Authors: H.I. Adegoke, F.A. Adekola, O.S. Fatoki, B.J. Ximba
Affilation: University of Ilorin, Nigeria
Pages: 184 - 187
Keywords: sorption, arsenate, nanoparticles, hematite, goethite, magnetite
Hematite (-Fe2O3), magnetite (Fe3O4) and goethite (-FeOOH) nanoparticles were synthesized by transformation of ferrihydrite and precipitation methods, this materials were used for the removal of arsenic (V) ions from aqueous solution. The synthesized nanoparticles were characterized by some physico chemical and spectroscopic methods such as bulk density, point of zero charge(pzc), micropore volume, surface area, x-ray diffraction, x-ray fluorescence, fourier transform infra-red, Scanning and Transformation electron microscopy. The characteristic properties of the iron oxides show that the samples were nanoparticle in size with surface area in the range 45.3 to 56.1m2/g. The x-ray diffraction showed the sample had crystal structures of hematite, goethite and magnetite of 84.3% - 95% respectively. The adsorption experiment results revealed that equilibrium was reached within 120 minutes of the adsorption process and it was pH dependent where optimum pH. Furthermore, batch adsorption isotherm studies were performed to determine the adsorption capacity of As (V) on the nanoparticles. The adsorption data was found to fit the Langmuir, Freundlich, Temkin and Dubinin Radushkevich isotherm. The overall results of this study showed that the synthesized nanostructured hematite, goethite and magnetite are very effective for the removal of As (V) from aqueous solution. These materials offer great potential for environmental technological applications in industries and it is recommended for the decontamination of real industrial effluent.