The preparation of [email protected] core–shell nanoparticles immobilized on yolk–shell Fe3O4@polyaniline composites is reported. Fe3O4 nanoclusters were first synthesized through the solvothermal method and then the SiO2 shell was coated on the Fe3O4 surface via a
sol–gel process. To prepare Fe3O4@SiO2@polyaniline composites, polyvinylpyrrolidone was first grafted on to the surface of Fe3O4@SiO2
composites and subsequently polymerization of aniline was carried out via an ultrasound‐assisted in situ surface polymerization method. Selective etching of the middle
SiO2 layer was then accomplished to obtain the yolk–shell Fe3O4@polyaniline composites. The approach uses polyaniline (PANI) conductive polymer as a template for the synthesis of [email protected] core–shell nanoparticles. The catalytic
activity of the synthesized yolk–shell Fe3O4@PANI/[email protected] composite was investigated in the reduction of o‐nitroaniline to benzenediamine by NaBH4, which exhibited conversion of 99% in 3 min with a very low content
of the catalyst. Transmission electron microscopy, X‐ray photoelectron spectroscopy, TGA, X‐ray diffraction, UV–visible, scanning electron
microscopy, X‐ray energy dispersion spectroscopy and FT‐IR were employed to characterize the synthesized nanocatalyst. Copyright © 2014 John Wiley & Sons, Ltd.
The preparation of [email protected] core‐shell nanoparticles immobilized on the yolk‐shell Fe3O4@polyaniline composites is reported. The catalytic activity of yolk‐shell Fe3O4@PANI/[email protected] composite was investigated in reduction of o‐nitroaniline
to benzenediamine by NaBH4.
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