Preparation of Silver Nanoparticle Loaded Mesoporous TiO2 and Its Photocatalytic Property

doi:10.15541/jim20150535

Abstract

Abstract:

A series of Ag-modified mesoporous titania (TiO₂) particles with various silver contents were prepared by photoreduction. The prepared Ag-TiO₂samples were characterized by X-ray diffraction (XRD), transmission electron microscope (TEM), energy dispersive X-ray spectrometry (EDX) and UV-visible diffuse reflectance spectroscopic (DRS) techniques. The visible light photocatalytic property was demonstrated for photodegradation of methylene blue (MB) solution. The results showed that Ag nanoparticles were firmly immobilized on the TiO₂ surface, which improved electron-hole separation by forming the Schottky barrier at the Ag-TiO₂ interface. The diffusion of reflectance UV-Vis spectra were also served as an indication that the Ag-TiO₂ samples displayed higher red shifts in comparison with un-modified TiO₂sample. Under visible light, the optimal photoactivity was obtained for the sample m-TiO₂-Ag- 2.0wt%. The TiO₂-Ag catalyst is likely to be used again for a number of times without any additional treatment.

Key words: silver nanoparticles, mesoporous titania, photodegraduation, photoreduction

CLC Number:

TQ174

WANG Hui-Lei1,2, LIU Xiao-Heng 1. Preparation of Silver Nanoparticle Loaded Mesoporous TiO₂ and Its Photocatalytic Property[J]. Journal of Inorganic Materials, 2016, 31(5): 555-560.

Figures/Tables 6

Fig. 1 XRD patterns of the m-TiO2 and Ag-modified TiO2 catalysts

Fig. 2 TEM micrographs of the prepared samples(a) TiO2-Ag-2.0wt%; (b) TiO2-Ag-24.0wt%; (c) TiO2-Ag-0.25wt%; (d) m-TiO2

Fig. 3 EDX spectra of the sample TiO2-Ag-2.0wt%

Fig. 4 Diffuse re?ectance absorption spectra of mesoporous TiO2 and Ag modiﬁed mesoporous TiO2

Fig. 5 Photocatalytic degradation curves of MB on samples and P25 under visible light

Fig. 6 Schematic illustration of the effect of Ag loadings on catalyst

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Preparation of Silver Nanoparticle Loaded Mesoporous TiO₂ and Its Photocatalytic Property

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