Mohammad Reza Nabid,Yasamin Bide,Nastaran Ghalavand,Mahvash Niknezhad
Applied Organometallic Chemistry, Volume28, Issue6 Pages 389-395
The preparation of Ni@Pd 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 Ni@Pd core–shell nanoparticles. The catalytic activity of the synthesized yolk–shell Fe3O4@PANI/Ni@Pd 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.

©  تمامی حقوق متعلق به سازمان پژوهش‌های علمی و صنعتی ایران می باشد.