Influence of the adsorbed metal cations on the aging of aluminum (III), chromium (III) and zirconium (IV) oxyhydroxides

The aging of the freshly precipitated oxyhydroxides of Al (III), Cr (III) and Zr (IV) with the adsorbed cations of non-ferrous metals (Cu 2+, Ni 2+, Cr 3+, Pb 2+ and Cd 2+) in long-term (2-3 years) exposure to 0,25 M NaCl solution at room temperature has been studied. It has been established that among the studied oxyhydroxides only alumina gel’s electric surface properties and composition have been changed significantly. Over 70 % of the non-ferrous metal cations are desorbed in the result of such transformations. The chromogels and zirconia gels has changed only slightly over the same period of time. The nature of the adsorbed cations insignificantly affects the properties of studied oxyhydroxides.