Tunable Mn Oxidation State and Redox Potential of Birnessite Coexisting with Aqueous Mn(II) in Mildly Acidic Environments
Tunable Mn Oxidation State and Redox Potential of Birnessite Coexisting with Aqueous Mn(II) in Mildly Acidic Environments
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弱酸性环境中与水性 Mn(II) 共存的水钠锰矿的可调节 Mn 氧化态和氧化还原电位
DOI：
10.3390/min10080690
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发表时间：
2020-08
期刊：
影响因子：
2.5
通讯作者：
Zhang Baogang
中科院分区：
文献类型：
--
作者：
Liu Juan;Zhang Yixiao;Gu Qian;Sheng Anxu;Zhang Baogang
作为陆地和水生环境中主要的锰氧化物矿物相，水钠锰矿在许多生物地球化学过程中起着重要作用。在地下环境中通常会发现水钠锰矿与水溶液中的Mn2+共存。
As the dominant manganese oxide mineral phase in terrestrial and aquatic environments, birnessite plays an important role in many biogeochemical processes. The coexistence of birnessite with aqueous Mn2+ is commonly found in the subsurface environments undergoing Mn redox cycling. This study investigates the change in Mn average oxidation state (AOS) of birnessite after reaction with 0.1–0.4 mM Mn2+ at pH 4.5–6.5, under conditions in which phase transformation of birnessite by Mn2+ was not detectable. The amount of Mn2+ uptake by birnessite and the equilibrium concentration of Mn(III) proportionally increased with the initial concentration of Mn2+. The Mn AOS of birnessite particles became 3.87, 3.75, 3.64, and 3.53, respectively, after reaction with 0.1, 0.2, 0.3, and 0.4 mM Mn2+ at pH 5.5. Oxidation potentials (Eh) of birnessite with different AOS values were estimated using the equilibrium concentrations of hydroquinone oxidized by the birnessite samples, indicating that Eh was linearly proportional to AOS. The oxidation kinetics of bisphenol A (BPA), a model organic pollutant, by birnessite suggest that the logarithms of surface area-normalized pseudo-first-order initial rate constants (log kSA) for BPA degradation by birnessite were linearly correlated with the Eh or AOS values of birnessite with AOS greater than 3.64.
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影响因子：
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作者：
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Elzinga, Evert J.
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