TiO2 Nanofibers Embedded with Au and Fe3O4 Nanoparticles for Visible-light Photocatalysis†

doi:10.7503/cjcu20140781

Abstract

Abstract:

TiO₂ nanofibers embedded with Au and Fe₃O₄ nanoparticles, were prepared via a two-step route. Firstly, TiO₂ nanofibers embedded with Fe₃O₄ nanoparticles were synthesized through electrospinning technique. Then the Au nanoparticles were embedded into the nanofibers after sufficient impregnation with HAuCl₄ solution. The structure and morphology of the composite were characterized by X-ray diffraction(XRD), Scan electron microscopy(SEM), transmission electron microscopy(TEM) and UV-Vis diffuse reflection spectra(UV-Vis DRS). The photocatalytic efficiency of the compositc was tested under visible light irradiation using Rhodamine B(RhB) degradation as the model reaction. The UV-Vis spectra reveal that the photo-adsoption ability, especially for visible light, was improved largely after embedding with Au nanoparticles, owing to the increased active surface area and active sites. Therefore, the TiO₂ nanofiber composite exhibited superior photocatalytic efficiency with enhanced degradation efficiency and degradation rate under visible light. Moreover, embedding with Fe₃O₄ nanoparticles endowed the nanofibers with good magnetic property, which allowed overcoming the difficulty of separation and reutilization.

Key words: Electrospinning technique, TiO2 nanofiber composite, Fe3O4 nanoparticles, Au nanoparticles, Visible-light photocatalysis

CLC Number:

O645

TrendMD:

WANG Xiaohui, , LI Xiaotian. TiO₂ Nanofibers Embedded with Au and Fe₃O₄ Nanoparticles for Visible-light Photocatalysis^†[J]. Chem. J. Chinese Universities, 2015, 36(5): 976.

Figures/Tables 5

Fig.1 XRD patterns of Fe3O4 nanoparticles(a), TiO2 nanofibers embedded with Fe3O4 na-noparticles(b), and TiO2 nanofibers embe-dded with Fe3O4 and Au nanoparticles(c)

Fig.2 SEM images(A and inset), TEM image(B) and HRTEM image(C) of TiO2 nanofibers embedded with Au and Fe3O4 nanoparticles

Fig.3 UV-Vis DRS spectra of TiO2 nanofibers embedded with Fe3O4 nanoparticles(a) and TiO2 nanofibers embedded with Fe3O4 and Au nanoparticles(b)

Fig.4 Photocatalytic-degradation of Rhodamine B under visible light in the presence of different catalystsa. No catalyst; b. TiO2 nanofibers embedded with Fe3O4 nanoparticles; c. TiO2 nanofibers embedded with Au and Fe3O4 nanoparticles; d. recovered TiO2 nanofibers embedded with Au and Fe3O4 nanoparticles with external magnetic field.

Fig.5 Magnetic hysteresis loop of TiO2 nanofibers embedded with Au and Fe3O4 nanopanticles and the separation process(inset)

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TiO₂ Nanofibers Embedded with Au and Fe₃O₄ Nanoparticles for Visible-light Photocatalysis^†

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