Possible usage of carbamide tar for creating artificial grounds with high sorption capacity

Abstract

Filtering a lead solution through model samples prepared on the basis of alluvial sand mixed with carbamide tar at the ratio of 1: 1 and 1: 2 resulted in a sorption capacity of 30 and 160 mg/g of sample, respectively. Direct and reverse potentiometric titration of carbamide tar with a 0.1 N Pb (NO3)2 solution showed that these results are due to the fact that the curing of carbamide tar in acidic conditions is accompanied by irreversible lead sorption, which is not extracted by conventional buffer solutions. Thus, lead atoms become tightly integrated in the polymer structure of the tar with N-Pb-N bonding.