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Photolysis and TiO2 Photocatalytic Treatment of Naproxen: Degradation, Mineralization, Intermediates and Toxicity
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Fabiola Méndez-Arriaga
Published/Copyright:
November 30, 2016
Abstract
The heterogeneous photocatalytic degradation of Naproxen using TiO2 as photocatalyst was investigated. Effects of TiO2 loading, temperature, volumetric flow and dissolved oxygen concentration, as operational parameters, were studied. The experiments were carried out in a 0.078 L Duran reactor equipped with a 1kW Xe-lamp. After 3 hours of photolysis, a Naproxen aqueous solution (0.8 mmol//L) results in a 90% removal with only a 5% of mineralization whereas the TiO2 photocatalysis leads lower removal (40%) with better mineralization (20%). Identification of byproducts has shown that demethylation and decarboxylation are the principal initial processes in the degradation of NPX. The toxicity of the treated solution was evaluated using the Microtox test based on the bioluminescent bacteria Vibro fisheri, in order to compare the acute toxicity of Naproxen and its photoproducts. Photocatalysis did not show an improvement in the biodegradability under the operational conditions tested. However, mineralization data are promising for future studies.
Received: 2008-3-26
Revised: 2008-6-16
Accepted: 2008-6-18
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
- 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
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