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CTAB-activated Carbon from Peanut Husks for the Removal of Antibiotics and Antibiotic-resistant Bacteria from Water

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Abstract

Peanut husk was used to prepare biochar (PHC) for water treatment. The biochar was modified with cetyltrimethylammonium bromide, CTAB (PHC-CTAB). PHC and PHC-CTAB were used to remove tetracycline (TET), amoxicillin (AMX) and antibiotics-resistant bacteria Escherichia coli from water. The surface properties of the adsorbents were identified using Fourier Transform Infrared (FTIR) spectroscopy, X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), and Elemental Dispersive X-ray technique (EDX), which confirmed the successful incorporation of CTAB into the biochar. The presence of CTAB resulted in increased adsorption capacities for the antibiotics. For tetracycline and amoxicillin, PHC-CTAB showed maximum adsorption capacities of 272 mg/g and 305 mg/g, respectively, whereas PHC had maximum adsorption capacities of 71.8 and 284 mg/g for TET and AMX. The mechanism was studied using adsorption kinetic models, with the results establishing that the adsorption proceeded mainly via physisorption for TET and chemisorption for AMX. PHC-CTAB resulted in the permanent deactivation of antibiotics-resistant Escherichia coli strain E11 (ARE) with 1.5 × 108 cfu/mL removed in 60 min, while PHC had only a temporary effect. When the toxicities of the adsorbents were tested on Lemna minor (duckweed), the results revealed that neither PHC nor PHC-CTAB had any toxic effects on the plant since the adsorbents did not prevent the duckweed from growing. In conclusion, PHC and PHC-CTAB are efficient adsorbents for removing antibiotics and antibiotic-resistant bacteria from water.

Highlights

• Peanut husk biochar (PHC) and CTAB-modified peanut husk biochar (PHC-CTAB) were tested.

• The two adsorbents removed antibiotics and antibiotic-resistant bacteria.

• PHC-CTAB provided the highest removal efficiency for tetracycline and amoxicillin.

• Adsorption capacities of PHC-CTAB for tetracycline and amoxicillin were 272 and 305 mg/g.

• PHC-CTAB had a permanent bactericidal effect on antibiotics-resistant Escherichia coli strain E11.

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Data Availability

The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.

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The authors declare that no funds, grants, or other support were received during the preparation of this manuscript.

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Contributions

Abisola O. Egbedina: Conceptualization, Methodology, Writing—original draft, Formal analysis, Investigation. Chidinma. G Ugwuja: Investigation, Methodology, Formal analysis, Writing—original draft. Peter A. Dare: Investigation. Hassan Sulaiman: Investigation. Bamidele I. Olu-Owolabi: Conceptualization, Supervision, Writing—review & editing, Project administration. Kayode O. Adebowale: Conceptualization, Supervision, Writing—review & editing, Project administration.

Corresponding authors

Correspondence to Abisola O. Egbedina or Chidinma G. Ugwuja.

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Egbedina, A.O., Ugwuja, C.G., Dare, P.A. et al. CTAB-activated Carbon from Peanut Husks for the Removal of Antibiotics and Antibiotic-resistant Bacteria from Water. Environ. Process. 10, 20 (2023). https://doi.org/10.1007/s40710-023-00636-9

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  • DOI: https://doi.org/10.1007/s40710-023-00636-9

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