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Effect of cation insertion on the stability of gliding arc plasma-precipitated mesoporous MnO2 dye bleaching catalysts

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Abstract

α-MnO2 and γ-MnO2 polymorphs were, respectively, obtained from the plasma precipitation of KMnO4 and Mn(CH3COO)3⋅2H2O precursors. The obtained powders were calcined at 150 °C, 210 °C and 400 °C, and characterized by X-ray diffraction, Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR), Thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS), nitrogen physisorption and Scanning electron microscopy (SEM). As a result, the calcination does not significantly affect textural properties and crystalline structure of the α-MnO2, while γ-MnO2 is transformed into β-MnO2 for temperatures above 400 °C. The thermal stability α-MnO2 is due to the K+ ions insertion in its 4.6 Å × 4.6 Å tunnels and corroborated the catalytic performance of 100, 98, 98 and 97% compared to 71, 54, 52 and 48% for γ-MnO2 after four successive reuse cycles on Tartrazine Yellow dye. The insertion of cationic species (K+, Na+, Mg2+) into the structure of MnO2 reinforces its crystalline structure and promotes the formation of powerful oxidizing species through oxygen vacant sites.

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Acknowledgments

We are grateful to the “Université catholique de Louvain” for scholarship given to F.W. Boyom Tatchemo from the “Coopération au développement” program.

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Authors and Affiliations

  1. Institute of Condensed Matter and Nanosciences (IMCN), Université Catholique de Louvain, Place Louis Pasteur 1, L4.01.09, 1348, Louvain-La-Neuve, Belgium

    Franck W. Boyom-Tatchemo, François Devred & Eric M. Gaigneaux

  2. Department of Inorganic Chemistry, University of Yaoundé I, P.O. Box 812, Yaoundé, Cameroon

    Franck W. Boyom-Tatchemo, Elie Acayanka, Georges Kamgang-Youbi & Samuel Laminsi

  3. School of Wood, Water and Natural Resources, Faculty of Agronomy and Agricultural Sciences, University of Dschang, P.O. Box 786, Ebolowa, Cameroon

    Serge Nzali

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Contributions

FWBT: Investigation, Conceptualization, Methodology, Data treatment and interpretation, Writing—original draft, Writing—review & editing. FD: XPS characterization, Data treatment and review. EA: Review & editing. GKY: Review & editing. SN: Review & editing. SL: Resources, Supervision. EG: Funding acquisition, Project administration, Conceptualization, Supervision, Data treatment and interpretation, Resources, Writing—review & editing, Validation.

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Boyom-Tatchemo, F.W., Devred, F., Acayanka, E. et al. Effect of cation insertion on the stability of gliding arc plasma-precipitated mesoporous MnO2 dye bleaching catalysts. Journal of Materials Research 38, 4144–4156 (2023). https://doi.org/10.1557/s43578-023-01129-z

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