Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

Tytuł pozycji:

Sustained production of superoxide radicals by manganese oxides under ambient dark conditions.

Tytuł:
Sustained production of superoxide radicals by manganese oxides under ambient dark conditions.
Autorzy:
Zhang S; State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of the Chinese Academy of Sciences, Beijing 100049, China.
Lv J; State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China. Electronic address: .
Han R; State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of the Chinese Academy of Sciences, Beijing 100049, China.
Wang Z; State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of the Chinese Academy of Sciences, Beijing 100049, China.
Christie P; State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
Zhang S; State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of the Chinese Academy of Sciences, Beijing 100049, China. Electronic address: .
Źródło:
Water research [Water Res] 2021 May 15; Vol. 196, pp. 117034. Date of Electronic Publication: 2021 Mar 10.
Typ publikacji:
Journal Article
Język:
English
Imprint Name(s):
Original Publication: Oxford, Pergamon Press.
MeSH Terms:
Manganese Compounds*
Oxides*
Manganese ; Oxidation-Reduction ; Superoxides
Contributed Indexing:
Keywords: Flow chemiluminescence; Halophenols; Manganese oxides; Mn(III); Superoxide radicals
Substance Nomenclature:
0 (Manganese Compounds)
0 (Oxides)
11062-77-4 (Superoxides)
42Z2K6ZL8P (Manganese)
Entry Date(s):
Date Created: 20210323 Date Completed: 20210413 Latest Revision: 20210413
Update Code:
20240104
DOI:
10.1016/j.watres.2021.117034
PMID:
33756111
Czasopismo naukowe
Manganese (Mn) oxides are ubiquitous in the environment and have strong reactivity to induce the transformation of various contaminants. However, whether reactive oxygen species contribute to their surface reactivity remains unclear. Here, sustainable production of superoxide radicals (O 2 •- ) by various MnO 2 polymorphs in the dark was quantified and the mechanisms involved were explored. The results confirm that O 2 •- was produced through one-electron transfer from surface Mn(III) to adsorbed O 2 . In contrast, no H 2 O 2 was detected due to its decomposition by Mn oxides to form O 2 - and Mn(III), leading to the sustained production of O 2 •- on Mn oxide surfaces. In addition, the production of O 2 •- was found to make a clear contribution (4 - 28%) to the transformation of a series of halophenols by MnO 2 , suggesting that the O 2 •- -mediated surface reaction is an important supplement to the direct electron-transfer mechanism in the reactivity of Mn oxides. These findings advance our understanding of the surface reactivity of Mn oxides and also reveal an important but hitherto unrecognized abiotic source of O 2 •- in the natural environment.
Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2021. Published by Elsevier Ltd.)

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies