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Removal of atrazine by photoelectrocatalytic process under sunlight using WN-codoped TiO2 photoanode.

Komtchou, Simon; Delegan, Nazar; Dirany, Ahmad; Drogui, Patrick; Robert, Didier; El Khakani, My Ali (9999). Removal of atrazine by photoelectrocatalytic process under sunlight using WN-codoped TiO2 photoanode. Journal of Applied Electrochemistry . DOI: 10.1007/s10800-018-1253-8. (Sous Presse)

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Résumé

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The present study was focused on the degradation of Atrazine (ATZ) and major by-products (DEA, DIA, DEDIA and ATZ-OH) from water by photoelectrocatalytic (PEC) oxidation process under solar light. The undoped TiO2, sub-stoichiometric TiO2 (TiO2−x) and codoped TiO2(TiO2:WN) photoanodes were prepared by means of a radio frequency magnetron sputtering (RF-MS) deposition process. The X-ray photoelectron spectra (XPS) analysis shows that the N and W atoms were incorporated into the O and Ti lattice sites of TiO2 respectively (case of TiO2:WN film), while the XPS measurements of the TiO2−x films composition was determined to be TiO1.9. The UV–Vis transmittance spectra shows that in the case of the TiO2:WN films, the presence of nitrogen and tungsten improve the optical response of TiO2 under visible range compare to the presence of oxygen vacancies in to the TiO2−x films. The experimental results under solar light with an initial concentration of ATZ (100 µg L−1) show that after 180 min of treatment, the degradation of ATZ were 34.98%, 68.57% and 94.33% using TiO2, TiO2−x and TiO2:WN photoanodes, respectively. These results of ATZ degradation proved that TiO2:WN photoanode was more photoactive under solar light. The evolution by-products of ATZ under sunlight show that the principal mechanism of ATZ degradation was the oxidation of alkyl side chain and dealkylation.

Type de document: Article
Mots-clés libres: atrazine; photoelectrocatalytic oxidation; sub-stoichiometric TiO₂; codoped TiO₂; dealkylation
Centre: Centre Eau Terre Environnement
Date de dépôt: 23 oct. 2018 20:16
Dernière modification: 23 oct. 2018 20:16
URI: http://espace.inrs.ca/id/eprint/7744

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