Synthesis of n-p Heterojunction BiOBr/CdS Composites with Enhanced Photocatalytic Properties†

doi:10.7503/cjcu20160837

Abstract

Abstract:

CdS/BiOBr composite was prepared by two-step hydrothermal method, and the phase, surface structure and light response were characterized by X-ray diffraction(XRD), scanning electron microscopy(SEM), transmission electron microscopy(TEM), UV-Vis diffuse reflectance spectrometry(UV-Vis DRS). The results show that CdS/BiOBr composite is n-p type heterojunction, which is composed of spherical CdS particles coated on the surface of BiOBr nanoleaflets. This structure broadens the response range to visible light, and effectively suppresses the recombination of photogenerated electron/hole pair. The photocatalytic performance was investigated by degradation of simulated dye wastewater and photocatalytic desulfurization of simulated fuel under visible light illumination. The results show that the pseudo-first order kinetic constants of degradation of methylene blue(MB) on 6%CdS/BiOBr are 9.6 and 5.3 times of CdS and BiOBr, and the pseudo-first order kinetic constants of desulfurization on 6%CdS/BiOBr are 1.9 and 3.2 times that of BiOBr and CdS, respectively. CdS/BiOBr has good photocatalytic stability, and the degradation rate of MB can still reach more than 90% after recycling 5 times.

Key words: CdS/BiOBr composite photocatalyst, Heterojunction, Methylene blue, Desulfurization, Photocatalysis

CLC Number:

O644

TrendMD:

GAO Xiaoming, DAI Yuan, FEI Jiao, ZHANG Yu, FU Feng. Synthesis of n-p Heterojunction BiOBr/CdS Composites with Enhanced Photocatalytic Properties^†[J]. Chem. J. Chinese Universities, 2017, 38(7): 1249.

Figures/Tables 10

Scheme 1 Schematic illustration of the formation mechanism of CdS/BiOBr

Fig.1 XRD patterns of 2%CdS/BiOBr(a), 4%CdS/BiOBr(b), 6%CdS/BiOBr(c) and 8%CdS/BiOBr(d)

Fig.2 X-Ray photoelectron spectra of 6%CdS/BiOBr(A) Bi4f; (B) O1s; (C) Br3d; (D) Cd3d; (E) S2p.

Fig.3 SEM images of CdS(A), BiOBr(B), 6%CdS/BiOBr(C) and TEM image of 6%CdS/BiOBr(D)

Fig.4 EDS spectrum of 6%CdS/BiOBr

Fig.5 UV-Vis spectra of 2%CdS/BiOBr(a), 4%CdS/BiOBr(b), 6%CdS/BiOBr(c) and 8%CdS/BiOBr(d)The inset shows the relation ship between (Ahν)2 and photo energy.

Fig.6 Temporal UV-Vis absorption spectral changes during the photo-degradation of MB in aqueous solution in the presence of 6%CdS/BiOBr(A) and degradation rate of MB without catalyst(a) and in the presence of CdS(b), BiOBr(c) and 6%CdS/BiOBr(d) under visible light illumination(B)

Fig.9 Effect of reuse of 6%CdS/BiOBr on the degradation rate of MB

Fig.10 Effects of different scavengers on the degradation of MB by CdS/BiOBr compositeScavenger: a. blank; b. BQ; c. EDTA; d. IPA.

Fig.11 Photocatalysis degradation process of MB by CdS/BiOBr composite

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