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    Methyl orange removal by combined visible-light photocatalysis and membrane distillation

    Year: 2013

    Journal: Dyes and Pigments, 2013, 98 (1) pp 106-112, 20130926

    Authors: Yuning Huo, Zongli Xie, Xingdong Wang, Hexing Li, Mahn Hoang, Rachel A. Caruso

    Organizations: The Education Ministry Key Lab of Resource Chemistry, Shanghai Key Laboratory of RE Functional Materials, Shanghai Normal University, Shanghai 200234, China; CSIRO Materials Science and Engineering, Private Bag 33, Clayton South, VIC 3169, Australia; Particulate Fluids Processing Centre, School of Chemistry, The University of Melbourne, Parkville, VIC 3010, Australia

    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 View the MathML sourceO2− 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.