Journal ArticleDOI
Photochemistry on surfaces. 4. Influence of support material on the photochemistry of an adsorbed dye
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In this paper, the absorption and emission properties of rose bengal have been characterized on the surfaces of SiO{sub 2, AlOsub 2 O{sub 3, and TiO{ sub 2} particles.Abstract:
The absorption and emission properties of rose bengal have been characterized on the surfaces of SiO{sub 2}, Al{sub 2}O{sub 3}, and TiO{sub 2} particles. The intrinsic properties of these oxide supports play an important role in effecting and controlling the photochemistry of the adsorbed dye. On the Al{sub 2}O surface, a biphotonic photoionization process leads to the production of semioxidized dye. However, a charge injection from the excited dye into the conduction band dominates on the TiO{sub 2} particles. Steady-state photolysis indicates a rapid photodegradation of the dye only on the surface of TiO{sub 2}. The diffuse reflectance laser flash photolysis experiments which elucidate the mechanism of photochemical processes on these oxide supports are described.read more
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Journal ArticleDOI
The design and development of highly reactive titanium oxide photocatalysts operating under visible light irradiation
Masakazu Anpo,Masato Takeuchi +1 more
TL;DR: In this paper, the preparation of highly reactive titanium oxide photocatalysts and the clarification of the active sites as well as the detection of the reaction intermediates at the molecular level are discussed.
Journal ArticleDOI
Heterogeneous photocatalytic treatment of organic dyes in air and aqueous media
Krishnan Rajeshwar,Marly E. Osugi,Wilaiwan Chanmanee,C. R. Chenthamarakshan,Maria Valnice Boldrin Zanoni,Puangrat Kajitvichyanukul,R. Krishnan-Ayer +6 more
TL;DR: In this article, a review focusing on the heterogeneous photocatalytic treatment of organic dyes in air and water is presented, which includes historical aspects, dark adsorption of the dye on the semiconductor surface and its role in the subsequent photoreaction, semiconductor preparation details, photoreactor configurations, photooxidation kinetics/mechanisms and comparison with other Advanced Oxidation Processes (e.g., UV/H 2 O 2, ozonation, UV/O 3, Fenton and photo-Fenton reactions), visible light-
Journal ArticleDOI
Visible light-induced photocatalytic degradation of Acid Orange 7 in aqueous TiO2 suspensions
TL;DR: In this article, the photocatalytic degradation of a model azo-dye (Acid Orange, AO7) in aerated aqueous TiO2 dispersion has been studied under visible light (λ>400 nm) irradiation.
Journal ArticleDOI
Environmental Photochemistry on Semiconductor Surfaces: Photosensitized Degradation of a Textile Azo Dye, Acid Orange 7, on TiO2 Particles Using Visible Light
TL;DR: In this article, the degradation of a textile azo dye, acid orange 7, has been carried out on TiO2 particles using visible light using diffuse reflectance absorption and FTIR techniques.
Journal ArticleDOI
TiO2-assisted photodegradation of dye pollutants : II. Adsorption and degradation kinetics of eosin in TiO2 dispersions under visible light irradiation
TL;DR: In this paper, the degradation kinetics followed a Langmuir-Hinshelwood type equation and the rate was greater in acid media than in neutral and alkaline media, which correlates with the adsorption behavior of eosin on the TiO2 surface.