2024-03-28T09:33:37Z
https://soar-ir.repo.nii.ac.jp/oai
oai:soar-ir.repo.nii.ac.jp:00012318
2022-12-14T04:05:58Z
1221:1222
Chemically stable magnetic nanoparticles for metal adsorption and solid acid catalysis in aqueous media
Okada, T
Takeda, Y
Watanabe, N
Haeiwa, T
Sakai, T
Mishima, S
Copyright© 2014 Royal Society of Chemistry. / J. Mater. Chem. A, 2014,2, 5751-5758 https://doi.org/10.1039/C3TA15405J - Reproduced by permission of The Royal Society of Chemistry
Accepted 07 Feb 2014
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.
Article
JOURNAL OF MATERIALS CHEMISTRY A. 2(16):5751-5758 (2014)
ROYAL SOC CHEMISTRY
2014
eng
journal article
AM
http://hdl.handle.net/10091/17715
https://soar-ir.repo.nii.ac.jp/records/12318
https://doi.org/10.1039/c3ta15405j
10.1039/c3ta15405j
2050-7488
AA12603290
JOURNAL OF MATERIALS CHEMISTRY A
2
16
5751
5758
https://soar-ir.repo.nii.ac.jp/record/12318/files/Chemically_stable_magnetic_nanoparticles_metal.pdf
application/pdf
594.7 kB
2015-09-28