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Magnetic-porous microspheres with synergistic catalytic activity of small-sized gold nanoparticles and titania matrix |
Kadriye Özlem Hamaloğlu1, Ebru Sağ2, Çiğdem Kip1, Erhan Şenlik1, Berna Saraçoğlu Kaya2, Ali Tuncel1() |
1. Hacettepe University, Chemical Engineering Department, Ankara, Turkey 2. Cumhuriyet University, Chemical Engineering Department, Sivas, Turkey |
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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.
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Keywords
small-sized gold nanoparticles
magnetic titania microspheres
sol-gel template synthesis
plasmonic catalysis
4-nitrophenol
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Corresponding Author(s):
Ali Tuncel
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Online First Date: 16 April 2019
Issue Date: 22 August 2019
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