AI Article Synopsis

  • The study focused on improving the breakdown of antibiotics in aquaculture waste by synthesizing carbon dots (CD) and coupling them with titanium dioxide (TiO) to create nanocomposites.
  • Two methods for preparing the nanocomposites, in-situ and ex-situ, were tested using common antibiotics in aquaculture: oxolinic acid (OXA) and sulfadiazine (SDZ).
  • Results showed that the CD@TiO composite significantly increased the degradation rate of SDZ under solar light, while CD/TiO improved the breakdown of OXA, highlighting the potential of these eco-friendly nanocomposites for environmental applications.

Article Abstract

In this work, carbon dots (CD) were synthesized and coupled to titanium dioxide (TiO) to improve the photodegradation of antibiotics in aquaculture effluents under solar irradiation. Oxolinic acid (OXA) and sulfadiazine (SDZ), which are widely used in aquaculture, were used as target antibiotics. To prepare nanocomposites of CD containing TiO, two modes were used: in-situ (CD@TiO) and ex-situ (CD/TiO). For CD synthesis, citric acid and glycerol were used, while for TiO synthesis, titanium butoxide was the precursor. In ultrapure water (UW), CD@TiO and CD/TiO showed the largest photocatalytic effect for SDZ and OXA, respectively. Compared with their absence, the presence of CD@TiO increased the photodegradation of SDZ from 23 to 97% (after 4 h irradiation), whereas CD/TiO increased the OXA photodegradation from 22 to 59% (after 1 h irradiation). Meanwhile, in synthetic sea salts (SSS, 30‱, simulating marine aquaculture effluents), CD@TiO allowed for the reduction of SDZ's half-life time () from 14.5 ± 0.7 h (in absence of photocatalyst) to 0.38 ± 0.04 h. Concerning OXA in SSS, the remained the same either in the absence of a photocatalyst or in the presence of CD/TiO (3.5 ± 0.3 h and 3.9 ± 0.4 h, respectively). Overall, this study provided novel perspectives on the use of eco-friendly CD-TiO nanocomposites for the removal of antibiotics from aquaculture effluents using solar radiation.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8704068PMC
http://dx.doi.org/10.3390/toxics9120330DOI Listing

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