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Journal of Sol-Gel Science and Technology
Erschienen in: Journal of Sol-Gel Science and Technology 3/2013

01.06.2013 | Original Paper

Sol–gel derived ion imprinted thiocyanato-functionalized silica gel as selective adsorbent of cadmium(II)

verfasst von: Jin-Bao Wu, Shu-Yan Zang, Yan-Li Yi

Erschienen in: Journal of Sol-Gel Science and Technology | Ausgabe 3/2013

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Abstract

A Cd(II)-imprinted thiocyanato-functionalized silica gel adsorbent with high adsorption capacity was prepared by surface imprinting technique combined with sol–gel process for the selective adsorption of Cd(II) ion in aqueous solution, and was characterized by Fourier-transform infrared spectroscopy, nitrogen gas sorption and thermogravimetric analysis. The influences of different conditions (such as the pH of solutions, the contact time and the initial concentrations of Cd(II) ions) on the adsorption capacity of Cd(II) were investigated. The optimum pH of adsorption was in the range of 4–8.5. The adsorption equilibrium could be reached in 20 min. The relatively selectivity coefficients of the imprinted silica were higher than those of the non-imprinted adsorbents. Ho’s pseudo-second-order model well described the kinetics of the adsorption reaction. The adsorption process of metals followed Redlich–Peterson isotherm model, and the experimental value of maximum adsorption capacity for Cd(II) was 72.8 mg·g−1. The positive value of ΔH o suggested endothermic nature of Cd(II) adsorption on the imprinted silica adsorbent. Increase in entropy of adsorption reaction was shown by the positive value of ΔS o and the negative value of ΔG o indicating that the adsorption was spontaneous in nature.
Vorheriger Artikel Polarization-controlled leakage current and photovoltaic effect in highly preferentially oriented BiFeO3 film
Nächster Artikel Band edge emission of ZnS nanoparticles prepared by excess of thiourea as a source of sulfur

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Metadaten
Titel
Sol–gel derived ion imprinted thiocyanato-functionalized silica gel as selective adsorbent of cadmium(II)
verfasst von
Jin-Bao Wu
Shu-Yan Zang
Yan-Li Yi
Publikationsdatum
01.06.2013
Verlag
Springer US
Erschienen in
Journal of Sol-Gel Science and Technology / Ausgabe 3/2013
Print ISSN: 0928-0707
Elektronische ISSN: 1573-4846
DOI
https://doi.org/10.1007/s10971-013-3029-2

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