Abstract

• The effective and efficient adsorbent for the removal of pentavalent arsenic (As5+) ions was presented in this paper. Cobalt ferrites, CoFe2O4, adsorbents were prepared by sonochemical synthesis method. The synthesis parameters including pH of the precursor solution and post annealing temperature, based on the formation of spinel cobalt ferrite were discussed. The compound identification, the crystal structure and surface morphology of cobalt ferrite were studied by Fourier transform infrared (FT-IR), X-ray diffraction (XRD) and Scanning electron microscope (SEM) analysis. The adsorption behaviour of As5+ ions on the cobalt ferrite has been investigated by batch adsorption method. The amount ofAs concentration adsorbed on cobalt ferrite is measured by atomic absorption spectroscopy coupled with hydride vapour generation (HVG-AAS).The adsorption capacity was fitted with the Langmuir isotherm model. The removal efficiency and adsorption amount of As determined from Langmuir isotherm model were discussed.