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Formation and transformation of manganese(III) intermediates in the photochemical generation of manganese(IV) oxide minerals

Journal Article · · Chemosphere
 [1];  [2];  [2];  [3];  [2]
  1. Huazhong Agricultural University, Hubei Province (China); Univ of Connecticut
  2. Huazhong Agricultural University, Hubei Province (China)
  3. University of Connecticut, Storrs, CT (United States)

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. Altogether, this work reveals the important role of Mn(III) intermediates in the formation of natural Mn oxide minerals.

Research Organization:
University of Connecticut, Storrs, CT (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division; National Key Research and Development Program of China; National Natural Science Foundation of China; Fundamental Research Funds for the Central Universities
Grant/Contract Number:
FG02-86ER13622
OSTI ID:
1776115
Alternate ID(s):
OSTI ID: 1837953
Journal Information:
Chemosphere, Journal Name: Chemosphere Vol. 262; ISSN 0045-6535
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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