Preparation of Gold Nanoparticles Loaded Hollow Silica Spheres and Their Catalytic Performance†

doi:10.7503/cjcu20160807

Abstract

Abstract:

A natural polymer of Arabic gum was chosen as the reducing and stabilizing agent to synthesize Au nanoparticles. The Arabic gum and Au nanoparticles(AG-Au) hybrid colloids were obtained by dropping the mixture of the Au nanoparticles, Arabic gum molecules and ammonia solution into ethanol. Tetraethyl orthosilicate(TEOS) was added into the system to form a silica layer on the as-prepared AG-Au hybrid colloids. Finally, the Au loaded silica(Au@SiO₂) hollow particles were produced by simply water washing. For the Au@SiO₂ hollow particles characterization, transmission electron microscope(TEM), X-ray diffraction(XRD) and N₂ adsorption-desorption measurement were conducted. The Arabic gum serves as the templating agent during the formation process of the Au@SiO₂ hollow particles, which has been proved by control experiments. The as-prepared Au@SiO₂ hollow particles show good performance and stability in the catalytic reaction of reduction of methylene blue(MB) with NaBH₄.

Key words: Gold nanoparticles, Silica, Hollow sphere, Arabic gum, Catalysis performance(

CLC Number:

TrendMD:

MENG Qingnan, WANG Kai, TANG Yufei, ZHAO Kang, XIANG Siyuan, ZHANG Kai, ZHAO Lang. Preparation of Gold Nanoparticles Loaded Hollow Silica Spheres and Their Catalytic Performance^†[J]. Chem. J. Chinese Universities, 2017, 38(3): 503.

Figures/Tables 11

Scheme 1 Schematic diagram for the synthesis of Au@SiO2 hollow particles

Fig.1 UV-Vis spectrum(A) and TEM image(B) of the Au nanoparticles

Fig.2 FTIR spectra of Arabic gum(a) and Au nanoparticles(b)

Fig.3 TEM image(A) and XRD pattern(B) of Au@SiO2 hollow particles

Fig.4 Nitrogen adsorption/desorption isotherms(A) and corresponding pore size distribution curve(B) of Au@SiO2 hollow particles

Fig.5 DLS(A) and TEM image(B) of Au-Arabic gum colloids

Fig.6 TGA curve of Au@SiO2 hollow particles

Fig.7 TEM imagines of the samples produced with Arabic gum(A) and washed by water(B) before the silica coating

Fig.8 UV-Vis spectra of MB solution in the pre-sence of NaBH4 and Au@SiO2 hollow particles at different time

Fig.9 UV-Vis spectra of MB solution in the pre-sence of NaBH4(a) or Au@SiO2 hollow particles(b) after 2 h

Fig.10 Five cycles of the reduction of MB using Au@SiO2 hollow particles as the catalyst

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