Effects of N and/or S Doping on Structure and Photocatalytic Properties of BiOBr Crystals

doi:10.1007/s40195-015-0220-1

Abstract

Abstract:

The BiOBr crystals doped with N and/or S have been prepared by a facile and rapid solvothermal method using urea and/or thiourea as doped resource. The morphologies and structures of the as-prepared samples were characterized by SEM, TEM, XRD, XPS and PL spectrum. Their electronic structures have been investigated and discussed using first principles based on the density functional theory. The photocatalytic properties of the products can be adjusted by the content and species of dopants.

Key words: Hydrothermal method, Photocatalysis, Microstructure and properties

Guo-Hua Jiang, Xia Li, Zhen Wei, Teng-Teng Jiang, Xiang-Xiang Du, Wen-Xing Chen. Effects of N and/or S Doping on Structure and Photocatalytic Properties of BiOBr Crystals[J]. Acta Metallurgica Sinica (English Letters), 2015, 28(4): 460-466.

Figures/Tables 11

Fig. 1 SEM images of doped BiOBr samples prepared using different urea/thiourea mixtures: a 0 g urea/0 g thiourea, b 0.2 g urea/0 g thiourea, c 0.2 g urea/0.05 g thiourea, d 0 g urea/0.5 g thiourea

Fig. 2 TEM images of doped BiOBr samples prepared using different urea/thiourea mixtures: a 0 g urea/0 g thiourea; b 0.2 g urea/0 g thiourea; c 0.2 g urea/0.05 g thiourea; d 0 g urea/0.5 g thiourea

Fig. 3 N2 adsorption-desorption isotherms and corresponding pore size distribution curves of doped BiOBr samples prepared using different urea/thiourea mixtures: a 0 g urea/0 g thiourea; b 0.2 g urea/0 g thiourea; c 0.2 g urea/0.05 g thiourea; d 0 g urea/0.5 g thiourea

Fig. 4 XRD patterns of doped BiOBr samples prepared using different urea/thiourea mixtures: a 0 g urea/0 g thiourea; b 0.2 g urea/0 g thiourea; c 0.2 g urea/0.05 g thiourea; d 0 g urea/0.5 g thiourea

Fig. 5 The high-resolution XPS spectra of Bi 4f (S 2p) and N 1s of BiOBr samples prepared using different urea/thiourea mixtures: a, d 0 g urea/0 g thiourea; b, e 0.2 g urea/0.05 g thiourea; c, f 0 g urea/0.5 g thiourea

Fig. 6 XPS valence spectra showing the valence bands VB of both pure BiOBr and N and/or S-doped BiOBr

Fig. 7 Band structures of doped BiOBr samples prepared using different urea/thiourea mixtures: a 0 g urea/0 g thiourea; b 0.2 g urea/0 g thiourea; c 0.2 g urea/0.05 g thiourea; d 0 g urea/0.5 g thiourea

Fig. 8 Density of states DOS and partial density of states PDOS for of doped BiOBr samples prepared using different urea/thiourea mixtures: a 0 g urea/0 g thiourea; b 0.2 g urea/0 g thiourea; c 0.2 g urea/0.05 g thiourea; d 0 g urea/0.5 g thiourea

Fig. 9 Schematic illustration of both pure BiOBr and N- and/or S-doped BiOBr are measured by XPS valence spectra

Fig. 10 Photoluminescence PL emission spectra of doped BiOBr samples prepared using different urea/thiourea mixtures: a 0 g urea/0 g thiourea; b 0.2 g urea/0 g thiourea; c 0.2 g urea/0.05 g thiourea; d 0 g urea/0.5 g thiourea

Fig. 11 Photocatalytic degradation of RhB over different photocatalytic materials a cycling runs for the photodegradation of RhB over as-prepared N-, S-codoped BiOBr b

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