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 in | Inorganic and nano-metal chemistry Vol. 52; no. 1; pp. 42 - 52 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Taylor & Francis
02.01.2022
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Subjects | |
Online Access | Get full text |
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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. |
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ISSN: | 2470-1556 2470-1564 |
DOI: | 10.1080/24701556.2020.1862220 |