Journal
DYES AND PIGMENTS
Volume 98, Issue 1, Pages 106-112Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2013.02.009
Keywords
Photocatalytic membrane reactor; Flower-like BiOBr microspheres; Direct contact membrane distillation; Photocatalytic degradation; Methyl orange; Visible-light
Funding
- CSIRO Water for Healthy Country National Research Flagship
- National Natural Science Foundation of China [20937003, 21261140333, 21237003, 21207091]
- Shanghai Government [12230706000, 11JC1409000, 12YZ091]
- Australian Research Council [FT0990583]
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A photocatalytic membrane reactor combining a visible-light BiOBr photocatalyst and direct contact membrane distillation was studied for the removal of methyl orange from an aqueous solution. The hierarchical flower-like BiOBr microspheres, assemblies of BiOBr nanosheets, exhibited high efficiency for methyl orange photo-degradation under visible-light irradiation and due to their large specific surface area, their visible-light absorbance and the lower recombination of photo-generated electrons and holes. The main active species during the photo-degradation process was determined to be O-2(-) radicals. The organic pollutant and catalyst were retained on the feed side, as the membrane distillation only allowed water vapor to permeate through the hydrophobic membrane, leading to a high quality water stream on the permeate side. The micrometer size of the BiOBr photocatalyst may prevent fouling of the polytetrafluoroethylene membrane, making the photocatalytic membrane reactor applicable for industrial wastewater treatment. (C) 2013 Elsevier Ltd. All rights reserved.
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