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Manganese Oxide Nanoparticle Synthesis by Thermal Decomposition of ManganeseII Acetylacetonate
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Thallium Sorption onto Manganese Oxides.

Silvan Wick1,2, Jasquelin Peña3, Andreas Voegelin1

  • 1Eawag, Swiss Federal Institute of Aquatic Science and Technology , Üeberlandstrasse 133 , CH-8600 Dübendorf , Switzerland.

Environmental Science & Technology
|November 2, 2019
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Summary

Thallium (Tl) strongly sorbs to manganese (Mn) oxides like δ-MnO2 through oxidation, impacting its environmental behavior. Other Mn oxides show weaker Tl binding, mainly through non-oxidative mechanisms.

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Area of Science:

  • Environmental Science
  • Geochemistry
  • Materials Science

Background:

  • Thallium (Tl) sorption onto manganese (Mn) oxides is crucial for its environmental fate and water treatment.
  • Quantitative and mechanistic understanding of Tl sorption on Mn oxides remains limited.

Purpose of the Study:

  • To investigate the uptake of dissolved Tl(I) by environmentally relevant phyllo- and tectomanganates.
  • To determine the oxidation state and local coordination of sorbed Tl using X-ray absorption spectroscopy.

Main Methods:

  • Investigated Tl(I) uptake by phyllo- and tectomanganates.
  • Utilized X-ray absorption spectroscopy (XAS) to analyze sorbed Tl.
  • Quantified sorption affinity using distribution coefficients (Kd).

Main Results:

  • δ-MnO2 exhibits extremely strong Tl sorption (log Kd ≥ 7.4) at low concentrations due to oxidative uptake.
  • Non-oxidative Tl uptake dominates only at very high Tl(I) concentrations (>10-6 M).
  • Reduced δ-MnO2, birnessite, and todorokite show lower Tl sorption affinities compared to pristine δ-MnO2.

Conclusions:

  • Oxidative uptake is the primary mechanism for strong Tl sorption onto vacancy-containing δ-MnO2.
  • Structural properties of Mn oxides significantly influence Tl sorption affinity and mechanisms.
  • Findings enhance understanding of Tl behavior in natural and engineered systems.