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Research Article

Flocculation and magnetically-assisted sedimentation of size-sorted beidellite platelets mixed with maghemite nanoparticles

Sofia Housni1, Sébastien Abramson1( ), Jean-Michel Guigner2, Pierre Levitz1, Laurent Michot1
Laboratoire de PHysico-chimie des Electrolytes et Nanosystèmes InterfaciauX (PHENIX UMR 8234, Sorbonne Université - CNRS), Sorbonne Université, Paris 75252, France
Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie (IMPMC UMR 7590, Sorbonne Université - IRD - CNRS - MNHN), Sorbonne Université, Paris 75252, France
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Abstract

In this study, the flocculation and the subsequent decantation step of mixed suspensions of 10 nm-sized γ-Fe2O3 magnetic nanoparticles and 500 nm-sized beidellite clay platelets was investigated. This work may find application in the field of water treatment, specifically the flocculation processes with magnetically assisted sedimentation. After a short description of the preparation and characterization of the raw materials (nanoparticles and clays), the influence of several parameters (pH, concentrations of nanoparticles and clays etc.) on the amount of flocculated materials was examined, which gave information on the concentration ranges allowing a complete flocculation, together with a better understanding on the interactions between nanoparticles and clays responsible for flocculation. The optimal conditions for magnetically assisted settling were then determined by comparing for each sample sedimentation velocities under gravity and in the presence of a Nd-Fe-B magnet. Finally, the complex multiscale structure of the flocs in water was explored, through the measurement of several bulk properties (zeta-potential and volume measurements, laser granulometry), while the organization of the materials at a microscopic scale was investigated by cryo-transmission electron microscopy (cryo-TEM) and small-angle X-ray scattering (SAXS).

Keywords

magnetic separationnanoparticlesclayflocculationdecantationcharacterization

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Nano Research
Volume 13 Issue 11,
November 2020
Pages 3001-3011
DOI: 10.1007/s12274-020-2964-9
Cite this article:
Housni S, Abramson S, Guigner J-M, et al. Flocculation and magnetically-assisted sedimentation of size-sorted beidellite platelets mixed with maghemite nanoparticles. Nano Research, 2020, 13(11): 3001-3011. https://doi.org/10.1007/s12274-020-2964-9
Topics:
High resolution transmission electron microscopyIron alloysX-ray scattering

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Received: 23 April 2020
Revised: 29 June 2020
Accepted: 30 June 2020
Published: 04 August 2020
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020
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