BiPO{sub 4}/BiOBr p–n junction photocatalysts: One-pot synthesis and dramatic visible light photocatalytic activity

Highlights: • BiPO{sub 4}/BiOBr p–n junction photocatalysts were synthesized by a solvothermal method. • BiPO{sub 4}/BiOBr composites were constructed by inlaying BiPO{sub 4} particles into BiOBr microspheres. • BiPO{sub 4}/BiOBr photocatalysts exhibited the enhanced photocatalytic activity. • ·O{su...

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Bibliographic Details
Published in:Materials research bulletin 2015-03, Vol.63
Main Authors: Liu, Zhang Sheng, Wu, Bian Tao, Niu, Ji Nan, Feng, Pei Zhong, Zhu, Ya Bo
Format: Article
Language:English
Subjects:
BISMUTH PHOSPHATES
BROMINE OXIDES
COMPARATIVE EVALUATIONS
COMPOSITE MATERIALS
ELECTRONS
HOLES
MATERIALS SCIENCE
MICROSPHERES
NANOPARTICLES
PHOTOCATALYSIS
SCANNING ELECTRON MICROSCOPY
SEMICONDUCTOR JUNCTIONS
SYNTHESIS
TRANSMISSION ELECTRON MICROSCOPY
TRAPPING
VISIBLE RADIATION
X-RAY DIFFRACTION
X-RAY PHOTOELECTRON SPECTROSCOPY
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Summary:Highlights: • BiPO{sub 4}/BiOBr p–n junction photocatalysts were synthesized by a solvothermal method. • BiPO{sub 4}/BiOBr composites were constructed by inlaying BiPO{sub 4} particles into BiOBr microspheres. • BiPO{sub 4}/BiOBr photocatalysts exhibited the enhanced photocatalytic activity. • ·O{sub 2}{sup −} and h{sup +} were the main active species responsible for the degradation of RhB. - Abstract: BiPO{sub 4}/BiOBr p–n junction photocatalysts were successfully synthesized via a facile one-pot solvothermal method. The products were characterized by XRD, FE-SEM, HRTEM, XPS, DRS, PL and EIS. The obtained BiPO{sub 4}/BiOBr composites were constructed by inlaying BiPO{sub 4} nanoparticles into BiOBr hierarchical microspheres. Compared with BiPO{sub 4} and BiOBr, they exhibited significantly enhanced visible light photocatalytic activity towards the degradation of Rhodamine B (RhB). Among them, 10% BiPO{sub 4}/BiOBr showed the maximum value of the activity, whose degradation rate was about three times higher than that of pure BiOBr. The enhanced photocatalytic activity could be attributed to the formation of the BiPO{sub 4}/BiOBr p–n junction, which resulted in the effective separation and transfer of photogenerated electron–hole pairs. Moreover, the trapping experiments confirmed that ·O{sub 2}{sup −} and h{sup +} were the main active species responsible for the degradation of RhB.
ISSN:0025-5408
1873-4227
DOI:10.1016/J.MATERRESBULL.2014.12.020