Synthesis, characterization and applications of immobilized iminodiacetic acid-modified silica

Porous immobilized iminodiacetic acid modified silica of the general formula S—(CH2)3—N(CH2COOH)2, (where S represents [Si—O]n siloxane network) has been prepared by replacement of the iodide in 3-iodopropyl modified silica with diethyliminodiacetate. The immobilized-diethyliminodiacetate ligand sys...

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Bibliographic Details
Published in:Journal of sol-gel science and technology 2003-09, Vol.28 (2), p.255-265
Main Authors: EL-NAHHAL, Issa M, ZAGGOUT, Farid R, NASSAR, Mona A, EL-ASHGAR, Nizam M, MAQUET, Jocelyne, BABONNEAU, Florence, CHEHIMI, Mohamed M
Format: Article
Language:English
Subjects:
Aqueous solutions
Chemistry
Cobalt
Colloidal gels. Colloidal sols
Colloidal state and disperse state
Copper
Ethyl acetate
Exact sciences and technology
Ferric ions
General and physical chemistry
Hydrochloric acid
Iodine
Leaching
Ligands
Manganese ions
Metal ions
Nickel
NMR
Nuclear magnetic resonance
Silicon dioxide
X ray photoelectron spectroscopy
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Summary:Porous immobilized iminodiacetic acid modified silica of the general formula S—(CH2)3—N(CH2COOH)2, (where S represents [Si—O]n siloxane network) has been prepared by replacement of the iodide in 3-iodopropyl modified silica with diethyliminodiacetate. The immobilized-diethyliminodiacetate ligand system (S-DIDA) was then hydrolyzed by hydrochloric acid to produce the immobilized iminodiacetic acid ligand system (S-IDA). The iodo functionalized modified silica (S-I) was prepared by polycondensation of Si(OEt)4 and (MeO)3Si(CH2)3I. The XPS and CP/MAS 13C NMR spectra showed that not all iodine atoms are replaced and that the hydrolysis of ethyl acetate groups are incomplete upon treatment with HCl. The immobilized iminodiacetic acid ligand system exhibits high potential for the uptake of various di- and trivalent metal ions such as (Mn2+, Fe3+, Co2+, Ni2+, Cu2+ and Zn2+). Complexation of the iminodiacetate ligand system for the metal ions at the optimum conditions was found in the order: Cu2+ > Fe3+ > Ni2+ > Co2+ > Mn2+ > Zn2+. Stability studies of the iminodiacetate ligand system showed that a degradation of the siloxane network and leaching of some species occurred upon treatment with strong acid and base aqueous solutions.
ISSN:0928-0707
1573-4846
DOI:10.1023/A:1026093419515