Organo-montmorillonites . Carbon paste electrodes . Sorption . Metals

Alkylammonium derivatives of montmorillonite were prepared by sorption of hexadecyltrimethylammonium, benzyldimethylhexadecylammonium and hexadecylpyridinium cations. Characterization of the prepared alkylammonium montmorillonites was done by means of X-ray diffraction and infrared spectroscopy. Intercalation as well as ion exchange proces is supposed during the alkylammonium cation sorption into the montmorillonite structure. Sorption properties of all alkylammonium derivatives were studied by means of batch sorption experiments (sorption of Cu, Zn, Pb) as well as by means of voltammetry of Cu(II) on carbon paste electrodes modified with the montmorillonites. Both techniques showed a significant decrease of Cu(II) sorption in the case of montmorillonites modified with the alkylammonium cations