The authors have studied the cation-exchange properties of the adduct of long-flame coal and maleic anhydride in comparison with oxidized coals and commercial adsorbents. It has been shown that its protogenic groups undergo dissociation in a wide range of pK (3.6-6.5). The sorption of cations of polyvalent metals from aqueous solutions depends on the surface properties of the cation-exchanger: the adduct exhibits higher sorption activity with respect to Cr, Fe and Pb than the cation-exchanger KB-4.
展开▼
