Catalysis of the hydro-dechlorination of 4-chlorophenol and the reduction of 4-nitrophenol by Pd/Fe3O4@SiO2@m-SiO2

Abstract

In this study, Pd nanoparticles functionalized on the surface of a Fe₃O₄@SiO₂@m-SiO₂ nano-catalyst has been synthesised with accessible active sites and ultra-large surface areas. The Pd/Fe₃O₄@SiO₂@m-SiO₂ nano-catalyst can be recovered by applying an external magnetic field. The catalytic activity of Pd/Fe₃O₄@SiO₂@m-SiO₂ is tested in the catalytic reduction of 4-nitrophenol and the hydrodechlorination of 4-chlorophenol. The high catalytic activity is attributed to the well-dispersed Pd nanoparticles on the ultra-large surface of Fe₃O₄@SiO₂@m-SiO₂. Furthermore, the Pd/Fe₃O₄@SiO₂@m-SiO₂ nano-catalyst can be reused at least five times without significant loss in activity, which confirms its good stability. Therefore, the approach mentioned above that is based on core–shell structured magnetic Pd/Fe₃O₄@SiO₂@m-SiO₂ provides a useful platform for the fabrication of Pd NP based catalysts that feature easy accessibility, superior activity and convenient recovery.