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Article

TiO2 and N-TiO2 Sepiolite and Zeolite Composites for Photocatalytic Removal of Ofloxacin from Polluted Water

1
Department of Chemistry, University of Pavia, via Taramelli 12, 27100 Pavia, Italy
2
Department of Chemistry and Industrial Chemistry, University of Genoa, via Dodecaneso 31, 16146 Genova, Italy
*
Author to whom correspondence should be addressed.
Materials 2020, 13(3), 537; https://doi.org/10.3390/ma13030537
Received: 18 December 2019 / Revised: 14 January 2020 / Accepted: 21 January 2020 / Published: 23 January 2020
(This article belongs to the Special Issue TiO2-Based Nanostructures, Composites and Hybrid Photocatalysts)
TiO2 sepiolite and zeolite composites, as well the corresponding N-doped composites, synthesized through a sol–gel method, were tested for the photocatalytic degradation of a widespread fluoroquinolone antibiotic (ofloxacin) under environmental conditions. The catalysts were characterized by X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET), scanning electron microscopy (SEM), and diffuse reflectance spectroscopy (DRS) analyses. A complete drug degradation occurred in 10–15 min in the presence of both TiO2 sepiolite and zeolite catalysts, and in 20–30 min with the N-doped ones. Sepiolite proved to be a better TiO2 support compared to the most common zeolite both in terms of adsorption capacity and photocatalytic efficiency in pollutants degradation. The influence of nitrogen doping (red shift from 3.2 to 3.0 eV) was also investigated. Although it was blurred by a marked increase of the particle dimension and thus a decrease of the specific surface area of the doped catalysts, it allowed a faster drug removal than direct photolysis. The photochemical paths and photoproducts were investigated, too. View Full-Text
Keywords: sepiolite; zeolite; photocatalysis; TiO2-based composites; fluoroquinolone; water remediation sepiolite; zeolite; photocatalysis; TiO2-based composites; fluoroquinolone; water remediation
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MDPI and ACS Style

Sturini, M.; Maraschi, F.; Cantalupi, A.; Pretali, L.; Nicolis, S.; Dondi, D.; Profumo, A.; Caratto, V.; Sanguineti, E.; Ferretti, M.; Albini, A. TiO2 and N-TiO2 Sepiolite and Zeolite Composites for Photocatalytic Removal of Ofloxacin from Polluted Water. Materials 2020, 13, 537. https://doi.org/10.3390/ma13030537

AMA Style

Sturini M, Maraschi F, Cantalupi A, Pretali L, Nicolis S, Dondi D, Profumo A, Caratto V, Sanguineti E, Ferretti M, Albini A. TiO2 and N-TiO2 Sepiolite and Zeolite Composites for Photocatalytic Removal of Ofloxacin from Polluted Water. Materials. 2020; 13(3):537. https://doi.org/10.3390/ma13030537

Chicago/Turabian Style

Sturini, Michela, Federica Maraschi, Alice Cantalupi, Luca Pretali, Stefania Nicolis, Daniele Dondi, Antonella Profumo, Valentina Caratto, Elisa Sanguineti, Maurizio Ferretti, and Angelo Albini. 2020. "TiO2 and N-TiO2 Sepiolite and Zeolite Composites for Photocatalytic Removal of Ofloxacin from Polluted Water" Materials 13, no. 3: 537. https://doi.org/10.3390/ma13030537

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