globalchange  > 气候变化与战略
DOI: 10.1073/pnas.2002175117
论文题名:
Anoxic photogeochemical oxidation of manganese carbonate yields manganese oxide
作者: Liu W.; Hao J.; Elzinga E.J.; Piotrowiak P.; Nanda V.; Yee N.; Falkowski P.G.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2020
卷: 117, 期:37
起始页码: 22698
结束页码: 22704
语种: 英语
Scopus关键词: carbonic acid derivative ; hydrogen ; manganese ; manganese derivative ; manganese oxide ; manganite ; mineral ; oxygen ; rhodochrosite ; unclassified drug ; Archean ; Article ; controlled study ; geochemistry ; headspace extraction ; infrared spectroscopy ; molecular evolution ; oxidation ; photogeochemistry ; photon ; photooxidation ; photoreactivity ; priority journal ; quantum yield ; scanning electron microscopy ; stratosphere
英文摘要: The oxidation states of manganese minerals in the geological record have been interpreted as proxies for the evolution of molecular oxygen in the Archean eon. Here we report that an Archean manganese mineral, rhodochrosite (MnCO3), can be photochemically oxidized by light under anoxic, abiotic conditions. Rhodochrosite has a calculated bandgap of about 5.4 eV, corresponding to light energy centering around 230 nm. Light at that wavelength would have been present on Earth’s surface in the Archean, prior to the formation of stratospheric ozone. We show experimentally that the photooxidation of rhodochrosite in suspension with light centered at 230 nm produced H2 gas and manganite (γ-MnOOH) with an apparent quantum yield of 1.37 × 10−3 moles hydrogen per moles incident photons. Our results suggest that manganese oxides could have formed abiotically on the surface in shallow waters and on continents during the Archean eon in the absence of molecular oxygen. © 2020 National Academy of Sciences. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164044
Appears in Collections:气候变化与战略

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作者单位: Liu, W., Department of Earth and Planetary Sciences, Rutgers University, Piscataway, NJ 08854, United States; Hao, J., Department of Marine and Coastal Sciences, Rutgers University, New Brunswick, NJ 08901, United States; Elzinga, E.J., Department of Earth and Environmental Sciences, Rutgers University–Newark, Newark, NJ 07102, United States; Piotrowiak, P., Department of Chemistry, Rutgers University–Newark, Newark, NJ 07102, United States; Nanda, V., Department of Biochemistry and Molecular Biology, Center for Advanced Biotechnology and Medicine, Rutgers University, Piscataway, NJ 08854, United States; Yee, N., Department of Earth and Planetary Sciences, Rutgers University, Piscataway, NJ 08854, United States; Falkowski, P.G., Department of Earth and Planetary Sciences, Rutgers University, Piscataway, NJ 08854, United States, Department of Marine and Coastal Sciences, Rutgers University, New Brunswick, NJ 08901, United States

Recommended Citation:
Liu W.,Hao J.,Elzinga E.J.,et al. Anoxic photogeochemical oxidation of manganese carbonate yields manganese oxide[J]. Proceedings of the National Academy of Sciences of the United States of America,2020-01-01,117(37)
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