An Imprinted Organic−Inorganic Hybrid Sorbent for Selective Separation of Cadmium from Aqueous Solution
- 11 December 2003
- journal article
- Published by American Chemical Society (ACS) in Analytical Chemistry
- Vol. 76 (2), 453-457
- https://doi.org/10.1021/ac0347718
Abstract
A hierarchical double-imprinting concept was applied to the preparation of a new organic−inorganic hybrid sorbent for selective separation of Cd(II) from aqueous solution. In the prepared hierarchically imprinted sorbent, both Cd(II) and surfactant micelles (cetyltrimethylammonium bromide) were used as templates. The sorbent was prepared through self-hydrolysis, self-condensation, and co-condensation of the cross-linking agent (tetraethoxysilicate) and the functional precursor (3-(2-aminoethylamino)-propyltrimethoxysilane) in an alkaline media followed by gelation. The selectivity of the sorbent was investigated by a batch competitive ion-binding experiment using an aqueous Cd(II) and Zn(II) mixture. The largest selectivity coefficient for Cd(II) in the presence of Zn(II) was found to be over 100; the largest relative selectivity coefficient between Cd(II) and Zn(II), over 200. The uptake capacity of the prepared hierarchically imprinted sol−gel sorbent and the selectivity coefficient are much higher than those of the sorbent prepared in the absence of CTAB-template. The sorbent possesses a fast kinetics for the removal of Cd(II) from aqueous solution.Keywords
This publication has 10 references indexed in Scilit:
- Bioimprinting of Polymers and Sol−Gel Phases. Selective Detection of Yeasts with Imprinted PolymersAnalytical Chemistry, 2002
- The application of molecular imprinting technology to solid phase extractionChromatographia, 2001
- Matrix-induced modification of imprinting effect for Cu2+ adsorption in hybrid silica matricesAnalytica Chimica Acta, 2001
- Selective solid-phase extraction of bio- and environmental samples using molecularly imprinted polymersBioseparation, 2001
- Selective surface adsorption versus imprinting in amorphous microporous silicasMicroporous and Mesoporous Materials, 1999
- Strong N−H⋅⋅⋅O Hydrogen Bonding in a Model Compound of the Catalytic Triad in Serine ProteasesAngewandte Chemie-International Edition, 1999
- Template Recognition in Inorganic−Organic Hybrid Films Prepared by the Sol−Gel ProcessChemistry of Materials, 1998
- Molecular and Ionic Recognition with Imprinted PolymersPublished by American Chemical Society (ACS) ,1998
- Comparison of Metal Uptake Properties of Silica Gel-Bound Ion Exchangers and Some Amine DerivativesAnalytical Letters, 1996
- Template-Based Approaches to the Preparation of Amorphous, Nanoporous SilicasChemistry of Materials, 1996