STUDY ON ADSORPTION CAPACITY OF SOME HEAVY METAL IONS ON NATURAL LATERITE AND NATURAL APATITE ORE

Abstract

This paper focus on Fe(III), Cr(VI), Mn(II), Ni(II) adsorption study results on natural laterite and natural apatite ore. Some characteristics of the materials were investigated by SEM, BET, IR. Some conditions that were effective to the removal of Fe(III), Cr(VI), Mn(II), Ni(II) using the materials such as pH, materials size, contact time and initial concentration of the metal ions were systematically studied. The optimum pH for removal Fe(III), Cr(VI), Mn(II), Ni(II) for both laterite and apatite ore was 2.0, 2.5, 6.0, 6.0, respectively. The materials size was 0,1  0,2 mm. The optimum contact time for removal Fe(III), Cr(VI), Mn(II), Ni(II) was 90 min, 120 min, 150 min and 150 min for laterite while it was 120 min, 150 min, 150 min and 150 min for apatite ore, at room temperature (25 ± 2oC), respectively. Maximum adsorption capacity for Fe(III), Cr(VI), Mn(II), Ni(II) on laterite was 2.72 mg/g; 4.57 mg/g; 1.68 mg/g and 4.34 mg/g while it was 3.02 mg/g; 3.50 mg/g; 2.65mg/g and 5.32 mg/g on apatite ore, respectively.