Spectroscopic and Mass-Spectrometric Study of Acridine Orange Photodegradation on the Surface of Mesoporous TiO2, SiO2 /TiO2 and SiO2 Films
-
N. I. Surovtseva
,
Т. V. Fesenko
Abstract
The efficiency of nanosized mesoporous TiO2, SiO2/TiO2 and SiO2 films as photocatalytic coverings has been demonstrated by the example of adsorbed acridine orange (AO) dye photodegradation in air. SiO2 - and TiO2 - based functional coatings were prepared via template assisted sol-gel method. The films were characterized by electron microscopy (SEM, TEM), FTIR and UV-Vis spectroscopy. Hydrophylic properties of prepared films were estimated from the water contact angle measurements. Electronic spectra and LDI mass-spectra changes accompanying AO photodegradation under the UV-exposure were investigated and main photodestruction products have been determined. We suggest the photobleach of adsorbed AO on the surface of researched films is a result of the oxidation reaction of dye molecule with the oxygen species such as singlet oxygen and OH• radical produced in the gas phase in presence of titania as well as in presence of sensitizer AO on silica surface. The observed photobleach of AO on the SiO2 and SiO2/TiO2 films proceeds through the photooxidative Ndemethylation of dimethylaminogroup in dye. Electronic and laser desorption/ionisation mass spectra give evidence that efficient photobleach of AO localized at the surface of anatase films proceeds through the following steps: 1- N-demethylation; 2- photodimerization; 3- photodegradation.
© 2016 by Walter de Gruyter Berlin/Boston
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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
