Preparation and Photocatalytic Properties of Pr-doped Bi2MoO6/TiO2 Composite Nanofibers Under Visible Light Irradiation†

doi:10.7503/cjcu20170097

Abstract

Abstract:

Praseodymium-doped Bi₂MoO₆/TiO₂ composite nonafibers were prepared via solvothermal growth of Bi₂MoO₆ nanostructures on the substance of the electrospun anatase TiO₂ nanofibers. The phase composition, morphology, microstructure and optical properties of the samples were characterized by X-ray diffraction scanning electron microscopy, energy dispersive X-ray spectroscopy, high-resolution transmission electron microscopy, UV-Vis diffuse reflectance spectroscopy and photoluminescence spectroscopy. The photocatalytic activity of the samples were evaluated by photodegradation of methyl orange solution under visible light. The results showed that the Pr³⁺ was incorporated into the Bi₂MoO₆ crystal lattice to form the donor level, which facilitated the activation of the photocatalyst by visible light, retarded the recombination of photo-induced electrons-holes, and inhibited the leaching of dopants, leading to an enhanced activity and good recycling stability. The 3%(molar faction) Pr-doped Bi₂MoO₆/TiO₂ photocatalyst exhibited the best activity, with a MO degradation rate of 93.8% after visible light irradiation for 180 min. The Pr-doped Bi₂MoO₆/TiO₂ composite nanofibers exhibited superior photocatalytic activity compared to the Bi₂MoO₆/TiO₂composite nanofibers.

Key words: Electrospinning technique, Praseodymium-doping, Bi₂MoO₆/TiO₂, Visible light photcatalysis activity

CLC Number:

O643

TrendMD:

LI Yuejun, CAO Tieping, MEI Zemin, XI Xiaotian, WANG Xia. Preparation and Photocatalytic Properties of Pr-doped Bi₂MoO₆/TiO₂Composite Nanofibers Under Visible Light Irradiation^†[J]. Chem. J. Chinese Universities, 2017, 38(12): 2313.

Figures/Tables 10

Fig.1 XRD patterns of different samples a. TiO2; b. BM-TO; c. 1PBM-TO; d. 2PBM-TO;e. 3PBM-TO; f. 4PBM-TO.

Fig.2 SEM images of TiO2(A), BM-TO(B), 1PBM-TO(C), 2PBM-TO(D),3PBM-TO(E) and 4PBM-TO(F)

Fig.3 EDS spectra of 1PBM-TO(A), 2PBM-TO(B), 3PBM-TO(C) and 4PBM-TO(D)

Fig.4 TEM(A), HRTEM(B)and SAED(C) images of BM-TO composite nanofibers

Fig.5 UV-Vis DRS spectra(A) and corresponding Tauc’s plots(B) of different samples

Fig.6 Photoluminescence spectra of different samples

Fig.7 Photocurrents of different samples

Scheme 1 Schematic diagram of the energy band structure and electron-hole pair separation in the Pr-doped Bi2MoO6/TiO2

Fig.8 Photodecomposition curves(A) and relationship between irradiation time and ln(c0/c)(B) of different samples

Fig.9 Degradation curves of 3PBM-TO composite nanofibers for reusing 5 cycles

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Preparation and Photocatalytic Properties of Pr-doped Bi₂MoO₆/TiO₂Composite Nanofibers Under Visible Light Irradiation^†

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