동결된 과산화수소와 아질산염 용액: 얼음 내 pH 저하에 따른 벤조산 산화의 가속화
Authors
Ahn, Yong-Yoon
Kim, Jungwon
Kim, Kitae
Subject
EngineeringEnvironmental Sciences & Ecology
Keywords
iceperoxynitrous acidbenzoic acidnitrous acidfreeze concentration
Issue Date
2022-02-15
Citation
Ahn, Yong-Yoon, Kim, Jungwon, Kim, Kitae. 2022. "Frozen Hydrogen Peroxide and Nitrite Solution: The Acceleration of Benzoic Acid Oxidation via the Decreased pH in Ice". ENVIRONMENTAL SCIENCE & TECHNOLOGY, 56(4): 2323-2333.
Abstract
We investigated benzoic acid oxidation via the reaction of hydrogen peroxide (H2O2) and nitrite (NO2 -). The oxidation of benzoic acid by reactive nitrous acid (HONO) was negligible, and the reactivity of the H2O2/NO2- system decreased with a decrease in temperature under aqueous conditions. However, freezing markedly accelerated the chemical reaction. Based on Raman microscope measurements, concentrated species were confirmed in certain regions of the ice. We proposed that the change in nitrite speciation (accordingly, a decrease in the pH below pKa), derived from the freezing concentration effect, was the reason for the accelerated reactions. The oxidation characteristics of the system were monitored under varying conditions, such as initial pH, dosage ratio, benzoic acid concentration, and reaction with various benzene derivatives. The ultrahigh-performance liquid chromatography/electrospray ionization/mass spectrometry (UHPLC/ESI/MS) measurement showed that peroxynitrous acid (HOONO)-mediated oxidation generated hydroxylated and nitrated byproducts. Additionally, decarboxylated products were detected, indicating direct electron transfer from the organic compounds to HOONO. As freezing is a global phenomenon, and H2O2 and NO2- are ubiquitous in the environment, the transformation of aromatic compounds with H2O2/NO2- in cold environments must be considered in environmental chemistry.
URI
https://repository.kopri.re.kr/handle/201206/13825
DOI
http://dx.doi.org/10.1021/acs.est.1c05705
Type
Article
Station
기타()
Indexed
SCIE
Appears in Collections  
2021-2021, Investigation of ice microstructure properties for developing low-temperature purification and environment/energy materials (21-21) / Kim, Kitae (PE21120)
2021-2021, Development of potential candidates as antibiotics based on polar genetic resources (21-21) / Lee, Jun Hyuck (PM21030)
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