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Elimination of antibiotics by adsorption on ferromagnetic carbon from aqueous media: regeneration of the spent carbon

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Abstract

The removal of tetracycline (TC) and sulfamethazine (SMZ) by adsorption was carried out using ferromagnetic carbon prepared from coffee residue (FAC).The aim of this study was the highlight of some parameters effect (equilibrium time, initial concentration of the antibiotic, (adsorbent dosage) and pH of the solution) on the adsorption capacity of the carbon. The retention efficiency of both substances is high for the initial concentration of the antibiotic less than 5 mg/L, as 97% and 62% were the yields obtained at a concentration of 5 mg/L. Both systems reached equilibrium at about 120 min and 0.5 g of carbon was the optimal mass. TC was preferentially adsorbed to the carbon than (SMZ) due to its zwitterionic form under the operating conditions used. The removal of (SMZ) was not affected by the medium pH compared to TC which showed better adsorption for acidic pH (3 ≤ pH ≤ 7). The kinetic study for both molecules showed that the kinetic data followed the pseudo-second-order model. Chemical regeneration of two spent carbons using a sodium hydroxide solution at pH = 12 provided significant adsorption capacities after 5successive adsorption–desorption cycles for the first carbon (CMC) and 4 cycles for the second (SMC…).

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Acknowledgements

The authors are thankful to Miss BRADAI and Miss BENAMOR for providing facilities to realise all the solutions analysis. The authors are also grateful to Mr BENIDER and Mr MAMAS to have performed the structural and thermal analyses for the different prepared adsorbents.

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This research received no external funding.

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Correspondence to L. Khenniche.

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This article does not contain any studies with human participants or animals performed by any of the authors.

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Editorial responsibility: Nour Sh. El-Gendy.

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Khenniche, L., Chemache, Z., Saidou-Souleymane, M. et al. Elimination of antibiotics by adsorption on ferromagnetic carbon from aqueous media: regeneration of the spent carbon. Int. J. Environ. Sci. Technol. 19, 9571–9586 (2022). https://doi.org/10.1007/s13762-021-03808-y

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  • DOI: https://doi.org/10.1007/s13762-021-03808-y

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