Photoelectrocatalytic Oxidation of Ethinylestradiol on a Ti/TiO<sub>2</sub> Electrode: Degradation Efficiency and Search for By-Products — Oak Academic Publishing
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Photoelectrocatalytic Oxidation of Ethinylestradiol on a Ti/TiO<sub>2</sub> Electrode: Degradation Efficiency and Search for By-Products
Departamento de Ciências Exatas e Aplicadas, Universidade Federal de Ouro Preto, Loanda, Brazil
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Instituto de Química, Universidade Estadual Paulista, Araraquara, Brazil
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Instituto de Química, Universidade Estadual Paulista, Araraquara, Brazil
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Departamento de Química, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
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Departamento de Química, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
1 Departamento de Ciências Exatas e Aplicadas, Universidade Federal de Ouro Preto, Loanda, Brazil
2 Instituto de Química, Universidade Estadual Paulista, Araraquara, Brazil
3 Instituto de Química, Universidade Estadual Paulista, Araraquara, Brazil
4 Departamento de Química, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
5 Departamento de Química, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
The degradation of ethinylestradiol (EE, an orally bio-active estrogen) in an aqueous-methanolic solution using a Ti/TiO 2 thin-film electrode and UV radiation (a photoelectrocatalytic system) was evaluated. Hence, HPLC/UV analysis shows that EE (at 0.34 mmol) is totally consumed after 30 minutes of exposure to the photoelectrocatalytic system in the presence of Na 2 SO 4 (0.1 mol·L - 1 ) and with an applied bias potential of +1.0 V versus the Ag/AgCl reference electrode. Moreover, monitoring by direct infusion electrospray ionization mass spectrometry (ESI-MS) and SPME-GC/ MS (solid phase microextraction coupled with gas chromatography-mass spectrometry) reveals that apparently no degradation products are formed under these conditions. Hence, this study demonstrates that the photoelectrocatalytic system can be efficiently used to promote the complete degradation (and likely mineralization) of this hormone under these conditions.
KeywordsPhotoelectrocatalytic OxidationEthinylestradiolTi/TiO<sub>2</sub>Thin-Film ElectrodeDegradation EfficiencySearch for By-Products
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