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Issue 55, 2016, Issue in Progress

Hierarchical core–shell structured Fe3O4@NiSiO3 magnetic microspheres: preparation, characterization, and adsorption of methylene blue from aqueous solution

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Abstract

Hierarchical core–shell structured Fe3O4@NiSiO3 magnetic microspheres have been synthesized using a modified Stöber sol–gel process and solvothermal methods. The prepared composites were investigated by SEM-EDS, TEM, XRD, FTIR, SQUID magnetometry, and nitrogen adsorption/desorption measurements. The microspheres possess high porosity and magnetic properties, which allow the Fe3O4@NiSiO3 microspheres to exhibit efficient adsorption capacity and convenient separation. The adsorption isotherm and adsorption kinetics for the adsorption of methylene blue (MB) on the Fe3O4@NiSiO3 microspheres were analyzed. The adsorption isotherm is well fitted by the Langmuir isotherm model, which is valid for monolayer adsorption of MB on the surface of Fe3O4@NiSiO3 magnetic microspheres. The pseudo-second-order model accurately describes the adsorption kinetics process for the adsorption of MB on the Fe3O4@NiSiO3 microspheres, suggesting a chemical adsorption process. MB removal of the Fe3O4@NiSiO3 magnetic microspheres can reach 87% after the fifth adsorption, indicating good regeneration capacity and reusability.

Graphical abstract: Hierarchical core–shell structured Fe3O4@NiSiO3 magnetic microspheres: preparation, characterization, and adsorption of methylene blue from aqueous solution

Supplementary files

Article information


Submitted
14 Jan 2016
Accepted
09 May 2016
First published
11 May 2016

RSC Adv., 2016,6, 49769-49776
Article type
Paper

Hierarchical core–shell structured Fe3O4@NiSiO3 magnetic microspheres: preparation, characterization, and adsorption of methylene blue from aqueous solution

S. Yuan and L. Zhao, RSC Adv., 2016, 6, 49769 DOI: 10.1039/C6RA01142J

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