title: Double-side active TiO2-modified nanofiltration membranes in continuous flow photocatalytic reactors for effective water purification.
abstract: A chemical vapour deposition (CVD) based innovative approach was applied with the purpose to develop composite TiO(2) photocatalytic nanofiltration (NF) membranes. The method involved pyrolytic decomposition of titanium tetraisopropoxide (TTIP) vapor and formation of TiO(2) 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 TiO(2) 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.
authors: Institute of Physical Chemistry, NCSR Demokritos, 153 10 Agia Paraskevi Attikis, Athens, Greece. groman@chem.demokritos.gr
authors: G Em
authors: GE
authors: Romanos
authors: C P
authors: CP
authors: Athanasekou
authors: F K
authors: FK
authors: Katsaros
authors: N K
authors: NK
authors: Kanellopoulos
authors: D D
authors: DD
authors: Dionysiou
authors: V
authors: V
authors: Likodimos
authors: P
authors: P
authors: Falaras
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry; D001391:Azo Compounds / Q000737:chemistry / Q000528:radiation effects; D002384:Catalysis; D004396:Coloring Agents / Q000737:chemistry / Q000528:radiation effects; D005374:Filtration / Q000295:instrumentation*; D008567:Membranes, Artificial; D010782:Photolysis; D014025:Titanium / Q000737:chemistry*; D014466:Ultraviolet Rays; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000528:radiation effects; D018508:Water Purification / Q000295:instrumentation* / Q000379:methods
chemical_list: D001391:Azo Compounds; D004396:Coloring Agents; D008567:Membranes, Artificial; D014874:Water Pollutants, Chemical; C009495:titanium dioxide; C100258:methyl orange; D014025:Titanium; D000537:Aluminum Oxide