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<p>This study presents the development of a bifunctional boron nitride (BN)-based Fe<sub>3</sub>O<sub>4</sub>/CoWO<sub>4</sub> nanocomposite for simultaneous micro solid-phase extraction (mSPE) and photocatalytic degradation of Rhodamine B (RhB). The nanocomposite was synthesized via a microwave-assisted method and characterized using FT-IR, FE-SEM, EDX, XRD, and BET techniques, confirming its high surface area, magnetic properties, and porous structure. For SPME applications, the material demonstrated excellent extraction efficiency under optimized conditions (pH 3.0, 7.5&#xa0;mg adsorbent, 50&#xa0;mL sample volume). The method exhibited high selectivity for RhB in complex matrices, including food, cosmetic, and water samples. As a photocatalyst, the BN/Fe<sub>3</sub>O<sub>4</sub>/CoWO<sub>4</sub> nanocomposite achieved 97.2% degradation of RhB under visible light within 75&#xa0;min, significantly outperforming its individual components due to synergistic effects. The enhanced photocatalytic activity was attributed to the efficient charge separation facilitated by the p–n heterojunction between CoWO<sub>4</sub> and BN, with BN acting as an electron sink to suppress photocarrier recombination.</p> Graphical abstract <p></p>

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Dual-functional boron nitride-based Fe3O4/CoWO4 nanocomposites for micro solid-phase extraction and photocatalytic degradation of Rhodamine B

  • 期刊论文

  • 发表日期：

    2026年4月17日

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  • Özgür Özalp,
  • Furkan Uzcan,
  • Nuray Güy,
  • Mustafa Soylak

摘要

This study presents the development of a bifunctional boron nitride (BN)-based Fe3O4/CoWO4 nanocomposite for simultaneous micro solid-phase extraction (mSPE) and photocatalytic degradation of Rhodamine B (RhB). The nanocomposite was synthesized via a microwave-assisted method and characterized using FT-IR, FE-SEM, EDX, XRD, and BET techniques, confirming its high surface area, magnetic properties, and porous structure. For SPME applications, the material demonstrated excellent extraction efficiency under optimized conditions (pH 3.0, 7.5 mg adsorbent, 50 mL sample volume). The method exhibited high selectivity for RhB in complex matrices, including food, cosmetic, and water samples. As a photocatalyst, the BN/Fe3O4/CoWO4 nanocomposite achieved 97.2% degradation of RhB under visible light within 75 min, significantly outperforming its individual components due to synergistic effects. The enhanced photocatalytic activity was attributed to the efficient charge separation facilitated by the p–n heterojunction between CoWO4 and BN, with BN acting as an electron sink to suppress photocarrier recombination.

Graphical abstract