Nanosilver embedded on hydroxyapatite-encapsulated γ-Fe2O3: Superparamagnetic catalyst for chemoselective oxidation of primary amines to N-monoalkylated hydroxylamines

A novel magnetically recoverable silver nano-catalyst was fabricated by the adsorption–reduction of Ag (I) ions on the surface of hydroxyapatite encapsulated iron oxide nanoparticles. The magnetic catalyst could be easily separated by the application of an external magnetic field. The samples have been characterized by VSM, X-ray diffraction (XRD) and scanning and transmission electron microscopy (SEM and TEM), which reveal the superparamagnetic nano-nature of the particles. From these studies we can infer that the particles are mostly spherical in shape and have an average size of 10 nm. The catalytic ability of the Ag nanoparticles supported on the magnetic nanocarier was found to be excellent and they cleanly oxidize primary amines to N-monoalkylated hydroxylamines.

Figure optionsDownload high-quality image (128 K)Download as PowerPoint slideResearch highlights▶ The silver supported onto HAp-encapsulated-γ-Fe2O3 is an ideal biomaterial as magnetically recoverable catalyst. ▶ Chemoselective oxidation of primary amines. ▶ Clean, green and low-cost methodology in the oxidation of primary amines to N-monoalkylated hydroxylamines.