Investigation on structural, optical and photocatalytic activity of CoMn2O4 nanoparticles prepared via simple co-precipitation method

Abstract The tetragonal spinel Cobalt manganite (CoMn2O4) nanoparticles (NPs) were prepared successfully via the co-precipitation route. The crystal structure and phase purity was primarily confirmed by the PXRD pattern. The optical band gap of the prepared CoMn2O4 NPs was found to be 1.70 and 2.0 eV. The morphological analysis of CoMn2O4 NPs was carried out by SEM images. The EDX spectrum gives the elemental composition of the prepared CoMn2O4 NPs. The FTIR and PL spectrum gives details of the functional groups and crystal defects presents in the synthesized sample. Magnetic property of the prepared sample was analyzed using Vibrating Sample Magnetometer (VSM). The photocatalytic activity of the CoMn2O4 NPs was performed against the organic dyes such as Methylene Blue (MB), Malachite Green (MG) and Congo Red (CR) under direct sunlight. The degradation efficiency was achieved to be 87.80%, 79.43% and 52.78% respectively for MG, MB, and CR dyes.