Adsorption of Mn, Zn, Co, Ba and Ra from
solutions in the range 10-5-10-10
mol-1 was measured in varying degrees of detail on α-alumina.
It was found that (i) below a limiting concentration
of about 1 × 10-1 moll-1, the logarithmic adsorption
isotherm was linear whereas, above this limit, the logarithmic adsorption
isotherm was curvilinear for Ba, Ra, Mn, and Co but linear for Zn with a slope of 0.51 ; (ii)
below this limiting concentration, the pH at 50% adsorption was independent of
solution concentration; and (iii) this limiting concentration was independent
of the adsorbing metals studied. An adsorption model for the
concentration-independent regime was developed based on adsorption at high
energy, negatively charged adsorption sites by M(OH)n+ ions without
accompanying proton release from either the surface or the adsorber.
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