Photodegradation of oxolinic acid in aquaculture effluents under solar irradiation: is it possible to enhance efficiency by the use of TiO2/carbon quantum dots composites?

Antibiotics, such as oxolinic acid (OXA), in aquaculture effluents contribute to the dissemination of antimicrobial resistance, which makes it urgent to develop efficient and sustainable processes for their removal. Aiming a photocatalytic degradation under solar radiation, different carbon quantum...

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Bibliographic Details
Published in:Chemosphere (Oxford) 2022-12, Vol.308, p.136522, Article 136522
Main Authors: Silva, Valentina, Invêncio, Inês, Silva, Carla Patrícia, Otero, Marta, Lima, Diana L.D.
Format: Article
Language:English
Subjects:
Antibiotics
Antimicrobial resistance
Brackish aquaculture effluent
Visible-light photocatalysis
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Summary:Antibiotics, such as oxolinic acid (OXA), in aquaculture effluents contribute to the dissemination of antimicrobial resistance, which makes it urgent to develop efficient and sustainable processes for their removal. Aiming a photocatalytic degradation under solar radiation, different carbon quantum dots (CQDs) were produced in this work through a bottom-up hydrothermal methodology and incorporated into TiO2 by a simple calcination method. A total of thirteen materials were synthesized and tested for OXA photocatalytic removal from synthetic and real matrices. Among them, CQDs produced with citric acid and incorporated into TiO2 at 4% (w/w) (TiO2/CQDs-CA 4% (w/w)) were the most efficient photocatalysts, providing an OXA half-life time (t1/2) decrease of 91%, 79% and 85% in phosphate buffer solution (PBS), synthetic sea salts (SSS) and brackish aquaculture effluent (BAE), respectively. Therefore, the herein synthesized TiO2/CQDs-CA 4% (w/w) composites have shown to be promising materials for a sustainable solar-driven removal of antibiotics from aquaculture effluents. [Display omitted] •Two types of carbon quantum dots (CQDs) were blended with TiO2 at different w/w.•13 materials were tested for oxolinic acid (OXA) sun-driven photocatalysis.•TiO2/CQDs-CA 4% (w/w) was the most efficient in the photocatalytic removal of OXA.•OXA half-life times decreased by 79–91% in the simulated and real water matrices.•TiO2/CQDs-CA 4% (w/w) is promising for antibiotics sustainable photocatalysis.
ISSN:0045-6535
DOI:10.1016/j.chemosphere.2022.136522