Preparation, Photocatalytic Property and Antibacterial Property of Ag@TiO2@SiO2 Composite Nanomaterials

doi:10.15541/jim20150469

Abstract

Abstract:

TiO₂@SiO₂ composites with core-shell structure were successfully synthesized using SiO₂as template by Sol-Gel method. Ag nanoparticles (NPs) were photo-deposited on the surface of TiO₂@SiO₂ to form core-shell Ag@TiO₂@SiO₂ composites. The resulting samples were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscope (XPS) and UV-Vis diffuse reflectance spectra (DRS). The photocatalytic activity was evaluated by photocatalytic degradation of rhodamine under UV light, and the antibacterial activity against E. coli and S. aureus was also measured. In comparison to TiO₂@SiO₂, Ag@TiO₂@SiO₂ exhibited higher photocatalytic activity and antibacterial efficiency after loading uniform Ag NPs on the TiO₂. When the concentration of Ag is 0.6 mg/mL, the antibacterial rates against E. coli and S. aureus are 93.41% and 97.37%, respectively. This Ag@TiO₂@SiO₂ may be used in wastewater treatment, medical equipment and other fields due to its excellent photocatalytic activity and antibacterial property.

Key words: composite nanomaterials, Ag, catalytic, inhibition

CLC Number:

O649

SHI Zhen-Wu, GUO Shao-Bo, XUE Qun-Hu. Preparation, Photocatalytic Property and Antibacterial Property of Ag@TiO₂@SiO₂Composite Nanomaterials[J]. Journal of Inorganic Materials, 2016, 31(5): 466-472.

Figures/Tables 8

Fig. 1 TEM images of SiO2 (a), TiO2@SiO2 (b-c) and Ag@TiO2@SiO2 (d-f)

Fig. 2 XRD patterns of SiO2 (a), TiO2@SiO2 (b) and Ag@TiO2@SiO2 (c)

Fig. 3 XPS spectra of Ag@TiO2@ SiO2 (a), Ti2p (b), Ag3d (c), and Si2p (d) samples

Fig. 4 UV-Vis diffuse reflectance spectra of TiO2@SiO2 and Ag@TiO2@SiO2

Fig. 5 Absorbance change during the photocatalytic degradation of phenol using TiO2@SiO2 (a) and Ag@TiO2@SiO2 (b)

Fig. 6 Inhibition zones of the as-synthesized SiO2 spheres, TiO2@SiO2 composites, Ag, and Ag@TiO2@SiO2 composites against S. aureus (a) and E. coli (b)a1,b1: 0.2 mg/mL; a2,b2: 0.4 mg/mL; a3,b3: 0.6 mg/mL; a4,b4: 0. mg/mL

Table 1 Inhibition zone diameters of the Ag and Ag@TiO2@SiO2 against B. subtilis and E. coli.

Concentration /(mg·mL^-1)	B. subtilis -inhibition zones/cm	E．coli-inhibition zones /cm
Concentration /(mg·mL^-1)	Ag Ag@TiO₂@SiO₂	Ag Ag@TiO₂@SiO₂
0.2 0.4 0.6 0.8	0.2 0.1 0.5 0.3 1.1 0.7 1.2 0.8	0.5 0.3 0.7 0.5 1.1 0.8 1.3 1.0

Fig. 7 Spread-plate test results using 0.6 mg/mL of Ag and Ag@TiO2@SiO2 composites against S. aureus (a) and E. coli (b)O: control; A: 0.6 mg/mL commercial Ag; B: 0.6 mg/mL Ag@TiO2@SiO2

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Preparation, Photocatalytic Property and Antibacterial Property of Ag@TiO₂@SiO₂Composite Nanomaterials

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