Removal and enrichment of copper ions from aqueous solution by 1,8-diaminonapthalene polymer

Microparticles of poly(1,8-diaminonapthalene) (PDAN) were prepared by chemically oxidative polymerization by (NH4)2S2O8. The effect of pH on the sorption of Cd(II), Cu(II), Ni(II), Mn(II), Zn(II) and Pb(II) on PDAN was examined by the batch procedure. PDAN showed good sorption capacity and high selectivity towards Cu(II) in comparison with the very popular chelating sorbent Chelex 100 containing iminodiacetic functional groups. The on-line preconcentration system containing the knotted reactor with the obtained polymer was examined for the sorption and desorption processes of copper ions. The applicability of this system was checked by analysis of Cu(II) content in standard reference material (NIST 1643e) and some natural water samples.