Selective adsorption of lead ion on calix[4]arene carboxylate resin supported by polyallylamine

A calix[4]arene carboxylate resin was prepared by calix[ 4]arene carboxylat e on polymer matrices of polyallylamine to investigate the resin's adsorpti on behavior for some metal ions including lead ion. The selectivity sequenc e among the base metal ions on the resin is as follows: Pb > > Cu > > Zn = Ni = Co The origin of the selectivity sequence is attributed not to amino soups of the polymer matrices but to the functional groups of calix[4]arene carboxyl ate introduced. Although maximum loading capacity for lead ion on the resin was not very high, it shows high lead selectivity and the separation of tr ace amount of lead from large excess of zinc was completely achieved.