Sono-assisted preparation of magnetic ferroferric oxide/graphene oxide nanoparticles and application on dye removal

A simple ultrasound-assisted co-precipitation method was developed to prepare ferroferric oxide/graphene oxide magnetic nanoparticles (Fe3O4/GO MNPs). The hysteresis loop of Fe3O4/GO MNPs demonstrated that the sample was typical of superparamagnetic material. The samples were characterized by transmission electron microscope, and it is found that the particles are of small size. The Fe3O4/GO MNPs were further used as an adsorbent to remove Rhodamine B. The effects of initial pH of the solution, the dosage of adsorbent, temperature, contact time and the presence of interfering dyes on adsorption performance were investigated as well. The adsorption equilibrium and kinetics data were fitted well with the Freundlich isotherm and the pseudo-second-order kinetic model respectively. The adsorption process followed intra-particle diffusion model with more than one process affecting the adsorption of Rhodamine B. And the adsorption process was endothermic in nature. Furthermore, the magnetic composite with a high adsorption capacity of Rhodamine B could be effectively and simply separated using an external magnetic field. And the used particles could be regenerated and recycled easily. The magnetic composite could find potential applications for the removal of dye pollutants.

Magnetic Fe3O4 nanoparticles were successfully deposited on graphene oxide (GO) sheets through co-precipitation method with the assistance of ultrasound irradiation for the first time and Fe3O4/GO magnetic nanoparticles were used as adsorbent materials. The adsorption properties of the nanocomposite toward Rhodamine B as a cationic dye in aqueous solution were investigated. Adsorption equilibrium and kinetics data were fitted well with the Freundlich isotherm and the pseudo-second-order kinetic model. The magnetic composite could be effectively and simply separated by using an external magnetic field, and then regenerated and recycled for further use.Figure optionsDownload as PowerPoint slide