Facile Synthesis of Hollow Silica Particles and Fine Tuning Their Structures†

doi:10.7503/cjcu20180433

Abstract

Abstract:

First, by adjusting the dosages of citric acid, resorcinol formaldehyde resin(RF) particles with different sizes were prepared. Then, hollow silica particles(h-SiO₂) with raspberry-like morphologies were synthesized using the RF particles as acid-dissolvable templates. If the citric acid concentration was fixed, smaller h-SiO₂ with smoother surface were produced as more FeCl₃ was added. In addition, the Fe ions also facilitated the removal of the RF templates, leading to formation of the h-SiO₂ with larger surface areas. Along this way, Au nanoparticles loaded h-SiO₂(Au@h-SiO₂) had also been produced, which showed good catalytic performance in MB reduction. Therefore, a facile and flexible method was provided here to construct the h-SiO₂ with different structures, which may find potential applications in many fields.

Key words: Resorcinol-formaldehyde resin, Silica, Hollow particle, Structure control, Template synthesis

CLC Number:

TrendMD:

MENG Qingnan, WANG Kai, TANG Yufei, ZHAO Kang. Facile Synthesis of Hollow Silica Particles and Fine Tuning Their Structures^†[J]. Chem. J. Chinese Universities, 2018, 39(11): 2550.

Figures/Tables 7

Fig.1 SEM images of RF particles prepared with citric acidn(citric acid)/mmol: (A)0.17; (B)0.34; (C) 0.51.

Fig.2 TEM images of the silica coated RF particles with different amounts of citric acid(A—C) and the corresponding hollow silica particles(D—F)n(citric acid)/mmol: (A, D) 0.17; (B, E) 0.34; (C, F) 0.51. Inset: a broken particle can be clearly seen.

Fig.3 TEM images of h-SiO2-0.34-0.1(A), h-SiO2-0.34-0.5(B) and h-SiO2-0.34-1.0(C)

Fig.4 FTIR spectra(A), TGA curves(B) and photographs of h-SiO2-0.34-1.0(a, C) and h-SiO2-0.34(b, D)

Fig.5 N2 adsorption-desorption isotherms and the corresponding pore size distribution curves of the h-SiO2-0.34-0.1(A) and h-SiO2-0.34(B), respectively

Fig.6 TEM image(A) and UV-Vis spectrum(B) of the Au nanoparticles

Fig.7 TEM image of Au@h-SiO2(A) and catalytic performance of Au@h-SiO2 for MB decoloration(B)

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