Magnetically Separable and Recyclable Fe3O4-Supported Ag Nanocatalysts for Reduction of Nitro Compounds and Selective Hydration of Nitriles to Amides in Water

Abstract

Abstract:As hybrid nanostructures have become more important in many fields of chemistry, Ag nanoparticles (NPs) are being increasingly immobilized onto Fe 3 O 4 microspheres in situ. Structural characterization reveals that the Ag NPs are uniformly immobilized in the Fe 3 O 4 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 Fe 3 O 4 microspheres were recycled several times using an external magnet.

A novel approach for the synthesis of ultrathin silica-coated iron oxide nanocubes decorated with silver nanodots (Fe3O4/SiO2/Ag) and their superior catalytic reduction of 4-nitroaniline

“…Additionally, the catalytic activity of several recently reported highly active catalysts were compared with our synthesized material. For samples of spherical Fe 3 O 4 / SiO 2 /Ag nanoparticles, several groups have succeeded in reducing 4-nitrophenol (a nitro organic compound) within a reaction time between 10 and 14 min 1,31,58 with nearly identical concentration of materials. Nevertheless, other groups have succeeded in completely converting 4-nitrophenol to 4-aminophenol within 240-300 seconds; however, they substituted the silver with expensive gold nanoparticles within the identical structure of MNPs/SiO 2 /Au nanoparticles.…”

Noncovalently functionalized carbon nanotubes immobilized Fe–Bi bimetallic oxides as a heterogeneous nanocatalyst for reduction of nitroaromatics

“…At the same time, azoxy, azo and hydrazo compounds were usually generated. Many researches have been reported to enhance the chemoselectivity, such as exploring novel supporters, improving the structures of the metal catalyst and introducing multicomponent [22,23]. Still, the limited availability and high price of the noble metals impede their abundant application in industry [24].…”

Fe3O4 – Glutathione stabilized Ag nanoparticles: A new magnetically separable robust and facile catalyst for aqueous phase reduction of nitroarenes

“…An additional benefit of using glutathione is the presence of the highly reactive thiol group, which could be used for anchoring to the nano‐ferrite surfaces, keeping active sites free for catalysis. The support needed to be chemically stable, convenient for the immobilization of Ag NPs as powdered Ag NPs were not suitable for large scale applications in heterogeneous catalysis because they tend to aggregated owing to their high surface energy, thus resulting in a rapid reduction of their catalytic activity . Ag NPs furthermore difficult to be separated and recycled from the reaction solution because of their ultrafine size.…”