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<p>Antibiotic pollution in water systems is a serious environmental threat. Here, nanosorbent α-Fe<sub>2</sub>O<sub>3</sub>–g-C<sub>3</sub>N<sub>4</sub> was synthesized to eliminate oxytetracycline (OC) from polluted water. The properties of the resulting nanostructure were characterized using x-ray diffraction (XRD), x-ray photoelectron spectrometry (XPS), energy-dispersive x-ray technique (EDX), Fourier-transform infrared (FTIR) spectroscopy, and scanning and transmission electron microscopy (SEM, TEM). The development of 44.91-nm α-Fe<sub>2</sub>O<sub>3</sub> nanoparticles and a 7.33-&#xa0;nm&#xa0;g-C<sub>3</sub>N<sub>4</sub> nanostructure was verified by the XRD investigation and the anchoring of the two precursors was confirmed by the FTIR and XPS analyses. The impact of OC concentration, adsorbent loading, pH, and contact time on the adsorption capacity and percentage of organic carbon removal of the nanosorbent were assessed. The adsorption equilibrium data better matched the Freundlich isotherm than both the Temkin and Langmuir models, reaching 373.5&#xa0;mg/g OC removal, whereas the adsorption kinetics fitted both the quasi-first and quasi-second, indicating a blend of physisorption and chemisorption processes for the OC uptake. The mechanistic investigation speculated that the H-bonding and π–π interaction are the main likely attributes to the OC linking to the α-Fe<sub>2</sub>O<sub>3</sub>–g-C<sub>3</sub>N<sub>4</sub> adsorbent. The result of this study proves that α-Fe<sub>2</sub>O<sub>3</sub>–g-C<sub>3</sub>N<sub>4</sub>nanosorbent was successfully synthesized and had an effective role in removing OC from contaminated water.</p> Graphical Abstract <p></p>

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Green α-Fe2O3–g-C3N4 Nanosorbent for Oxytetracycline Eradication from Polluted Water

  • 期刊论文

  • 发表日期：

    2025年7月9日

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  • Tahani M. Alresheedi,
  • Azizah A. Algreiby,
  • Abrar S. Alnafisah,
  • Muneera Alrasheedi,
  • Mukhtar Ismail,
  • Kamal K. Taha,
  • Abueliz Modwi

摘要

Antibiotic pollution in water systems is a serious environmental threat. Here, nanosorbent α-Fe2O3–g-C3N4 was synthesized to eliminate oxytetracycline (OC) from polluted water. The properties of the resulting nanostructure were characterized using x-ray diffraction (XRD), x-ray photoelectron spectrometry (XPS), energy-dispersive x-ray technique (EDX), Fourier-transform infrared (FTIR) spectroscopy, and scanning and transmission electron microscopy (SEM, TEM). The development of 44.91-nm α-Fe2O3 nanoparticles and a 7.33- nm g-C3N4 nanostructure was verified by the XRD investigation and the anchoring of the two precursors was confirmed by the FTIR and XPS analyses. The impact of OC concentration, adsorbent loading, pH, and contact time on the adsorption capacity and percentage of organic carbon removal of the nanosorbent were assessed. The adsorption equilibrium data better matched the Freundlich isotherm than both the Temkin and Langmuir models, reaching 373.5 mg/g OC removal, whereas the adsorption kinetics fitted both the quasi-first and quasi-second, indicating a blend of physisorption and chemisorption processes for the OC uptake. The mechanistic investigation speculated that the H-bonding and π–π interaction are the main likely attributes to the OC linking to the α-Fe2O3–g-C3N4 adsorbent. The result of this study proves that α-Fe2O3–g-C3N4nanosorbent was successfully synthesized and had an effective role in removing OC from contaminated water.

Graphical Abstract