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Journal of Materials Science

, Volume 44, Issue 24, pp 6795–6804 | Cite as

Cu(II) complexes imobilized on functionalized mesoporous silica as catalysts for biomimetic oxidations

  • M. MureşeanuEmail author
  • V. Pârvulescu
  • R. Ene
  • N. Cioateră
  • T. D. Pasatoiu
  • M. Andruh
Mesostructured Materials

Abstract

Mesoporous HMS silica was synthesized and functionalized with 3-aminopropyl-triethoxysilane (APTES) by a post-synthesis method. HMS and NH2-HMS supports were used for immobilization of two Cu(II) biomimetic complexes ([Cu(acac)(phen)(H2O)](ClO4), [Cu(acac)(Me2bipy)](ClO4)) or laccase enzyme. Mesoporous structure of the support; functionalization of silica surface, structure of ligands, and Cu complexes; and their immobilization were evidenced by XRD analysis, N2 adsorption–desorption, SEM microscopy, TGA-DTA, IR and UV–Vis spectroscopy, and elemental analysis. The results confirm the structural integrity of the mesoporous hosts and successful anchoring of the metal complexes over the supports. For comparison, copper-substituted mesoporous silica (Cu-HMS) by using dodecylamine as structure-directing agent was also synthesized. All the synthesized materials were tested for their catalytic activity on the oxidation of 4-aminoantipyridine, 2,2′-azinobis (3-ethyl-benzothiazoline)-sulfonic acid (ABTS) with air, as well as in liquid phase oxidation of anisole and phenol with hydrogen peroxide. In order to verify the complex biomimetic activity, the Trametes versicolor laccase was immobilized by adsorption in the same supports.

Keywords

Acac Mesoporous Silica Bipy Laccase Activity Immobilize Laccase 

Notes

Acknowledgements

Financial support from the Romanian Education and Research Ministry in the Framework of CeEx project no. 50/2006 is gratefully acknowledged.

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Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  • M. Mureşeanu
    • 1
    Email author
  • V. Pârvulescu
    • 2
  • R. Ene
    • 2
  • N. Cioateră
    • 1
  • T. D. Pasatoiu
    • 3
  • M. Andruh
    • 3
  1. 1.University of CraiovaCraiovaRomania
  2. 2.Institute of Physical ChemistryBucharestRomania
  3. 3.Inorganic Chemistry Laboratory, Faculty of ChemistryUniversity of BucharestBucharestRomania

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