Synthesis and Photocatalytic Activity of Z-Scheme Photocatalyst Sb2WO6/g-C3N4 †

doi:10.7503/cjcu20180498

Abstract

Abstract:

Sb₂WO₆ modified g-C₃N₄(Sb₂WO₆/g-C₃N₄) composites were synthesized by hydrothermal reaction. The properties of the Sb₂WO₆/g-C₃N₄ composites were analyzed by X-ray diffraction(XRD), scanning electron microscopy(SEM), UV-Vis diffuse reflectance spectroscopy(UV-Vis DRS) and photoluminescence(PL) spectroscopy. The results indicated that the Sb₂WO₆ grew on the surface of g-C₃N₄, forming closely contacted interfaces between the Sb₂WO₆ and g-C₃N₄ components. The photocatalytic performance of Sb₂WO₆/g-C₃N₄ composites was evaluated through the photodegradation of Rhodamine B(RhB). The results showed that 99.3% of RhB was degraded by Sb₂WO₆/g-C₃N₄ composites with 10%(mass fraction) of Sb₂WO₆ in 60 min under simulated sunlight, which was much higher than that of pure g-C₃N₄ and Sb₂WO₆. This highly enhanced photocatalytic activity of the Sb₂WO₆/g-C₃N₄ composites can be mainly attributed to strong interfacial interaction promoting the photo-generated electron-hole separation and migration. The results of radical scavenger experiments showed that · $O 2 -$ and h⁺ were the dominant reactive species in the photocatalytic reaction. Besides, the Sb₂WO₆/g-C₃N₄ composites showed excellent stability over several reaction cycles. Finally, a possible Z-scheme photocatalytic mechanism was proposed based on the experimental results.

Key words: Sb₂WO₆/g-C₃N₄, Z-Scheme photocatalyst, Photocatalytic activity

CLC Number:

O643.3

TrendMD:

ZHANG Jing,DONG Yuming,LIU Xiang,LI Hexing. Synthesis and Photocatalytic Activity of Z-Scheme Photocatalyst Sb₂WO₆/g-C₃N₄ ^†[J]. Chem. J. Chinese Universities, 2019, 40(1): 123.

Figures/Tables 9

Fig.1 XRD patterns of g-C3N4, Sb2WO6 and SCN-5, SCN-10, SCN-15, SCN-25 composites

Fig.2 SEM images of g-C3N4(A), Sb2WO6(B) and SCN-10(C) composites

Fig.3 N2 adsorption-desorption isotherms(A) and dV/dD(B) of g-C3N4, Sb2WO6 and SCN-10 composites

Fig.4 UV-Vis spectra(A) and band gap energy(B) of g-C3N4, Sb2WO6 and SCN-10 composites

Fig.5 PL spectra of g-C3N4, Sb2WO6 and SCN-5, SCN-10, SCN-15, SCN-25 composites

Fig.6 Photodegradation curves(A) and pseudo-first-order kinetics curves(B) of the degradation of RhB by different photocatalysts

Fig.7 Cycle runs of SCN-10 for degradation of RhB

Fig.8 Effects of scavengers on the photo-degradation efficiency of RhB over SCN-10 composites

Scheme 1 Schematic of a proposed Z-scheme photocatalytic mechanism of SCN composites

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Synthesis and Photocatalytic Activity of Z-Scheme Photocatalyst Sb₂WO₆/g-C₃N₄ ^†

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