Enhanced Photocatalytic Activity of Bi2WO6 by the Synergistic Action of Ti(IV) and Graphene Bi-cocatalysts

doi:10.15541/jim20160345

Abstract

Abstract:

Cocatalyst modification is an effective way to promote the separation of photogenerated electron-hole pairs. The reduced graphene oxide (rGO) with high electron transfer rate and the amorphous Ti(IV) compounds as hole cocatalyst were loaded on the surface of highly-efficient and flake-like Bi₂WO₆ nanoparticles by a hydrothermal-impregnation method to prepare Ti(IV)-rGO/Bi₂WO₆ visible-light-driven photocatalyst. It was found that the Ti(IV) and rGO single-cocatalyst modified Bi₂WO₆ exhibited an enhanced photocatalytic activity and dual-cocatalyst modified Bi₂WO₆ photocatalyst showed higher photocatalytic performance than single-cocatalyst modified Bi₂WO₆. When the amount of Ti(IV) was 5wt%, the photocatalytic rate constant of Ti(IV)-rGO/Bi₂WO₆photocatalyst reached 2.2×10^-2 min^-1, which was 88-fold higher than that of bare Bi₂WO₆. The enhancement of photocatalytic performance mainly depends on the synergistic effect of novel Ti(IV)-hole cocatalyst and rGO-electron cocatalyst, namely, Ti(IV) compounds rapidly transfer the photogenerated holes, while rGO rapidly capture the photogenerated electrons. The present amorphous Ti(IV) and rGO cocatalysts can be widely applied in the design and development of highly efficient cocatalyst-modified photocatalytic materials.

Key words: Bi2WO6, graphene, amorphous Ti(IV) hole-cocatalyst, visible-light photocatalytic activity.

CLC Number:

O643

SONG Jia, XU Ying, MO Yan-Ping, LI Yong-An. Enhanced Photocatalytic Activity of Bi₂WO₆ by the Synergistic Action of Ti(IV) and Graphene Bi-cocatalysts[J]. Journal of Inorganic Materials, 2017, 32(3): 269-274.

Figures/Tables 10

Fig. 1 Schematic diagram illustrating the preparation of various samples(a) Bi2WO6; (b) Ti(IV)/Bi2WO6; (c) rGO/Bi2WO6; (d) Ti(IV)-rGO/ Bi2WO6

Fig. 2 XRD patterns of different samples(a) Bi2WO6; (b) Ti(IV)/Bi2WO6; (c) rGO/Bi2WO6; (d) Ti(IV)-rGO/ Bi2WO6; (e) Ti(IV)

Fig. 3 FESEM images and EDX results (insert) of different samples(a) Bi2WO6; (b) Ti(IV)/Bi2WO6; (c) rGO/Bi2WO6; (d) Ti(IV)-rGO/Bi2WO6

Fig. 4 Raman spectra of (a) Bi2WO6; (b) Ti(IV)/Bi2WO6; (c) rGO/Bi2WO6; (d) Ti(IV)-rGO/Bi2WO6; (e) rGO; (f) GO

Fig. 5 FTIR spectra of various samples(a) Bi2WO6; (b) Ti(IV)/Bi2WO6; (c) rGO/Bi2WO6; (d) Ti(IV)-rGO/Bi2 WO6; (e) rGO; (f) GO

Fig. 6 UV-vis DRS of different samples(a) Bi2WO6; (b) Ti(IV)/Bi2WO6; (c) rGO/Bi2WO6; (d) Ti(IV)-rGO/Bi2 WO6 and Energy band diagram of Bi2WO6(insert)

Fig. 7 Photocatalytic performance of the decomposition of MO by different samples(a) Bi2WO6; (b) Ti(IV)/Bi2WO6; (c) rGO/Bi2WO6; (d) Ti(IV)(1%)- rGO/Bi2WO6; (e) Ti(IV)(3%)-rGO/Bi2WO6; (f) Ti(IV)-rGO/Bi2WO6; (g) Ti(IV)(7%)-rGO/Bi2WO6

Fig. 8 Recycled photocatalytic performance of Ti(IV)-rGO/ Bi2WO6 for the decomposition of MO

Fig. 9 The photocatalytic performance of Ti(IV)-rGO/Bi2 WO6 for the decomposition of MO and phenol and recycled performance for the degradation of phenol(insert)

Fig. 10 Photocatalytic mechanism of (a) rGO/Bi2WO6; (b) Ti(IV)/Bi2WO6; (c) Ti(IV)-rGO/Bi2WO6

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Enhanced Photocatalytic Activity of Bi₂WO₆ by the Synergistic Action of Ti(IV) and Graphene Bi-cocatalysts

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