Double-side active TiO2-modified nanofiltration membranes in continuous flow photocatalytic reactors for effective water purification

[Display omitted] ► A novel CVD reactor for the developments of double side active TiO2 membranes. ► Double side active TiO2 membranes efficiently photodegrade organic pollutants. ► A photocatalytic membrane purification device for continuous flow water treatment. A chemical vapour deposition (CVD)...

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Bibliographic Details
Published in:Journal of hazardous materials 2012-04, Vol.211-212, p.304-316
Main Authors: Romanos, G.Em, Athanasekou, C.P., Katsaros, F.K., Kanellopoulos, N.K., Dionysiou, D.D., Likodimos, V., Falaras, P.
Format: Article
Language:English
Subjects:
Aluminum Oxide - chemistry
Azo Compounds - chemistry
Azo Compounds - radiation effects
Catalysis
Coloring Agents - chemistry
Coloring Agents - radiation effects
Continuous flow
Filtration - instrumentation
Membranes, Artificial
methyl orange
monitoring
nanofiltration
nanoparticles
NF membranes
permeability
Photolysis
Pollutant photodegradation
pollutants
titanium
Titanium - chemistry
titanium dioxide
Ultra thin TiO2 layers
ultraviolet radiation
Ultraviolet Rays
vapors
water flow
Water Pollutants, Chemical - chemistry
Water Pollutants, Chemical - radiation effects
Water purification
Water Purification - instrumentation
Water Purification - methods
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Summary:[Display omitted] ► A novel CVD reactor for the developments of double side active TiO2 membranes. ► Double side active TiO2 membranes efficiently photodegrade organic pollutants. ► A photocatalytic membrane purification device for continuous flow water treatment. A chemical vapour deposition (CVD) based innovative approach was applied with the purpose to develop composite TiO2 photocatalytic nanofiltration (NF) membranes. The method involved pyrolytic decomposition of titanium tetraisopropoxide (TTIP) vapor and formation of TiO2 nanoparticles through homogeneous gas phase reactions and aggregation of the produced intermediate species. The grown nanoparticles diffused and deposited on the surface of γ-alumina NF membrane tubes. The CVD reactor allowed for online monitoring of the carrier gas permeability during the treatment, providing a first insight on the pore efficiency and thickness of the formed photocatalytic layers. In addition, the thin TiO2 deposits were developed on both membrane sides without sacrificing the high yield rates. Important innovation was also introduced in what concerns the photocatalytic performance evaluation. The membrane efficiency to photo degrade typical water pollutants, was evaluated in a continuous flow water purification device, applying UV irradiation on both membrane sides. The developed composite NF membranes were highly efficient in the decomposition of methyl orange exhibiting low adsorption-fouling tendency and high water permeability.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2011.09.081