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Natural manganese oxide: Combined analytical approach for solid characterization and arsenic retention |
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| Authors: | S. Ouvrard Ph. de Donato S. Begin M. Alnot F. Lhote M. Sardin |
| Affiliation: | 1 Laboratoire Sols et Environnement, ENSAIA-INPL/INRA, 2 avenue de la Forêt de Haye, BP 172, 54505 Vandoeuvre-lès-Nancy Cedex, France 2 Centre de Recherche F. Fiessinger, LEM UMR CNRS 7569, ENSG-INPL, 15 avenue du Charmois, BP 40, 54501 Vandoeuvre, France 3 Laboratoire des Sciences du Génie Chimique, CNRS/ENSIC-INPL, 1 rue Grandville, BP 451, 54001 Nancy Cedex, France 4 EEIGM INPL, 6 rue Bastien Lepage, 54000 Nancy, France 5 Laboratoire de Science et Génie des Matériaux et de Métallurgie, Mines-INPL, Parc de Saurupt, 54042 Nancy, France 6 Service Commun de Microscopie Electronique à Transmission (SCMET), Université Henri Poincaré, Faculté des Sciences et Techniques, Boulevard des Aiguillettes, BP 239, 54506 Vandoeuvre-lès-Nancy Cedex, France 7 Laboratoire de Physique des Matériaux, Université Henri Poincaré, Boulevard des Aiguillettes, BP 239, 54506 Vandoeuvre-lès-Nancy Cedex, France |
| Abstract: | To understand the retention of As on a natural manganese sand, the structural, textural and chemical properties of the solid were first investigated by combining scanning electron microscopy (SEM), transmission electron microscopy (TEM), electron-energy-loss spectroscopy (EELS), X-ray diffraction (XRD), BET N2 gas adsorption, diffuse reflectance Fourier transform infrared (FT-IR) spectroscopy and X-ray photoelectron spectroscopy (XPS) analysis. Manganese sand could be mainly described as a mixture of a phyllomanganate, lithiophorite [(Al,Li)MnO2(OH)2], and pyrolusite (MnO2). Iron particle, kaolinite and gibbsite type-phases were also observed. Particles organization led to the presence of a mesoporosity with pore diameters ranging from 100 to 200 Å and a specific surface area of 23 m2 g−1. Contact with an As(V) solution (0.67 mmol L−1) led to an average fractional surface coverage of 0.4. Both As (V) and (III) were present on the surface of the sand in a 1:1 ratio. As(V) was sorbed on lithiophorite-type particles through surface complexation type reaction. As(III) was thought to result from As(V) reduction mechanism on iron particles. |
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