Adsorption of copper on amine-functionalized SBA-15 prepared by co-condensation: Equilibrium properties

Adsorption of copper on amine-functionalized SBA-15 prepared by co-condensation: Equilibrium... SBA-15 functionalized with 3-aminopropyltrimethoxy-silane was synthesized by co-condensation and used as adsorbent for Cu 2+ ions in aqueous solution. The adsorption capacity increased dramatically with increasing temperature, initial copper concentration and pH (up to ca. 6.5). Under suitable conditions, the material exhibited high adsorption capacity even at very low copper concentration. Qualitative estimates of the thermodynamic parameters showed that the overall adsorption process is spontaneous (Δ G ° < 0) and endothermic (Δ H ° > 0). The adsorption isotherms of Cu 2+ on propylamine-functionalized SBA-15 silica were best fitted by the Sips and Redlich–Peterson models. Regeneration of the adsorbent was investigated by treatment of the copper-loaded material with aqueous solution of 0.1 M HCl then 0.1 M NaHCO 3 or by 0.1 M EDTA solution. The adsorption uptake after ten cycles was 90% and 60% of the fresh material adsorption capacity for regeneration with EDTA and acid/base treatment, respectively. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Chemical Engineering Journal Elsevier

Adsorption of copper on amine-functionalized SBA-15 prepared by co-condensation: Equilibrium properties

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Abstract

SBA-15 functionalized with 3-aminopropyltrimethoxy-silane was synthesized by co-condensation and used as adsorbent for Cu 2+ ions in aqueous solution. The adsorption capacity increased dramatically with increasing temperature, initial copper concentration and pH (up to ca. 6.5). Under suitable conditions, the material exhibited high adsorption capacity even at very low copper concentration. Qualitative estimates of the thermodynamic parameters showed that the overall adsorption process is spontaneous (Δ G ° < 0) and endothermic (Δ H ° > 0). The adsorption isotherms of Cu 2+ on propylamine-functionalized SBA-15 silica were best fitted by the Sips and Redlich–Peterson models. Regeneration of the adsorbent was investigated by treatment of the copper-loaded material with aqueous solution of 0.1 M HCl then 0.1 M NaHCO 3 or by 0.1 M EDTA solution. The adsorption uptake after ten cycles was 90% and 60% of the fresh material adsorption capacity for regeneration with EDTA and acid/base treatment, respectively.

Journal

Chemical Engineering JournalElsevier

Published: Jan 1, 2011

References

  • Periodic mesoporous silica-based organic–inorganic nanocomposite materials
    Sayari, A.; Hamoudi, S.
  • Functionalized silica for heavy metal ions adsorption
    Bois, L.; Bonhommé, A.; Ribes, A.; Pais, B.; Raffin, G.; Tessier, F.
  • Mesoporous silica functionalized with diethylenetriamine moieties for metal removal and thermodynamics of cation-basic center interactions
    Dey, R.K.; Oliveira, F.J.V.E.; Airoldi, C.
  • Modification of surface and structural properties of ordered mesoporous silicates
    Jaroniec, M.; Kruk, K.; Jaroniec, C.; Sayari, A.
  • Adsorption behaviour of Cu 2+ and Cd 2+ onto natural bentonite
    Karapinar, N.; Donat, R.
  • Calorimetric investigation of metal ion adsorption on 3-glycidoxypropyltrimethylsiloxane + propane-1,3-diamine immobilized on silica gel
    Sales, J.A.A.; Airoldi, C.
  • Thermodynamics data of interaction of copper nitrate with native and modified chrysotile fibers in aqueous solution
    Fonseca, M.G.; Airoldi, C.

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