Journal
APPLIED SURFACE SCIENCE
Volume 457, Issue -, Pages 925-932Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2018.07.024
Keywords
Au- Bi2WO6; Hollow microspheres; Photocatalyst; Cr(VI)
Categories
Funding
- Natural Science Foundation of China [11504321, 21101135, 51171168]
- Natural Science Foundation of Jiangsu Province [BK20150437]
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Pristine Bi2WO6 hollow microspheres have been fabricated in ethylene glycol-water system with CTAB as crystal growth director for the first time, hybrid Au- Bi2WO6 hollow microspheres was also obtained by in situ decoration of Au nanoparticles, the formation mechanisms were explored. Their photocatalytic activities on photoreduction of Cr(VI) and photo-degradation of phenol in aqueous solution were investigated under visible light irradiation. Hybrid Au- Bi2WO6 hollow microspheres displayed the highest photocatalytic activity, exhibiting a nearly complete reduction of Cr(VI) to Cr(III) within only 20 min. The excellent photocatalytic activities of heterogeneous Au-Bi2WO6 hollow microspheres can be induced by the increased light harvesting efficiency (due to light multi-scattering effect of hollow architecture), high separation of photogenerated electron-hole pairs caused by electron trapping effect and surface plasmon resonance (SPR) effect of Au nanoparticles.
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