
%0 Journal Article
%A Lowson, RT 
%A Evans, JV 
%T Adsorption and desorption of heavy metals on &#945;-alumina
%J Australian Journal of Chemistry
%D 1984/11/01
%V 37
%N 11
%P 2165-2178
%K 
%R https://doi.org/10.1071/CH9842165
%U https://www.publish.csiro.au/paper/CH9842165 
%X 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 &#945;-alumina. It was found that (i) below a limiting concentration of about 1 &#215; 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. 
