Abstract
As hybrid nanostructures have become more important in many fields of chemistry, Ag nanoparticles (NPs) are being increasingly immobilized onto Fe3O4 microspheres in situ. Structural characterization reveals that the Ag NPs are uniformly immobilized in the Fe3O4 microsphere-based supports. Moreover, Ag NPs are more stable in the hybrid structure than in the naked state and show high catalytic activity for the reduction of nitro compounds and hydration of nitriles to amides in water. The Fe3O4 microspheres were recycled several times using an external magnet.
Highlights
In recent years, numerous attempts have been made toward designing and synthesizing hybrid nanostructures, which combine or even improve the physical and chemical properties of the constituent parts [1]
Among the three factors of reaction time, temperature, and quantity of catalyst, we found that the reaction temperature was the most important because the conversion decreased drastically at 120 °C
Ag NPs were immobilized onto Fe3O4 microspheres in situ by substituting sodium cations with Ag ions
Summary
Numerous attempts have been made toward designing and synthesizing hybrid nanostructures, which combine or even improve the physical and chemical properties of the constituent parts [1]. The presence of multicomponent functions combined with the enhanced chemical and physical properties make hybrid nanostructures suitable for research fields pertaining to Molecules 2014, 19 the study of magnetic, plasmonic, and semiconducting properties [4]. Fe3O4 microspheres have been used as supports for the immobilization of metal NPs in nanocatalysis because of the ease of their recyclability using external magnets after the reactions [13]. Ag NP, immobilized onto Fe3O4 microspheres were synthesized and tested as a catalyst in reduction of nitro compounds and nitrile hydration reactions in water (Scheme 1). The monodisperse Ag NPs were immobilized without any pretreatment such as attaching functional groups onto the Fe3O4 microspheres This catalyst showed increased Ag NP stability and could be recycled using an external magnet after the completion of the reaction
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