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

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388980%3A_____%2F21%3A00542041" target="_blank" >RIV/61388980:_____/21:00542041 - isvavai.cz</a>

Result on the web

<a href="http://hdl.handle.net/11104/0319536" target="_blank" >http://hdl.handle.net/11104/0319536</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1039/d0ra10403e" target="_blank" >10.1039/d0ra10403e</a>

Result language

angličtina

Original language name

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

Original language description

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.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10402 - Inorganic and nuclear chemistry

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2021

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

RSC Advances

ISSN

2046-2069

e-ISSN

2046-2069

Volume of the periodical

11

Issue of the periodical within the volume

23

Country of publishing house

GB - UNITED KINGDOM

Number of pages

12

Pages from-to

13980-13991

UT code for WoS article

000641127700034

EID of the result in the Scopus database

2-s2.0-85104356668