Abstract

• Decontamination of pentavalent arsenic (As5+) ions in aqueous solution by manganese ferrites (MnFe2O4) was presented in this paper. MnFe2O4 were prepared by sonochemical synthesis method and they were used as adsorbents for removal of arsenic. The essential parameters such as pH of the precursor and post annealing temperature based on the formation of spinel manganese ferrite were discussed. The structural properties of manganese ferrites including compound identification, the crystal structure and surface morphology were investigated by Fourier transform infrared (FT-IR), X-ray diffraction (XRD) and Scanning electron microscope (SEM). The adsorption behaviour of As5+ ions on the manganese ferrite has been performed by batch adsorption experiment. The concentration of arsenic adsorbed on manganese ferrite was determined by atomic absorption spectroscopy coupled with hydride vapour generation (HVG-AAS). The adsorption capacity was fitted with the Langmuir isotherm model. The decontamination efficiency and adsorption amount of As determined from Langmuir isotherm model were discussed.