title: Adsorption and photocatalytic and photosensitised bleaching of acid orange 7 on multilayer mesoporous films of TiO2.
abstract: A series of mesoporous films of titania of different thicknesses are prepared and their surface areas and porosities determined by physical adsorption using Kr as the adsorbate. The amounts of acid orange 7 (AO7) adsorbed by these films are found to be proportional to their measured surface areas and so the possibility of using this as a method of determining the surface area of thin titania films is discussed. The initial rates of UV-driven photocatalytic- and visible-driven photosensitised-bleaching of AO7 in solution, upon UVA and visible light irradiation, respectively, are also directly dependent upon the measured surface areas of the titania films. The quantum efficiencies for the UV photocatalytic- and visible photosensitised-bleaching of AO7 by the thickest of the AO7 films were estimated to be 0.08 and 0.01%, respectively.
authors: School of Chemistry and Chemical Engineering, Queen's University Belfast, Stranmillis Road, Belfast, BT9 5AG, United Kingdom. andrew.mills@qub.ac.uk
authors: Andrew
authors: A
authors: Mills
authors: Christopher
authors: C
authors: O'Rourke
authors: Vit
authors: V
authors: Kalousek
authors: Jiri
authors: J
authors: Rathousky
mesh_terms: D000327:Adsorption; D001391:Azo Compounds / Q000737:chemistry* / Q000528:radiation effects; D001557:Benzenesulfonates / Q000737:chemistry* / Q000528:radiation effects; D002384:Catalysis; D004396:Coloring Agents / Q000737:chemistry* / Q000528:radiation effects; D007726:Krypton / Q000737:chemistry; D008027:Light; D055668:Photochemical Processes; D016062:Porosity; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000528:radiation effects; D018508:Water Purification / Q000379:methods
chemical_list: D001391:Azo Compounds; D001557:Benzenesulfonates; D004396:Coloring Agents; D014874:Water Pollutants, Chemical; C009495:titanium dioxide; D007726:Krypton; D014025:Titanium; C014722:2-naphthol orange