Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 244, Issue -, Pages 303-312Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2018.11.044
Keywords
Photocatalysis; Surfactant degradation; Charge carrier injection; Photosensitization; Cobalt(II) 2-ethylhexanoate
Funding
- Fondazione De Nora within a Fondazione Oronzio e Niccolo De Nora Fellowship in Applied Electrochemistry
- University degli Studi di Milano
- National Science Centre, Poland - SONATA project [UMO-2016/21/D/ST4/00221]
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In this paper we propose titanium dioxide modified with cobalt(II) 2-ethylhexanoate (Co@TiO2) as photoactive material for the efficient visible light driven production of H2O2. We demonstrate that visible light activity can be achieved thanks to a photoinduced electron transfer from the excited complex towards the TiO2 conduction band that corresponds to a cobalt-to-titanium-charge-transfer transition. H2O2 is synthetized by a combination of oxygen reduction and water oxidation, that is possible thanks to the correct band position of Co@TiO2. A mechanism of H2O2 formation is suggested on the basis of experimental evidences. Reactive oxygen intermediates, together with H2O2 are responsible for the photocatalytic degradation of a nonionic surfactant, methylene blue and phenol for wastewater treatments. Finally, and quite interestingly, Co@TiO2 can be also used in a photo-electrochemical setup, where it can be adopted both as photoanode and photocatode, and the switching potential corresponds to the redox potential of the adsorbed complex Co(III)/Co(II) couple.
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