Construction of novel TiO2/Bi4Ti3O12/MoS2 core/shell nanofibers for enhanced visible light photocatalysis

doi:10.1016/j.jmst.2019.06.020

Abstract

Abstract:

TiO₂/Bi₄Ti₃O₁₂ hybrids have been widely prepared as promising photocatalysts for decomposing organic contaminations. However, the insufficient visible light absorption and low charge separation efficiency lead to their poor photocatalytic activity. Herein, a robust methodology to construct novel TiO₂/Bi₄Ti₃O₁₂/MoS₂ core/shell structures as visible light photocatalysts is presented. Homogeneous bismuth oxyiodide (BiOI) nanoplates were immobilized on electrospun TiO₂ nanofiber surface by successive ionic layer adsorption and reaction (SILAR) method. TiO₂/Bi₄Ti₃O₁₂ core/shell nanofibers were conveniently prepared by partial conversion of TiO₂ to high crystallized Bi₄Ti₃O₁₂ shells through a solid-state reaction with BiOI nanoplates, which is accompanied with certain transition of TiO₂ from anatase to rutile phase. Afterwards, MoS₂ nanosheets with several layers thick were uniform decorated on the TiO₂/Bi₄Ti₃O₁₂ fiber surface resulting in TiO₂/Bi₄Ti₃O₁₂/MoS₂ structures. Significant enhancement of visible light absorption and photo-generated charge separation of TiO₂/Bi₄Ti₃O₁₂ were achieved by introduction of MoS₂. As a result, the optimized TiO₂/Bi₄Ti₃O₁₂/MoS₂-2 presents 60% improvement for photodegrading RhB after 120 min irradiation under visible light and 3 times higher of apparent reaction rate constant in compared with the TiO₂/Bi₄Ti₃O₁₂. This synthetic method can also be used to establish other photocatalysts simply at low cost, therefore, is suitable for practical applications.

Key words: Electrospinning, Bi₄Ti₃O₁₂, Nanofibers, MoS₂, Visible light photocatalysis

Meng-Jie Chang, Wen-Na Cui, Jun Liu, Kang Wang, Hui-Ling Du, Lei Qiu, Si-Meng Fan, Zhen-Min Luo. Construction of novel TiO₂/Bi₄Ti₃O₁₂/MoS₂ core/shell nanofibers for enhanced visible light photocatalysis[J]. J. Mater. Sci. Technol., 2020, 36: 97-105.

Figures/Tables 11

Fig. 1. Scheme for fabricating TiO2/BTO/MoS2 hybrid nanostructures: electrospinning and calcination to form TiO2 nanofibers (a, b); TiO2/BiOI preparation by SILAR method (c); TiO2/BTO formation by high temperature solid-state reaction (d); MoS2 decoration by hydrothermal method (e).

Fig. 2. XRD patterns of TiO2 nanofibers calcined at 500 °C (a), TiO2/BTO nanofibers obtained at 600 °C (b) and TiO2/BTO/MoS2-2 nanofibers (c); standard XRD patterns of anatase TiO2 (d) and rutile TiO2 (e).

Fig. 3. SEM images of TiO2 nanofibers calcined at 500 °C (a), TiO2/BiOI nanofibers after 30 cycle SILAR process (b), TiO2/BTO nanofibers treated at 600 °C (c), TiO2/BTO/MoS2-1 (d), TiO2/BTO/MoS2-2 (e) and TiO2/BTO/MoS2-3 nanofibers (f).

Fig. 4. EDS pattern (a) and elemental mapping (b-g) of the TiO2/BTO/MoS2-2 fiber.

Fig. 5. TEM and HRTEM images of TiO2 nanofibers calcined at 500 °C (a, b), TiO2/BTO nanofibers treated at 600 °C (c, d) and TiO2/BTO/MoS2-2 nanofibers (e, f).

Fig. 6. UV-vis diffusion reflectance spectra of TiO2/BTO (a) TiO2/BTO/MoS2-1 (b), TiO2/BTO/MoS2-2 (c) and TiO2/BTO/MoS2-3 composite nanofibers (d).

Fig. 7. XPS patterns of TiO2/BTO/MoS2-2: overall XPS (a), high resolution spectrum of Bi 4f (b), Ti 2p (c), O 1s (d) and Mo 3d and S 2s (e).

Fig. 8. UV-vis spectral changes of RhB degraded by the TiO2/BTO (a) and TiO2/BTO/MoS2-2 (b) nanofibers; photodegradation efficiency of RhB in the presence of different catalysts under visible light irradiation (c); RhB curves of ln(Co/C) versus irradiation time for different catalysts (d).

Fig. 9. Repeated photocatalytic degradation of RhB over TiO2/BTO/MoS2-2 fibers.

Fig. 10. Transient photocurrent responses (a) and EIS Nyquist plots (b) of electrodes of TiO2/BTO, TiO2/BTO/MoS2-1, TiO2/BTO/MoS2-2 and TiO2/BTO/MoS2-3 composite nanofibers.

Fig. 11. Photoluminescence spectra of TiO2/BTO, TiO2/BTO/MoS2-1, TiO2/BTO/MoS2-2 and TiO2/BTO/MoS2-3 composite nanofibers.

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Construction of novel TiO₂/Bi₄Ti₃O₁₂/MoS₂ core/shell nanofibers for enhanced visible light photocatalysis

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