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Frontiers of Chemical Science and Engineering

ISSN 2095-0179

ISSN 2095-0187(Online)

CN 11-5981/TQ

Postal Subscription Code 80-969

2018 Impact Factor: 2.809

Front. Chem. Sci. Eng.    2019, Vol. 13 Issue (3) : 574-585    https://doi.org/10.1007/s11705-019-1799-y
RESEARCH ARTICLE
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.

Keywords small-sized gold nanoparticles      magnetic titania microspheres      sol-gel template synthesis      plasmonic catalysis      4-nitrophenol     
Corresponding Author(s): Ali Tuncel   
Online First Date: 16 April 2019    Issue Date: 22 August 2019
 Cite this article:   
Kadriye Özlem Hamaloğlu,Ebru Sağ,Çiğdem Kip, et al. Magnetic-porous microspheres with synergistic catalytic activity of small-sized gold nanoparticles and titania matrix[J]. Front. Chem. Sci. Eng., 2019, 13(3): 574-585.
 URL:  
https://academic.hep.com.cn/fcse/EN/10.1007/s11705-019-1799-y
https://academic.hep.com.cn/fcse/EN/Y2019/V13/I3/574
Fig.1  Synthesis of monodisperse porous (a) Mag-TiO2 and(b) Mag-SiO2 microspheres by a staged-shape template hydrolysis and condensation protocol
Fig.2  (a) SEM photographs of MAuNP@Mag-TiO2 microspheres, (b) SEM photographs of MAuNP@Mag-SiO2 microspheres. Magnification: 20000X and 200000X, Magnification in the SEM photos showing size distribution: 2000X, (c) EDX spectrum of MAuNP@Mag-TiO2 microspheres, (d) EDX spectrum of MAuNP@Mag-SiO2 microspheres
Fig.3  XRD patterns of (a) MAuNP@Mag-SiO2 and (b) MAuNP@Mag-TiO2 microspheres
Fig.4  UV-Vis spectra at different times during the plasmonic reduction of 4-NP with TAuNP@Mag-TiO2 microspheres. Inset: Variation of 4-NP and 4-AP concentrations with the time. Calcination temperature: 450°C, AuNP loading: 5% w/w; catalyst amount: 1 mg, 4-NP concentration: 7.5 mg?L?1, 26.5 mL, temperature: 20°C
Fig.5  Variation of 4-NP concentration with time using TAuNP@Mag-TiO2, MAuNP@Mag-TiO2, and MAuNP@Mag-SiO2 microspheres as plasmonic catalysts and reference materials (i.e., TiO2, Mag-TiO2, and Mag-SiO2). Calcination temperature: 450°C; AuNP loading: 5% w/w; catalyst amount: 1 mg; 4-NP concentration: 7.5 mg?L?1, 26.5 mL; temperature: 20°C
Fig.6  Effect of the initial 4-NP concentration on the plasmonic reduction rate of 4-NP with (a) TAuNP@Mag-TiO2 and (b) MAuNP@Mag-TiO2 microspheres. Calcination temperature: 450°C; AuNP loading: 5% w/w; catalyst amount: 1 mg; temperature: 20°C
Catalyst type 4-NP Initial concentration /(mg?L?1) kapp /(min?1·mgcatalyst?1)
TAuNP@Mag-TiO2 microspheres 5.0 0.353
7.5 0.133
15.0 0.024
MAuNP@Mag-TiO2 microspheres 5.0 5.852
7.5 2.589
15.0 2.927
Tab.1  First-order apparent rate constants for 4-NP reduction by AuNP@Mag-TiO2 microspheres as plasmonic catalyst for different initial concentrations of 4-NP a)
Fig.7  Effect of AuNP loading on the reduction rate of 4-NP with MAuNP@Mag-TiO2 microspheres. Calcination temperature: 450°C; catalyst amount: 1 mg; 4-NP concentration: 7.5 mg?L?1, 26.5 mL; Temperature: 20°C
Fig.8  Effect of catalyst amount on the plasmonic reduction rate of 4-NP with MAuNP@Mag-TiO2 microspheres. Calcination temperature: 450°C, AuNP loading: 5% w/w; 4-NP concentration: 7.5 mg?L?1, 26.5 mL, temperature: 20°C
MAuNP@Mag-TiO2 concentration /(mg?mL?1) kapp /min?1 kapp /(min?1·mgcatalyst?1)
0.019 (0.5)b) 1.834 3.668
0.038 (1.0)b) 2.589 2.589
0.076 (2.0)b) 9.492 4.746
0.152 (4.0)b) 14.532 3.633
Tab.2  First-order apparent rate constants for 4-NP reduction for different MAuNP@Mag-TiO2 concentrationsa)
Fig.9  Possible mechanisms for 4-NP reduction with (a) MAuNP@Mag-TiO2 and (b) MAuNP@Mag-SiO2 microspheres
Fig.10  Reusability of MAuNP@Mag-TiO2 microspheres for plasmonic reduction of 4-NP. Calcination temperature: 450°C; AuNP loading: 5% w/w; catalyst amount: 1 mg; 4-NP concentration: 7.5 mg?L?1, 26.5 mL; temperature: 20°C.
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