Abstract: A couple of new benzimidazole chelating resins, bisbenzimidazole supported on phenol-formaldehyde(PTBMZs), were synthesized by phenolformaldehyde condensation of tetrabenzimidazole ligand. The PTBMZs have a 2.06~3.02 mmol of ligand content per gram of the resin. Their structures were characterized by solid-state 13C crossing-polarization and magic-angle spinning（CP MAS） NMR, FT-IR spectroscopy. Batch adsorption capacities were determined for the chloride of some divalent metal cations in buffer solutions in the pH rang of 1.0 to 6.0. The adsorption capacities of the PTBMZ-1 under non-competitive condition are 1.15 mmol/g for Cu2+ at pH=5 and the ligand occupations are 35.7%. Elemental analysis and electron paramagnetic resonance(EPR) studies suggested that complexes with the metal cation to ligand ratio of mainly 1∶2 were formed on the BBEAH modified resins via tridentate chalete structure.

Key words: Chelating resin, Matrix of Bakelite-type, 1,3-bis(benzimidazol-2yl)propylamine, Metal adsorption.