期刊
MOLECULES
卷 22, 期 5, 页码 -出版社
MDPI
DOI: 10.3390/molecules22050704
关键词
titania nanotubes; nitrogen-doped nanotubes; photoelectrocatalysis; E. coli; visible light
资金
- Spanish Ministry of Economy and Competitiveness (MINECO) through the project WATER4FOOD [CTQ2014-54563-C3-1-R]
- Comunidad de Madrid through the program REMTAVARES [S2013/MAE-2716]
- Department of Employment and Learning Northern Ireland
- National Science Foundation under the US-Ireland collaborative partnership initiative [NSF-CBET-1033317]
- University of Cincinnati through a UNESCO co-Chair Professor position on Water Access and Sustainability
TiO2 photocatalysis is considered as an alternative to conventional disinfection processes for the inactivation of waterborne microorganisms. The efficiency of photocatalysis is limited by charge carrier recombination rates. When the photocatalyst is immobilized on an electrically conducting support, one may assist charge separation by the application of an external electrical bias. The aim of this work was to study electrochemically assisted photocatalysis with nitrogen doped titania photoanodes under visible and UV-visible irradiation for the inactivation of Escherichia coli. Aligned TiO2 nanotubes were synthesized (TiO2-NT) by anodizing Ti foil. Nanoparticulate titania films were made on Ti foil by electrophoretic coating (P25 TiO2). N-doped titania nanotubes and N,F co-doped titania films were also prepared with the aim of extending the active spectrum into the visible. Electrochemically assisted photocatalysis gave higher disinfection efficiency in comparison to photocatalysis (electrode at open circuit) for all materials tested. It is proposed that electrostatic attraction of negatively charged bacteria to the positively biased photoanodes leads to the enhancement observed. The N-doped TiO2 nanotube electrode gave the most efficient electrochemically assisted photocatalytic inactivation of bacteria under UV-Vis irradiation but no inactivation of bacteria was observed under visible only irradiation. The visible light photocurrent was only a fraction (2%) of the UV response.
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