纳米复合材料Ag@TiO2@SiO2的制备、光催化及其抑菌性能

doi:10.15541/jim20150469

摘要/Abstract

摘要：

以SiO₂为模板, 采用溶胶-凝胶法合成核壳TiO₂@SiO₂复合材料, 用光沉积法在TiO₂@SiO₂表面沉积贵金属Ag合成核壳纳米Ag@TiO₂@SiO₂复合材料。采用透射电镜、X射线衍射、X射线光电子能谱和紫外-可见漫反射光谱进行表征。用罗丹明为目标污染物研究复合材料的光催化性能, 测试对金黄色葡萄球菌和大肠杆菌的抑菌性能。结果表明, 复合材料Ag@TiO₂@SiO₂在紫外光的照射下具有较高的催化性能, 且当含银浓度为0.6 mg/mL时, 复合材料对金黄色葡萄球菌抑菌率为93.41%, 对大肠杆菌的抑菌率为97.37%。Ag@TiO₂@SiO₂具有良好的催化性能和抑菌性能, 有望应用于水处理和医疗器械等领域。

关键词: 复合纳米材料, 银, 催化, 抑菌

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

中图分类号:

O649

石振武, 郭少波, 薛群虎. 纳米复合材料Ag@TiO₂@SiO₂的制备、光催化及其抑菌性能[J]. 无机材料学报, 2016, 31(5): 466-472.

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.

图/表 8

图 1 SiO2 (a)、TiO2@SiO2 (b~c)和Ag@TiO2@SiO2(d~f)样品的透射电镜照片

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

图 2 SiO2 (a)、TiO2@SiO2 (b)和Ag@TiO2@SiO2 (c)样品的XRD图谱

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

图3 Ag@TiO2@SiO2 (a)、Ti2p (b)、Ag3d (c)、Si2p (d)样品的XPS图谱

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

图4 样品TiO2@SiO2和Ag@TiO2@SiO2的紫外-可见漫反射光谱

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

图5 TiO2@SiO2(a)和Ag@TiO2@SiO2(b)对罗丹明光催化降解过程吸光度的变化

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

图6 SiO2、TiO2@SiO2、Ag和Ag@TiO2@SiO2对金黄色葡萄球菌和大肠杆菌的滤纸片扩散照片

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

表1 Ag和Ag@TiO2@SiO2对金黄色葡萄球菌和大肠杆菌的抑菌圈尺寸

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

图7 Ag和Ag@TiO2@SiO2在浓度为0.6 mg/mL时对金黄色葡萄球菌和大肠杆菌的菌落计数法测试结果

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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纳米复合材料Ag@TiO₂@SiO₂的制备、光催化及其抑菌性能

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

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