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- W3081285980 endingPage "128082" @default.
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- W3081285980 abstract "As important natural oxidants and adsorbents, manganese (Mn) oxide minerals affect the speciation, bioavailability and fate of pollutants and nutrient elements. It was found that birnessite-type Mn(IV) oxide minerals can be formed in the presence of NO3− and solar irradiation. However, the photochemical formation and transformation processes from Mn2+ to Mn(IV) oxide minerals remain unclear. In this work, the Mn(IV) oxide minerals were confirmed to be photochemically formed mainly due to the disproportionation of Mn(III) intermediates generated from the oxidation of Mn2+ in the presence of NO3− under UV light irradiation. The oxidation rate of Mn2+ to Mn(IV) oxide minerals decreased with increasing initial Mn2+ concentration due to the lower disproportionation rate. The increase in NO3− concentration, pH and temperature promoted Mn2+ photochemical oxidation. The photochemical formation rate of Mn(IV) oxide minerals increased with increasing ligand concentrations at low ligand concentrations. Ligands affected the formation of Mn(IV) oxide minerals by promoting the formation and reducing the reactivity of Mn(III) intermediates. Overall, this work reveals the important role of Mn(III) intermediates in the formation of natural Mn oxide minerals." @default.
- W3081285980 created "2020-09-01" @default.
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- W3081285980 date "2021-01-01" @default.
- W3081285980 modified "2023-10-12" @default.
- W3081285980 title "Formation and transformation of manganese(III) intermediates in the photochemical generation of manganese(IV) oxide minerals" @default.
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- W3081285980 doi "https://doi.org/10.1016/j.chemosphere.2020.128082" @default.
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