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Covalent bonding of polyhexamethyleneguanidine amides of maleic and o phthalic acids to the aminated silica surface was performed. The complexing properties of the obtained composite adsorbents with respect to Zn(II), Cu(II), Fe(III), Co(II), Pb(II), Ni(II), Mn(II), Mo(VI), and Cr(VI) ions were studied. The Mo(VI) and Cr(VI) reduction was detected on the modified silica surface bearing polyhexamethyle neguanidine amide with o phthalic acid. The formation of different ligand complexes with transition metal cations adsorbed on the synthesized composite surface was studied.

The complexing properties of modified silica with 4-(2-pyridylazo)resorcinol covalently immobilized by the Mannich reaction are studied with respect to heavy metals. This adsorbent can be used for the preconcentration of heavy metal ions due to its satisfactory kinetic characteristics. The structures of the heavy metal complexes with 4-(2-pyridylazo)resorcinol immobilized on the silica gel surface are studied by ESR and diffuse reflectance spectroscopy.

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