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The heterogeneous photocatalytic degradation of Naproxen using TiO 2  as photocatalyst was investigated. Effects of TiO 2  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.

Photolysis and TiO 2 Photocatalytic Treatment of Naproxen: Degradation, Mineralization, Intermediates and Toxicity