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Photoelectrocatalytic oxidation of chlortetracycline using Ti/TiO2 photo-anode with simultaneous H2O2 production.

Daghrir, Rimeh; Drogui, Patrick; El Khakani, My Ali (2013). Photoelectrocatalytic oxidation of chlortetracycline using Ti/TiO2 photo-anode with simultaneous H2O2 production. Electrochimica Acta , vol. 87 . p. 18-31. DOI: 10.1016/j.electacta.2012.09.020.

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Résumé

This study investigated the photoelectrocatalytic oxidation (PECO) of chlortetracycline (CTC) in aqueous solution using a Ti/TiO2 photocatalyst. The Ti/TiO2 used as photo-anode was prepared by a pulsed laser deposition (PLD) method. The PLD TiO2 coatings were found to have rutile and anatase structures consisting of nano-crystallites of approximately 10 nm and 15 nm in diameter, respectively. The influence of various parameters such as crystallographic structure of Ti/TiO2, cathode material and pH were evaluated. Experimental results revealed that a current intensity of 0.39 A under UV irradiation (245 nm) for a period of treatment of 120 min was beneficial for CTC oxidation. The initial CTC concentration (25 mu g/L) could be optimally diminished up to 98.0 +/- 0.2% while using a Ti/TiO2 photo-anode having a crystallographic structure of anatase and using vitreous carbon as cathode. Under these conditions, a relatively high mineralization of CTC (67.3 +/- 2.15% of TOC removal and 69.3 +/- 3.10% of TN removal) was recorded. The initial rate of photoelectrocatalytic degradation of CTC can be well described by the Langmuir-Hinshelwood (L-H) kinetic model (R-2 = 0.9996) with a reaction rate constant of 17.3 mu g/L min. Likewise, microtox (Vibrio fisheri), microalga (Pseudokirchneriella Subcapitata) and Daphnia (Daphnia magna) biotests revealed that the treated - effluent was not toxic compared to the untreated effluent.

Type de document:
Mots-clés libres: photoelectrocatalysis; photo-anode; chlortetracycline; kinetics; toxicity
Centre: Centre Eau Terre Environnement
Date de dépôt: 05 déc. 2016 20:39
Dernière modification: 05 déc. 2016 20:39
URI: http://espace.inrs.ca/id/eprint/3412

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