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A photo-catalysis and rotating nano-CaCO3 dynamic membrane system with Fe-ZnIn2S4 efficiently removes halogenated compounds in water

Paper ID Volume ID Publish Year Pages File Format Full-Text
46208 46435 2013 8 PDF Available
Title
A photo-catalysis and rotating nano-CaCO3 dynamic membrane system with Fe-ZnIn2S4 efficiently removes halogenated compounds in water
Abstract

A photo-catalysis and dynamic membrane reactor system (PMR), with coated nanoCaCO3 layer on polypropylene non-woven fabric material, was studied for continuous photocatalysis and retention of catalysts in a single device, in removing halogenated compounds (2,4,6-Tribromophenol and 2,4-Dichlorophenol) in water. Both the batch and the continuous photocatalytic experiments were carried out to investigate the efficiency in COD removal, in removing halogenated compounds and in dehalogenation. A comparison of the separation performance of photocatalysts between bare (uncoated) and pre-coated nanoCaCO3 dynamic membranes was conducted. The pre-coated dynamic membrane can significantly enhance the filtration performance and improve the retention of photocatalysts. Particularly, nanoCaCO3 was found able to assist and improve debromination efficiency during UV irradiated photolysis. Tentative debromination pathway and dehalogenation mechanism were proposed. Due to the assisted additional reaction by the nanoCaCO3 dynamic membrane, the PMR system with nanoCaCO3-coating and Fe-ZnIn2S4 completely removed halogenated compounds, achieved highest COD removal (72% for 2,4,6-Tribromophenol and 75% for 2,4-Dichlorophenol), 85–90% debromination and 99% dechlorination efficiencies. The long-term continuous photocatalytic debromination experiments demonstrated that the dynamic membrane hybrid system was very steady in the long-term operation and the debromination maintained at about 85% during the 40 h photocatalytic debromination reaction. The combination of dynamic membrane and photocatalysis provides a new alternative for practical application of photocatalysis.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► A continuous photocatalysis and CaCO3 dynamic membrane reaction system is studied. ► CaCO3 significantly enhanced dehalogenation under UV irrdiation. ► The hybrid system is steady during long-term operation. ► The hybrid system indicates great application prospect in wastewater treatment.

Keywords
PMR, photocatalytic membrane reactor; 2,4,6-TBP, 2,4,6-Tribromophenol; 2,4-DCP, 2,4-DichlorophenolPhotocatalytic membrane reactor; Dynamic membrane; 2,4,6-Tribromophenol; 2,4-Dichlorophenol
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A photo-catalysis and rotating nano-CaCO3 dynamic membrane system with Fe-ZnIn2S4 efficiently removes halogenated compounds in water
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 138–139, 17 July 2013, Pages 62–69
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us