Preparation and Photocatalytic Properties of BaTiO3/TiO2 Heterostructured Nanofibers

doi:10.3724/SP.J.1077.2014.13508

Abstract

Abstract:

Heterostructured BaTiO₃/TiO₂compositenanofibers were fabricated by in situ hydrothermal method using TiO₂ nanofibers as both template and reactant. The morphology and structure of BaTiO₃/TiO₂ composite nanofibers were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and high-resolution transmission electron microscope (HRTEM). Photocatalytic activity was tested via rhodamine B and phenol degradation as the model reaction. The results showed that the as-fabricated sample was composed of BaTiO₃ nanoparticles assembling uniformly on the surface of TiO₂ nanofibers to form BaTiO₃/TiO₂ heterostructures. Compared with the pure TiO₂nanofibers, BaTiO₃/TiO₂ composite nanofibers exhibited enhanced photocatalytic activity in the decomposition of rhodamine B under UV illumination. The degradation of both RB and phenol followed first-order reaction kinetics, and the composite showed higher photoactivity than did the pure anatase TiO₂．The composite nanofibers also showed good catalytic stability and the decolorizing efficiency of RB solution remained as high as 96% after 5 times recycle. Moreover, the catalyst was easily separated and removed from the system after reaction and reuse.

Key words: electrospinning technique, hydrothermal synthesis, BaTiO3/TiO2 composite nanofibers, photocatalytic degradation

CLC Number:

O643

LI Yue-Jun, CAO Tie-Ping, MEI Ze-Min. Preparation and Photocatalytic Properties of BaTiO₃/TiO₂ Heterostructured Nanofibers[J]. Journal of Inorganic Materials, 2014, 29(7): 741-746.

Figures/Tables 8

Fig. 1 XRD patterns of TiO2 nanofibers (a) and BaTiO3/TiO2 composite nanofibers (b)

Fig. 2 SEM images of TiO2 nanofibers (a) and BaTiO3/TiO2 composite nanofibers (b)

Fig. 3 TEM , HRTEM and SAED images of BaTiO3/TiO2 composite nanofibers

Fig. 4 UV-Vis absorption spectra of different samples

Fig. 5 Performance and kinetic curves of different catalyst samples for photodegradation of rhodamine B under UV illumination

Fig. 6 Performance and kinetic curves of different catalyst samples for photodegradation of phenol under UV illumination

Fig. 7 Schematic diagram showing the energy band structure of BaTiO3/TiO2 heterstructure

Fig. 8 Degradation curves of BaTiO3/TiO2 composite nanofibers for reusing 5 times

References 21

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Preparation and Photocatalytic Properties of BaTiO₃/TiO₂ Heterostructured Nanofibers

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