Sustained production of superoxide radicals by manganese oxides under ambient dark conditions
文献类型：期刊论文
| 作者 | Zhang, Suhuan; Lv, Jitao; Han, Ruixia ; Wang, Zhe; Christie, Peter; Zhang, Shuzhen
|
| 刊名 | WATER RESEARCH
 |
| 出版日期 | 2021-05-15 |
| 卷号 | 196页码:- |
| 关键词 | Manganese oxides Mn(III) Superoxide radicals Halophenols Flow chemiluminescence |
| ISSN号 | 0043-1354 |
| 英文摘要 | 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(center dot-)) by various MnO2 polymorphs in the dark was quantified and the mechanisms involved were explored. The results confirm that O-2(center dot-) was produced through one-electron transfer from surface Mn(III) to adsorbed O-2. In contrast, no H2O2 was detected due to its decomposition by Mn oxides to form O-2(center dot-)- and Mn(III), leading to the sustained production of O-2(center dot-) on Mn oxide surfaces. In addition, the production of O-2(center dot-) was found to make a clear contribution (4 - 28%) to the transformation of a series of halophenols by MnO2, suggesting that the O-2(center dot-)-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(center dot-) in the natural environment. (C) 2021 Elsevier Ltd. All rights reserved. |
| WOS研究方向 | Engineering, Environmental ; Environmental Sciences ; Water Resources |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/45848]  |
| 专题 | 生态环境研究中心_环境化学与生态毒理学国家重点实验室 |
| 作者单位 | 1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Environm Chem & Ecotoxicol, Beijing 100085, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhang, Suhuan,Lv, Jitao,Han, Ruixia,et al. Sustained production of superoxide radicals by manganese oxides under ambient dark conditions[J]. WATER RESEARCH,2021,196:-. |
| APA | Zhang, Suhuan,Lv, Jitao,Han, Ruixia,Wang, Zhe,Christie, Peter,&Zhang, Shuzhen.(2021).Sustained production of superoxide radicals by manganese oxides under ambient dark conditions.WATER RESEARCH,196,-. |
| MLA | Zhang, Suhuan,et al."Sustained production of superoxide radicals by manganese oxides under ambient dark conditions".WATER RESEARCH 196(2021):-. |
入库方式： OAI收割
来源：生态环境研究中心
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