Li(I), Cu(II), Zn(II) and Mn(II) Adsorption by Montmorillonite(Thai)

Abstract

Homoionics, Li(I), Cu(II), Zn(II) and Mn(II), were adsorbed in the interlayer spaces of montmorillonite by conventional cation exchange reactions between the aqueous solution of Li(I), Cu(II), Zn(II) and Mn(II) chloride and montmorillonite at room temperature. The metal-adsorbed montmorillonites were characterized by powder X-ray diffraction, infrared spectroscopy and thermal analyses. The basal spacings were 1.46, 1.25, 1.52 and 1.61 nm for Li(I), Cu(II), Zn(II) and Mn(II) treated montmorillonites, respectively. The weight losses at the temperature ranges of 200-700°C, 200-650°C, 300-700°C and 200-650°C for Li(I)-, Cu(II)-, Zn(II)- and Mn(II)-montmorillonites, respectively, corresponding to the endothermic peaks in the DTA curves, were ascribed to the dehydration of coordinated water molecules, metal evolution and dehydroxylation of montmorillonite.