METAL-ION COMPLEXATION OF HYDROPHILIC POLYMERIC AMINO LIGANDS DERIVEDFROM TETRAETHYLENEGLYCOL DIACRYLATE (TTEGDA)-CROSS-LINKED POLYACRYLAMIDES

Complexation behaviour of amino ligands supported on polyacrylamides w ith 2-20mol% of tetraethyleneglycol diacrylate crosslinks was investig ated towards Co(II), Ni(II), Cu(II), Zn(II) and Hg(II) ions. The metal ion intake was dependent on the extent of crosslinking and followed t he order: Hg(II) > Cu(II) > Zn(II) > Ni(II) > Co(II). The aminopolyacr ylamides and their metal complexes were characterised by IR and EPR te chniques. The absorptions of the ligands were shifted by complexation with metal ions and the EPR spectrum suggested distorted tetragonal ge ometry for the Cu(II) complex. The thermogravimetric analysis of the m etal complexes revealed a pattern of variation of thermal stability on incorporation of metal ions. The kinetics and adsorption parameters o f complexation, swelling characteristics, recyclability and specificit y of metal-desorbed systems are also described.