Complexing properties of polyhexamethyleneguanidine chemically grafted to a silica surface

Abstract

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.

Determination of Metals in Natural Waters by Inductively Coupled Plasma Optical Emission Spectroscopy after Preconcentration on Silica Sequentially Coated with Layers of Polyhexamethylene Guanidinium and Sulphonated Nitrosonaphthols

“…The adsorbents remain colored red, which is characteristic for [CoL 3 ] 6- complexes (where L is NRS or NNS), even in strongly acidic media. In this case, the Co concentration can be determined by a sorption-photometric method directly in the phase of the adsorbent using diffuse reflectance spectroscopy as described in [31].…”

“…The aim of the present work is connected with preparation of three new silica based adsorbents by consecutive treatment of the surface with PHMG and sulphonated nitrosonaphthols and investigation of their adsorption properties towards a group of transition metals cations with focus on the development of ICP-OES method of natural waters analysis. The presence of oppositely charged layers at the surface of adsorbents and chelating properties of residual guanidinium groups in PHMG can influence both selectivity and kinetics of metals adsorption as indicated in the literature [30, 31].…”

In Situ Immobilization on the Silica Gel Surface and Adsorption Capacity of Poly[N-(4-carboxyphenyl)methacrylamide] on Toxic Metal Ions

“…Binding capable of complexing polymers on the surface of silica and other inorganic oxide matrices can be made by adsorption of polymers [ 8 ] and formation of chemical bonds with surface sites [ 1 , 9 ].…”