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Magnetic-porous microspheres with synergistic catalytic activity of small-sized gold nanoparticles and titania matrix

  • Kadriye Özlem Hamaloğlu
  • Ebru Sağ
  • Çiğdem Kip
  • Erhan Şenlik
  • Berna Saraçoğlu Kaya
  • Ali TuncelEmail author
Research Article
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Abstract

Fe3O4 nanoparticles immobilized on porous titania in micron-size range were decorated with small-sized gold nanoparticles and used as a plasmonic catalyst for the reduction of 4-nitrophenol. Monodisperse-porous magnetic titania microspheres were synthesized with bimodal pore-size distribution by the sol-gel templating method. Small-sized gold nanoparticles obtained by the Martin method were attached onto the aminated form of the magnetic titania microspheres. A significant enhancement in the catalytic activity was observed using the gold nanoparticle-decorated magnetic titania microspheres compared to gold nanoparticle-decorated magnetic silica microspheres because of the synergistic effect between small-sized gold nanoparticles and titania. The synergistic effect for gold nanoparticle-attached magnetic titania microspheres could be explained by surface plasmon resonance-induced transfer of hot electrons from gold nanoparticles to the conduction band of titania. Using the proposed catalyst, 4-nitrophenol could be converted to 4-aminophenol in an aqueous solution within 0.5 min. The 4-nitrophenol reduction rates were 2.5–79.3 times higher than those obtained with similar plasmonic catalysts. The selection of micron-size, magnetic, and porous titania microspheres as a support material for the immobilization of small-sized gold nanoparticles provided a recoverable plasmonic catalyst with high reduction ability.

Keywords

small-sized gold nanoparticles magnetic titania microspheres sol-gel template synthesis plasmonic catalysis 4-nitrophenol 

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Notes

Acknowledgements

Special thanks are extended to the Turkish Academy of Sciences (TUBA) for research support provided to Prof. Ali Tuncel as a full member.

Supplementary material

11705_2019_1799_MOESM1_ESM.pdf (608 kb)
Magnetic-porous microspheres with synergistic catalytic activity of small-sized gold nanoparticles and titania matrix

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Copyright information

© Higher Education Press and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Kadriye Özlem Hamaloğlu
    • 1
  • Ebru Sağ
    • 2
  • Çiğdem Kip
    • 1
  • Erhan Şenlik
    • 1
  • Berna Saraçoğlu Kaya
    • 2
  • Ali Tuncel
    • 1
    Email author
  1. 1.Chemical Engineering DepartmentHacettepe UniversityAnkaraTurkey
  2. 2.Chemical Engineering DepartmentCumhuriyet UniversitySivasTurkey

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