One-step Synthesis of Flower-like Bi2WO6-rGO Composite Photocatalysts

doi:10.15541/jim20140069

Abstract

Abstract:

A one-step hydrothermal method was developed for fabrication of flower-like Bi₂WO₆-rGO composite photocatalysts with high-efficiency visible-light photocatalytic activity. Photocatalytic experimental results for the decolorization of methyl orange (MO) aqueous solution indicated that all the resulted Bi₂WO₆-rGO photocatalysts exhibited a much higher photocatalytic performance than the pure Bi₂WO₆, and the Bi₂WO₆-rGO (0.5wt%) showed the highest photocatalytic activity with a k = 5.0×10^-2/min, a value as 1.7 times as that of the pure Bi₂WO₆. The enhanced performance can be attributed to the cooperation effect of rGO nanosheet which promoted the effective transfer of photogenerated electrons and provided large surface area for absorbing organic pollutants. This work may provide new insights into design and fabrication of high-performance graphene-based photocatalytic materials.

Key words: Bi2WO6, graphene, Bi2WO6-rGO composite photocatalysts, visible-light photocatalytic activity

CLC Number:

O643

GUO Dan, WANG Ping, ZHENG Qi-Ying, WANG Jin. One-step Synthesis of Flower-like Bi₂WO₆-rGO Composite Photocatalysts[J]. Journal of Inorganic Materials, 2014, 29(11): 1193-1198.

Figures/Tables 10

Fig. 1 Graphical illustration for the synthesis of Bi2WO6-rGO nanocomposite (A) and photographs of various samples(B) (1) GO solution; (2,3) Bi2WO6-GO suspension before (2) and after(3) aging for 5 min; (4,5) Bi2WO6 suspension before (4) and after (5) aging for 5 min; (6,7) Bi2WO6-rGO suspension before (6) and after (7) aging for 5 min

Fig. 2 XRD patterns of different samples (a) GO; (d) rGO; (c) Bi2WO6; (d) Bi2WO6-rGO (0.5wt%)

Fig. 3 FESEM images of different samples (a) GO; (b,c) Bi2WO6; (d,e,f) Bi2WO6-rGO (0.5wt%)

Fig. 4 FTIR spectra of different samples (a) GO; (b) rGO; (c) Bi2WO6; (d) Bi2WO6-rGO (0.5wt%)

Fig. 5 Raman spectra of different samples (a) GO; (b) rGO; (c) Bi2WO6; (d) Bi2WO6-rGO (0.5wt%)

Fig. 6 UV-Vis diffuse re?ectance spectra of different samples (a) Bi2WO6 ; (b) Bi2WO6-rGO(0.5wt%)

Fig. 7 Rate constant (k) of the MO decomposition by various photocatalysts (a) Bi2WO6; (b) Bi2WO6-rGO (0.1wt%); (c) Bi2WO6-rGO (0.5wt%); (d) Bi2WO6-rGO (1wt%); (e) Bi2WO6-rGO(5wt%)

Fig. 8 Cycling performance of Bi2WO6-rGO (0.5wt%) for the degradation of MO

Fig. 9 Schematic diagram for illuminating the photocatalytic mechanism of Bi2WO6-rGO

Fig. 10 Photoluminescence (PL) spectra of different samples (a) Bi2WO6 and ----b) Bi2WO6-rGO (0.5wt%)

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One-step Synthesis of Flower-like Bi₂WO₆-rGO Composite Photocatalysts

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