Photoelectrocatalytic Oxidation of Ethinylestradiol on a Ti/TiO2 Electrode: Degradation Efficiency and Search for By-Products - Green and Sustainable Chemistry

GSC > Vol.4 No.3, August 2014

Volume 4, Issue 3 (August 2014)

ISSN Print: 2160-6951 ISSN Online: 2160-696X

Google-based Impact Factor: 1.8 Citations

Photoelectrocatalytic Oxidation of Ethinylestradiol on a Ti/TiO₂ Electrode: Degradation Efficiency and Search for By-Products ()

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DOI: 10.4236/gsc.2014.43020 3,845 Downloads 5,204 Views Citations

Author(s)

Karla Moreira Vieira, Fabiana Maria Monteiro Paschoal, Maria Valnice Boldrin Zanoni, Clésia Cristina Nascentes, Rodinei Augusti

Affiliation(s)

Departamento de Ciências Exatas e Aplicadas, Universidade Federal de Ouro Preto, Loanda, Brazil.
Departamento de Química, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil.
Instituto de Química, Universidade Estadual Paulista, Araraquara, Brazil.

ABSTRACT

The degradation of ethinylestradiol (EE, an orally bio-active estrogen) in an aqueous-methanolic solution using a Ti/TiO₂ 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 Na₂SO₄ (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.

KEYWORDS

Photoelectrocatalytic Oxidation, Ethinylestradiol, Ti/TiO₂ Thin-Film Electrode, Degradation Efficiency, Search for By-Products

Share and Cite:

Moreira Vieira, K. , Maria Monteiro Paschoal, F. , Valnice Boldrin Zanoni, M. , Cristina Nascentes, C. and Augusti, R. (2014) Photoelectrocatalytic Oxidation of Ethinylestradiol on a Ti/TiO₂ Electrode: Degradation Efficiency and Search for By-Products. Green and Sustainable Chemistry, 4, 151-161. doi: 10.4236/gsc.2014.43020.

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