Fe₃O₄ Nanoparticles Coated with Ag-Nanoparticle-Embedded Metal–Organic Framework MIL-100(Fe) for the Catalytic Reduction of 4-Nitrophenol

Abstract

A facile and efficient strategy is proposed to prepare Ag-nanoparticle-embedded magnetic metal−organic frameworks [MOFs; Fe 3 O 4 @MIL-100(Fe)/Ag]. The as-prepared nanocomposites are regular spherical and contain a Fe 3 O 4 core with an average diameter of 400 nm, which make them exhibit good magnetic properties and can be conveniently separated. A 50 nm MIL-100(Fe) MOF shell is uniformly coated on the Fe 3 O 4 core and loads well-dispersed 2.0 ± 0.8 nm Ag nanoparticles in their pores, which make the nanocomposites have excellent catalytic and recyclable performances for catalytic reduction of 4-nitrophenol. This production strategy is highly efficient and can be used to fabricate other similar porous nanocomposites.

Facile strategy for the synthesis of silver nanoparticles on magnetic Fe3O4@C core–shell nanocomposites and their application in catalytic reduction

“…The apparent decrease can be attributed to the occupation of Ag nanoparticles. 33,34 Upon further increases in the ratio to 1 : 3, the surface area increases to 99.24 m 2 g −1 . It is not clear why there is a significant increase in surface area, but we speculate that some small carbon nanotubes that appeared at higher concentrations of AgNO 3 might have opened additional pores in the carbon shell, making them available for N 2 adsorption.…”

Synthesis of MIL-Modified Fe3O4 Magnetic Nanoparticles for Enhancing Uptake and Efficiency of Temozolomide in Glioblastoma Treatment

“…Recently, Metal-Organic Frameworks (MOFs) coordination polymers consisting of metal nodes and polydentate organic linkers organized in open porous structures [ 18 , 19 ] and, among them, MILs (Materials Institute Lavoiser) an MOF subclass constituted by trivalent transition metals and bi- or tri-carboxylic ligands, showed great potentiality for biomedical applications either as pure crystals or as composite materials, because of their biocompatibility and capability of loading molecules in their porous structure [ 20 , 21 , 22 , 23 , 24 ]. Moreover, some paper reported on the possibility of combining magnetic nanoparticles with MILs structures either as composite materials made of MILs crystals decorated or loaded with magnetic Fe 3 O 4 nanoparticles [ 25 , 26 , 27 , 28 ] or core-shell systems in which an Fe 3 O 4 core is covered with a MIL shell [ 29 , 30 , 31 , 32 , 33 , 34 , 35 ]. In both cases typically particles sizes ranged from 200–500 nm.…”

Immobilization of Ag(0) nanoparticles on quaternary ammonium functionalized polyacrylonitrile fiber as a highly active catalyst for 4-nitrophenol reduction

“…Therefore, supported Ag(0) catalysts are more suitable for catalyzing the reduction reaction of 4-NP. Recently, many different materials including SBA-15, 19 GO, 20 polymers, 21,22 MCM-41, 23,24 magnetic Fe 3 O 4 , 25,26 SiO 2 (ref. 27 and 28) and MOFs 29,30 have been used as supports for preparation of immobilized silver catalysts.…”