Facile green synthesis of l-methionine capped magnetite nanoparticles for adsorption of pollutant Rhodamine B

Abstract

Surface modified magnetite nanoparticles (Fe3O4 NPs) were synthesized by the one pot co-precipitation method using l-methionine (l-Met) as a capping agent. As synthesized Fe3O4 NPs have been characterized by using UV–Visible spectroscopy, FTIR spectroscopy, powder XRD, SEM-EDX and TEM. Magnetic property of l-Met capped Fe3O4 NPs was investigated by vibrating sample magnetometer (VSM). The XRD results indicated that formation of pure phase Fe3O4 NPs. The spectroscopic (FTIR and UV- Vis spectroscopy) results further confirm the effective capping of Fe3O4 NPs using l-Met. The VSM curve clearly depicts the superparamagnetic behavior of l-Met capped Fe3O4 NPs with saturation magnetization value of 65emu/g. The kinetic studies for Rhodamine B (RhB) adsorption showed rapid adsorption within the first 40min and sorption process best linear fitted to second-order kinetic model, suggesting chemisorption mechanism. Dye adsorption equilibrium data were fitted well to the Langmuir isotherm.