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Comparison of UV- and UV/VUV-Induced Photolytic and Heterogeneous Photocatalytic Degradation of Phenol, with Particular Emphasis on the Intermediates
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Tünde Alapi
Published/Copyright:
November 30, 2016
Abstract
The application of UV photolysis (254 nm), UV/VUV photolysis (254/185 nm) and heterogeneous photocatalysis (TiO2, 254 nm) for the decomposition of phenol has been investigated and compared. For the experiments, the same experimental apparatus, with the same energy consumption has been used. The experimental results suggest that, beside the direct photolysis, HO• has important role in UV/VUV, while HO2• /O2•- in UV photolysis. In the presence of TiO2 the direct UV photolysis is completely suppressed because of the competitive light absorption between TiO2 particles and phenol. In UV or UV/VUV irradiated solutions, the total organic carbon (TOC) concentration decreases after the complete decomposition of phenol while, in the presence of TiO2 TOC and phenol concentration are found to decrease in parallel. In all cases the same aromatic (1,2- and 1,4- dihydroxybenzene) and aliphatic intermediates (maleic, tartaric and oxalic acid) are formed, their formation and decomposition were also systematically investigated and compared.
Received: 2008-5-8
Revised: 2008-7-17
Accepted: 2008-7-17
Published Online: 2016-11-30
Published in Print: 2008-8-1
© 2016 by Walter de Gruyter Berlin/Boston
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Articles in the same Issue
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- 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
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- Spectroscopic and Mass-Spectrometric Study of Acridine Orange Photodegradation on the Surface of Mesoporous TiO2, SiO2 /TiO2 and SiO2 Films
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