Abstract
Abstract It was confirmed from measurements of the adsorption isotherms of phosphates in aqueous solutions that there were adsorption sites with very high reactivity on the surface of silica–alumina. The concentration of adsorption sites which is estimated from the adsorption amount extrapolated to zero equilibrium concentration is nearly twice the concentration of Lewis-acid sites for silica–alumina of higher alumina content. Furthermore, the concentration of phosphate adsorbed on the surface of various silica–alumina is relatively well correlated with the concentration of Lewis-acid sites.
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