Performance of TiO2-Based Tubular Membranes in the Photocatalytic Degradation of Organic Compounds

被引:3
作者
Barquin, Carmen [1 ]
Vital-Grappin, Aranza [1 ]
Kumakiri, Izumi [2 ]
Diban, Nazely [1 ]
Rivero, Maria J. [1 ]
Urtiaga, Ane [1 ]
Ortiz, Inmaculada [1 ]
机构
[1] Univ Cantabria, Dept Ingn Quim & Biomol, Avda Castros S-N, Santander 39005, Spain
[2] Yamaguchi Univ, Grad Sch Sci & Technol Innovat, Grad Sch Sci & Engn, Ube 7558611, Japan
关键词
photocatalysis; filtration; membrane; TiO2; Ag; COMPOSITE MEMBRANE; WATER SCARCITY; TIO2; REMOVAL; NANOPARTICLES; FILTRATION; REACTORS; ANATASE; RUTILE; FLUX;
D O I
10.3390/membranes13040448
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
This work presents the photocatalytic degradation of organic pollutants in water with TiO2 and TiO2/Ag membranes prepared by immobilising photocatalysts on ceramic porous tubular supports. The permeation capacity of TiO2 and TiO2/Ag membranes was checked before the photocatalytic application, showing high water fluxes (approximate to 758 and 690 L m(-2) h(-1) bar(-1), respectively) and <2% rejection against the model pollutants sodium dodecylbenzene sulfonate (DBS) and dichloroacetic acid (DCA). When the membranes were submerged in the aqueous solutions and irradiated with UV-A LEDs, the photocatalytic performance factors for the degradation of DCA were similar to those obtained with suspended TiO2 particles (1.1-fold and 1.2-fold increase, respectively). However, when the aqueous solution permeated through the pores of the photocatalytic membrane, the performance factors and kinetics were two-fold higher than for the submerged membranes, mostly due to the enhanced contact between the pollutants and the membranes photocatalytic sites where reactive species were generated. These results confirm the advantages of working in a flow-through mode with submerged photocatalytic membranes for the treatment of water polluted with persistent organic molecules, thanks to the reduction in the mass transfer limitations.
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页数:13
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