Desorption of lithium from manganese oxide adsorbent with ammonium peroxodisulfate as an eluent

The desorption properties of lithium ions from the ion-sieve manganese oxide [HMnO(2Mg)] were investigated using (NH4)2S2O8 as an eluent. The effects of temperature, (NH4)2S2O8 concentration, and solid-solution ratio on the Li+ ion desorptivity were examined. More than 97% of the adsorbed Li+ ions could be desorbed by the treatment of the adsorbent with a 0.5-M (NH4)2S2O8 solution at 30degC for 1 h. The adsorbent after the desorption showed the lithium adsorptivity to be nearly equal to that on the original one. (author)