Enhanced visible-light photodegradation of fluoroquinolone-based antibiotics andE. coligrowth inhibition using Ag-TiO2 nanoparticles

0542041 - ÚACH 2022 RIV GB eng J - Článek v odborném periodiku
Wang, J. - Svoboda, L. - Němečková, Zuzana - Sgarzi, M. - Henych, Jiří - Licciardello, N. - Cuniberti, Gi.
Enhanced visible-light photodegradation of fluoroquinolone-based antibiotics andE. coligrowth inhibition using Ag-TiO2 nanoparticles.
RSC Advances. Roč. 11, č. 23 (2021), s. 13980-13991. E-ISSN 2046-2069
Institucionální podpora: RVO:61388980
Klíčová slova: TiO2 nanoparticles * nanotube arrays * sewage-treatment plants
Obor OECD: Inorganic and nuclear chemistry
Impakt faktor: 4.036, rok: 2021
Způsob publikování: Open access

Antibiotics in wastewater represent a growing and worrying menace for environmental and human health fostering the spread of antimicrobial resistance. Titanium dioxide (TiO2) is a well-studied and well-performing photocatalyst for wastewater treatment. However, it presents drawbacks linked with the high energy needed for its activation and the fast electron-hole pair recombination. In this work, TiO2 nanoparticles were decorated with Ag nanoparticles by a facile photochemical reduction method to obtain an increased photocatalytic response under visible light. Although similar materials have been reported, we advanced this field by performing a study of the photocatalytic mechanism for Ag-TiO2 nanoparticles (Ag-TiO2 NPs) under visible light taking in consideration also the rutile phase of the TiO2 nanoparticles. Moreover, we examined the Ag-TiO2 NPs photocatalytic performance against two antibiotics from the same family. The obtained Ag-TiO2 NPs were fully characterised. The results showed that Ag NPs (average size: 23.9 ± 18.3 nm) were homogeneously dispersed on the TiO2 surface and the photo-response of the Ag-TiO2 NPs was greatly enhanced in the visible light region when compared to TiO2 P25. Hence, the obtained Ag-TiO2 NPs showed excellent photocatalytic degradation efficiency towards the two fluoroquinolone-based antibiotics ciprofloxacin (92%) and norfloxacin (94%) after 240 min of visible light irradiation, demonstrating a possible application of these particles in wastewater treatment. In addition, it was also proved that, after five Ag-TiO2 NPs re-utilisations in consecutive ciprofloxacin photodegradation reactions, only a photocatalytic efficiency drop of 8% was observed. Scavengers experiments demonstrated that the photocatalytic mechanism of ciprofloxacin degradation in the presence of Ag-TiO2 NPs is mainly driven by holes and ˙OH radicals, and that the rutile phase in the system plays a crucial role. Finally, Ag-TiO2 NPs showed also antibacterial activity towardsEscherichia coli(E. coli) opening the avenue for a possible use of this material in hospital wastewater treatment.
Trvalý link: http://hdl.handle.net/11104/0319536


Vědecká data: RSC publishing