Preparation and Photocatalytic Efficiency of Fe3O4/TiO2 Nanocomposite Fibers Modified with Ag Nanoparticles†

doi:10.7503/cjcu20130798

Abstract

Abstract:

Fe₃O₄/TiO₂ nanofibers were prepared via electrospinning technique. Then, the samples were modified with Ag nanoparticles by hydrothermal method to obtain the composite fibers with strong magnetism and excellent photocatalytic efficiency. XRD, SEM, TEM and UV-Vis adsorption spectra were used to characterize and analyze the structure and morphology. The photocatalytic efficiency was tested under ultraviolet light irradiation using Rh B degradation as the model reaction. The results showed that TiO₂ in all samples were anatases and Ag nanoparticles were scattered on the magnetic TiO₂ fiber surface averagely. The UV-Vis spectra showed that TiO₂ photoadsoption ability enhanced and the adsorption range were shifted to the visible light region. After modification with Ag nanoparticles, the photocatalytic efficiency of Rh B degradation rate can reach 99.5% under 40 min UV light irradiation. The new material with strong magnetism can be separated easily and cyclically used by adding the magnetic field.

Key words: TiO2 nanofibers, Electrospinning technique, Hydrothermal method, Fe3O4 nanoparticles, Photocatalytic efficiency, Modified with Ag nanoparticles

CLC Number:

O643

TrendMD:

, WANG Xiaohui, LI Xiaotian. Preparation and Photocatalytic Efficiency of Fe₃O₄/TiO₂ Nanocomposite Fibers Modified with Ag Nanoparticles^†[J]. Chem. J. Chinese Universities, 2014, 35(2): 357.

Figures/Tables 6

Fig.1 XRD patterns of Fe3O4 nanoparticles(a), Fe3O4/TiO2 nanofibers(b) and Fe3O4/TiO2 nanofibers modified with Ag nanoparticles(c)

Fig.2 SEM images of Fe3O4/TiO2 nanofibers before(A) and after(B) modiying with Ag nanoparticles

Fig.3 TEM images of Fe3O4 with SiO2(A), and Fe3O4/TiO2 nanofibers after modifying with Ag nanoparticles(B)

Fig.4 UV-Vis spectra of Fe3O4/TiO2 nanofibers before(a) and after(b) modifying with Ag nanoparticles

Fig.5 Photocatalytic properties of Fe3O4/TiO2 nanofibers(a) and Fe3O4/TiO2 nanofibers modified with Ag nanoparticles(b)Inset: UV-Vis spectra of Fe3O4/TiO2 nanofibers modified with Ag nanoparticles at different reaction time. Time/min: a. 0; b. 10; c. 20; d. 30; e. 40; f. 50.

Fig.6 Magnetic hysteresis loop of Fe3O4/TiO2 nanofibers modified with Ag nanopanticles and its separation process(inset)

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Preparation and Photocatalytic Efficiency of Fe₃O₄/TiO₂ Nanocomposite Fibers Modified with Ag Nanoparticles^†

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