Chromium substituted nickel ferrites (NiFe2−xCrxO4, x = 0.0, 0.1, 0.2, 0.3, and 0.4) magnetically recoverable reusable heterogeneous nano catalysts

Abstract

Nano ferrite particles were synthesized by oxalate precursor method, characterized by TGA/DTA analysis to know the pattern of decomposition, an elemental stoichiometry confirmed by EDAX method. The X-ray diffraction (XRD) and Infra-Red patterns were used to determine structural parameters, indicate the formation of single-phase cubic spinal structure. The average crystalline size was calculated from FWHM of most intensive pick 311, also confirmed from TEM analysis observe in the range of 29–34 nm. The structural parameters like lattice constant, X-ray density, bulk density and porosity increases with Cr3+ ion concentration. The magnetic parameters like saturation magnetizations and magnetic moments shown decreasing tendency. Bis-(4-hydroxycoumarin) methane derivatives successfully synthesized from 4 hydroxycoumarin 1) aromatic aldehydes 2, and using 20 mol % NiFe2−xCrxO4 nanoparticles as magnetically recoverable and reusable catalyst.