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• W2517733145 abstract "To reveal the kinetics and mechanisms of antibiotic adsorption/desorption processes, batch and stirred flow chamber (SFC) experiments were carried out with oxytetracycline (OTC) on two marine sediments. The OTC adsorption capacities of the marine sediments were relatively weak and related to their organic carbon (OC) and contents of fine particles. Sorption isotherms of OTC on marine sediment can be well described by both the Langmuir and Freundlich models. Langmuir adsorption maxima (qmax) and Freundlich distribution coefficients (Kf) increased with the decrease of salinity and pH, which indicated the importance of variable charged sites on sediment surfaces. A second order kinetic model successfully described adsorption and desorption kinetics of OTC and well reproduced the concentration change during stop-flow. The adsorption kinetic rates (ka) for OTC under different experimental conditions ranged from 2.00 × 10-4 to 1.97 × 10-3 L (mg min)-1. Results of SFC experiments indicated that diffusive mass transfer was the dominant mechanism of the time-dependent adsorption of OTC and its release from marine sediment was mildly hysteretic. The high desorption percentage (43-75% for LZB and 58-75% for BHB) implied that binding strength of OTC on two marine sediments was weak. In conclusion, marine sediment characteristics and environmental factors such as salinity, pH, and flow rate are critical factors determine extent of OTC sorption on marine sediment and need to be incorporated in modeling fate and transport of OTC in marine environment." @default.
• W2517733145 created "2016-09-16" @default.
• W2517733145 creator A5033673973 @default.
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• W2517733145 date "2016-12-01" @default.
• W2517733145 modified "2023-10-06" @default.
• W2517733145 title "Adsorption-desorption of oxytetracycline on marine sediments: Kinetics and influencing factors" @default.
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• W2517733145 doi "https://doi.org/10.1016/j.chemosphere.2016.08.100" @default.
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