Photocatalysis with TiO2 and SnO2/TiO2 Films Examined by a Kinetic Model
-
Dessislava Mladenova
and
Gianluca Li Puma
Abstract
Here we prepare TiO2 films and coupled SnO2/TiO2 films on glass substrates by using dip coating and spin coating and test their photocatalytic action with respect to the degradation of methylene blue in a water solution. The SnO2 layer of the mixed SnO2/TiO2 films is deposited on the glass by different methods to vary its properties: thickness, grain size and surface morphology. The TiO2 films are deposited on the SnO2 film by dip coating from a suspension of Degusssa P25 powder. Of better performance are the TiO2 films prepared by spin coating due to the improved film morphology. The coupled films SnO2/TiO2 (10-cycles SnO2 and 1-cycle TiO2) are of much better photocatalytic activity than the respective counterparts of pure SnO2 and TiO2 films. The SnO2 film prepared from sol-gel increases in a similar way the photocatalytic activity of the TiO2-film overcoat. In general, the kinetics of photocatalysis in a quiescent liquid is found to obey a two-stage mechanism, which is described quantitatively by a theoretical model assuming fast initial adsorption of the dye on the film followed by slow dye degradation. This model allows distinguishing fine details in the experimental data attributed to the effects of various factors on the photocatalytic action of the films.
© 2016 by Walter de Gruyter Berlin/Boston
Articles in the same Issue
- Toxicity Assessment and Degradation of Disperse Azo Dyes by Photoelectrocatalytic Oxidation on Ti/TiO2 Nanotubular Array Electrodes
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- Oxidation of Higher Alkanes at Moderate Reaction Conditions with Ozone in Presence of Mesoporous Materials
- Modulating the Oxidation of FMNH2 by Organophosphorus Compounds
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- Epoxidation of Allyl Alcohol to Glycidol over Titanium-Silicalite Ti-Beta and Ti-MCM-41 Catalysts
- Photocatalysis with TiO2 and SnO2/TiO2 Films Examined by a Kinetic Model
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- Effect of Ozone Oxidation on the Molecular and Kinetic Properties of Effluent Organic Matter
- Treatment of Antibiotic Formulation Wastewaters by Fenton Process
- Homogeneous and Heterogeneous Catalytic Ozonation of Pulp Bleaching Effluent
- Spectroscopic and Mass-Spectrometric Study of Acridine Orange Photodegradation on the Surface of Mesoporous TiO2, SiO2 /TiO2 and SiO2 Films
- Application of Response Surface Methodology to Optimise C.I. Acid Orange 7 Azo Dye Mineralization by UV/H2O2 Process
- Chemical Treatment by Fenton’s Reagent Oxidation and Ozonation of Wastewaters from Olive Oil Mill
- Analysis of Primary Degradation and Decolourization of Dyes in Water by an H2O2/UV Advanced Oxidation Process
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Articles in the same Issue
- Toxicity Assessment and Degradation of Disperse Azo Dyes by Photoelectrocatalytic Oxidation on Ti/TiO2 Nanotubular Array Electrodes
- Photolysis and TiO2 Photocatalytic Treatment of Naproxen: Degradation, Mineralization, Intermediates and Toxicity
- Oxidation of Higher Alkanes at Moderate Reaction Conditions with Ozone in Presence of Mesoporous Materials
- Modulating the Oxidation of FMNH2 by Organophosphorus Compounds
- Enhancement of the Photodegradation of Methylene Blue by Combined Titania Photocatalyst and Photo-Fenton
- Epoxidation of Allyl Alcohol to Glycidol over Titanium-Silicalite Ti-Beta and Ti-MCM-41 Catalysts
- Photocatalysis with TiO2 and SnO2/TiO2 Films Examined by a Kinetic Model
- Photolytic and Photocatalytic Diminution and Preliminary Genotoxicity Studies of 2-Chloropyridine
- Photocatalytic Degradation of 4-Nitrophenol in a Continuous Reactor Containing Titanium Dioxide Supported on Glass Beads
- Photocatalytic Inactivation of Wild and Hyper-Adherent E. Coli Strains in Presence of Suspended or Supported TiO2. Influence of the Isoelectric Point of the Particle Size and of the Adsorptive Properties of Titania
- Comparison of UV- and UV/VUV-Induced Photolytic and Heterogeneous Photocatalytic Degradation of Phenol, with Particular Emphasis on the Intermediates
- Effect of Ozone Oxidation on the Molecular and Kinetic Properties of Effluent Organic Matter
- Treatment of Antibiotic Formulation Wastewaters by Fenton Process
- Homogeneous and Heterogeneous Catalytic Ozonation of Pulp Bleaching Effluent
- Spectroscopic and Mass-Spectrometric Study of Acridine Orange Photodegradation on the Surface of Mesoporous TiO2, SiO2 /TiO2 and SiO2 Films
- Application of Response Surface Methodology to Optimise C.I. Acid Orange 7 Azo Dye Mineralization by UV/H2O2 Process
- Chemical Treatment by Fenton’s Reagent Oxidation and Ozonation of Wastewaters from Olive Oil Mill
- Analysis of Primary Degradation and Decolourization of Dyes in Water by an H2O2/UV Advanced Oxidation Process
- A Novel Adsorption/Saturation Approach to Ultrasonic Degradation of Phenol
