Abstract
A phosphorylated sorbent exhibiting an enhanced selectivity of Cu2+ sorption from aqueous media in the presence of surplus Ca2+ was obtained by carbonization of pine sawdust impregnated with (NH4)3PO4 or a mixture of (NH4)3PO4 and CO(NH2)2. With an increase of Ca2+ concentration to 1 g/dm3, the coefficient of separation using the sorbent phosphorylated in the presence of carbamide increased and reached the level of 19.6 that was three times as much as in the case of sorbent obtained without carbamide. The specific sorption capacity with respect to Cu2+ was higher by ~2 mg/g irrespective of the background concentration of Ca2+ ions; however, this capacity decreased as the content of the latter increased. The field tests of using the obtained sorbent for extraction of Ni2+ and Zn2+ at the stage of tertiary treatment of wastewater from the electroplating production facility before the wastewater discharge were carried out.
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