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摘要
A photo-catalysis and dynamic membrane reactor system (PMR), with coated nanoCaCO(3) 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 nanoCaCO(3) dynamic membranes was conducted. The pre-coated dynamic membrane can significantly enhance the filtration performance and improve the retention of photocatalysts. Particularly, nanoCaCO(3) 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 nanoCaCO(3) dynamic membrane, the PMR system with nanoCaCO(3)-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.
- 出版日期2013-7-17
- 单位大连理工大学
