Synthesis and characterization of cryptomelane (α-MnO2) nanoparticles: Influence of phthalic acid adsorption and oxidation on the mineral structure

Cryptomelane (α-MnO 2 ) nanoparticles synthesis was achieved via a Sol-Gel route in mild conditions. XRD analysis showed that the α-MnO 2 phase was of high purity and crystallized in the monoclinic space group I2/m, with 12 nm average crystallite size (D). After interaction with an organic pollutant...

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Published inInorganic and nano-metal chemistry Vol. 52; no. 1; pp. 42 - 52
Main Authors Naidja, A., Karaali, A., Mirouh, K., Stanjek, H.
Format Journal Article
LanguageEnglish
Published Taylor & Francis 02.01.2022
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Summary:Cryptomelane (α-MnO 2 ) nanoparticles synthesis was achieved via a Sol-Gel route in mild conditions. XRD analysis showed that the α-MnO 2 phase was of high purity and crystallized in the monoclinic space group I2/m, with 12 nm average crystallite size (D). After interaction with an organic pollutant (Phthalic acid, PA), excepting the pronounced decrease in β angle, α-MnO 2 cell parameters slightly changed, probably resulting from leaching of K + cations. Adsorption isotherm of PA on α-MnO 2 nanoparticles was fitted in L2 type Langmuir model. Accordingly, an outer-sphere PA-Mn surface complex was suggested. Further, the mineral oxide exerted a low activity in the decarboxylation of PA. Raman analysis illustrated the major bands, of α-MnO 2 , and their evolution after adsorption indicated the effect of PA on the phase structure, as revealed by the XRD Rietveld refinement. AFM analysis showed stick shaped nanoparticles with D = 15 nm, but the interaction with PA induced aggregation.
ISSN:2470-1556
2470-1564
DOI:10.1080/24701556.2020.1862220