Photocatalytic vs. sonochemical removal of antibiotics in water: Structure-degradability relationship, mineralization, antimicrobial activity, and matrix effects
“…8 ) indicates that CPX and DOX are being transformed into organic compounds (byproducts) with probably low volatility and high hydrophilicity, which migrate to the bulk solution, where the concentration of radicals is much lower than in the interface (it implies that a total mineralization is not reached). A similar behavior has been found during the sonochemical degradation in water of various antibiotics [22] , [46] . Fig.…”
Highlights
Antibiotics cephalexin and doxycycline were removed using 40 kHz ultrasound.
Optimized conditions were selected.
Toxicity and mineralization data were analyzed.
Hydroxyl radicals seem to be the main oxidizing specie on treatment.
“…8 ) indicates that CPX and DOX are being transformed into organic compounds (byproducts) with probably low volatility and high hydrophilicity, which migrate to the bulk solution, where the concentration of radicals is much lower than in the interface (it implies that a total mineralization is not reached). A similar behavior has been found during the sonochemical degradation in water of various antibiotics [22] , [46] . Fig.…”
Highlights
Antibiotics cephalexin and doxycycline were removed using 40 kHz ultrasound.
Optimized conditions were selected.
Toxicity and mineralization data were analyzed.
Hydroxyl radicals seem to be the main oxidizing specie on treatment.
“…The enhancement by HCO 3 – in the sonochemical process contrasts with the effect of this anion on other oxidation processes, such as UVC/H 2 O 2 , photo-Fenton, TiO 2 -photocatalysis electrochemical oxidation, where bicarbonate mainly acts as a scavenger of radicals, affecting the elimination of organic pollutants [26] , [60] , [64] , [65] , [66] . The beneficial role of bicarbonate ions on the sonochemical system is explained considering the formation of the carbonate radical (CO 3 * − ) and its interaction with the contaminants in the solution bulk [54] , [63] , [67] .…”
Section: Ultrasound Treatment Of Organic Pollutants In Mineral Watermentioning
confidence: 94%
“…Due to the presence of organic pollutants in mineral water and their potential adverse effects on human health, some AOPs have been tested to degrade them in this inorganic ions-rich matrix [26] , [60] , [61] . Ultrasound has shown to be successful for the elimination of different organic compounds in mineral water ( Table 1 ).…”
Section: Ultrasound Treatment Of Organic Pollutants In Mineral Watermentioning
confidence: 99%
“…Recently, a comparison between the treatment of the antibiotic cefadroxil in mineral water by ultrasound and TiO 2 -photocatalysis has been done by Estrada-Flórez et al [60] . They also found that the performance of the sonochemical process is enhanced in mineral water.…”
Section: Ultrasound Treatment Of Organic Pollutants In Mineral Watermentioning
Highlights
Sonodegradation of organic pollutants in ions-rich matrices is critically reviewed.
Ultrasound is able to degrade pollutants of diverse nature in ions-rich matrices.
Low concentrations of contaminants favor degradation in mineral water and seawater.
Efficient pollutants sonodegradation in mineral water or seawater but action in urine is limited.
Ecotoxicity and transformations after ultrasound action on matrices must be tested.
“…The increasing demand for veterinary antibiotics is worrying (Roberts and Zembower 2021), considering the rise in the number of people owning pets like dogs and cats during this pandemic, numerous human diseases, and growing global demand for animal protein for human consumption. Since most antibiotics are poorly absorbed by humans and livestock, this widespread use of antibiotics raises the risk of significant quantities of residual antibiotics ending up in the environment (Li et al2015;Estrada-Flórez et al 2020;Chan et al 2020).…”
Here, metronidazole (MZ) antibiotic degradation and bactericidal efficacy of Co–Ni0.5Zn0.5Fe2O4 (Co–NZF) with and without photoactivation by UV light is reported as a viable cost-competitive water disinfection solution. Co–NZF has a total pore volume of 0.298 cm3 g− 1, a specific surface area of 70.2 m2 g− 1 and sufficiently high magnetic properties (80.35 emu g− 1). After 360 min of UV–assisted irradiation at pH 3, 10 mg Co–NZF, and 4 mM H2O2, the maximum MZ degradation was reached (92.8%). The adsorption result of 10 mg Co–NZF in the dark for 12 h resulted in 70.2% MZ removal, whereas MZ self-degradation was significantly minimal in a blank trial. In the presence of interfering anions and very high molecular weight tylosin antibiotic, Co–NZF maintained 51.7–75.4% degradation efficiency. The effect of the Co–NZF dosage on the viability of Staphylococcus aureus and Escherichia coli strains showed that 15 mg of the catalyst was sufficient to cause bactericidal activity after 180 min in the presence of UV light, while 25 mg is needed under dark conditions. In addition, when compared to Escherichia coli strains, Co–NZF showed higher inhibition against Staphylococcus aureus in time-kill experiments under dose variation.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
