Issue 16, 2014

Chemically stable magnetic nanoparticles for metal adsorption and solid acid catalysis in aqueous media

Abstract

We have developed a magnetically collectable, reusable adsorbent and a catalyst for concentrating heavy metal ions in acidic aqueous solutions and solid acid catalysis in aqueous media. Chemically stable, magnetic rattle-type core–shell particles, comprising metallic cobalt nanoparticles in hollow silica microspheres, were prepared by the sol–gel reaction of alkylsilyl trichlorides around water droplets in a water-in-oil emulsion. Sulfonic groups were immobilized on the external surface of the core–shell particles through silylation with 3-mercaptopropyl(trimethoxysilane) and subsequent oxidization of the thiol groups by nitric acid. The sulfonic groups acted as adsorption sites for Zn and Pb ions under acidic conditions and as catalytically active sites for the hydrolysis of ethyl acetate in aqueous media. The enclosed Co was not eroded during the regeneration of the adsorbent/catalyst by 1 M HCl. The chemical stability arose from the dense non-porous shell, which prevents the passage of solvents.

Graphical abstract: Chemically stable magnetic nanoparticles for metal adsorption and solid acid catalysis in aqueous media

Supplementary files

Article information

Article type
Paper
Submitted
27 Dec 2013
Accepted
07 Feb 2014
First published
07 Feb 2014

J. Mater. Chem. A, 2014,2, 5751-5758

Author version available

Chemically stable magnetic nanoparticles for metal adsorption and solid acid catalysis in aqueous media

T. Okada, Y. Takeda, N. Watanabe, T. Haeiwa, T. Sakai and S. Mishima, J. Mater. Chem. A, 2014, 2, 5751 DOI: 10.1039/C3TA15405J

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