Abstract
Selective metal ions' extraction and recovery has various applications in the analytical field. Metal ions need to be extracted, detected, and quantified. For that purpose, ion-imprinted polymers have earned a great deal of attention during the past two decades. Pd(2+) ion-imprinted hollow silica particles including an isatin Schiff base were prepared by Schiff base condensation of (3-aminopropyl)triethoxysilane and isatin. The prepared Schiff base ligand was coordinated to the target Pd(2+) cations, the polymerizable Pd-complex was set aside to form gel in the company of tetraethoxysilane and the target Pd(2+) cations were subsequently removed from the cross-linked silica network by means of acidified thiourea solution. All materials throughout this synthesis process were investigated utilizing mass spectrometry, elemental analysis, FTIR, and (1)H-NMR. The morphological structure of both Pd(2+) ion-imprinted and non-ion-imprinted silica polymer were pictured by scanning electron microscopy. Several batches were studied exploiting both Pd(2+) ion-imprinted and non-ion-imprinted silica polymer to test their functionality for selective extraction of Pd(2+) cations in multi-ionic solution of Ni(2+), Co(2+), Cu(2+), Mn(2+), and Pd(2+).