Synthesis and characterization of Magnetite Nanoparticles by Precipitation Method: Its Application in the removal of Pb (II), Cu (II), Zn (II) and Mn (II) ions from aqueous solution

H.I. Adegoke, F.A. Adekola, A.L. Agbelemoge, T.O. Ajayi
University of Ilorin, NG

Keywords: magnetite, nanoparticles, adsorption isotherm, pseudo-second order

Summary:

Nano-sized crystals of magnetite (Fe3O4) of different morphologies were synthesized by precipitation methods from iron (II) sulphate. The products were characterized by physicochemical and spectroscopic methods such as pH, colour, bulk density, Transmission Electron Microscopy (TEM), Scanning Electron Microscopy (SEM) and Fourier Transform Infra-red spectroscopy (FT-IR). The morphology of the synthesized magnetite showed spherical particles of smaller molecules with sizes ranging from 4.34-9.38 nm. The adsorption of lead (II), Copper (II), Zinc (II) and Manganese (II) ions onto magnetite nanoparticles was investigated by batch experiment. These ions were effectively adsorbed by the nanoparticles and the equilibrium data was described by Langmuir, Freundlich, Temkin and Dubinin Radushkevich adsorption isotherm. The experimental data fitted the Freundlich isotherm best for Pb (II), Temkin and Dubinin Radushkevich for both Zn (II) and Mn (II) ions with correlation coefficient of 0.997, 0.985 and 0.99 respectively. The kinetics study revealed that the adsorption process was a pseudo-second order reaction suggesting that the adsorption process is likely to be chemisorption. This study revealed that magnetite nanoparticle can be used for the treatment of Pb (II), Cu (II), Zn (II) and Mn(II) ions- based effluents.