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<p>Chromium is utilized across various industries and is commonly detected in industrial wastewater. Hexavalent chromium (Cr(VI)) is recognized as a hazardous pollutant that poses severe threats to the ecological environment and human health. In this study, a magnetic photocatalyst (BiOI/NiFe@N-CNTs) composed of bismuth oxyiodide (BiOI) and magnetic bamboo-like nitrogen-doped carbon nanotubes encapsulating nickel-iron (NiFe) nanoparticles (NiFe@N-CNTs) was synthesized via a one-step hydrothermal route. Multiple characterization techniques confirmed that BiOI/NiFe@N-CNTs exhibited abundant porous structures and a large specific surface area, attributed to its interconnected nanotube morphology. The composite demonstrated outstanding cathodic photoelectrochemical (PEC) activity and efficient photoelectron transfer capability in the presence of [Fe(CN)₆]³⁻. Leveraging these advantages, a disposable magnetic PEC sensor for Cr(VI) detection was fabricated by modifying screen-printed electrodes (SPEs) with BiOI/NiFe@N-CNTs through magnetic assembly. The developed PEC sensor displayed a wide linear detection range of 0.2 nM to 10.0 µM and a low detection limit (LOD) of 65 pM (S/<i>N</i> = 3). Furthermore, the sensor exhibited satisfactory recoveries, excellent repeatability, favorable selectivity, and high stability in real water samples. With its low cost, small sample volume requirement, and disposability, this magnetic PEC sensor holds great promise as a reliable tool for on-site monitoring of Cr(VI).</p>

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A disposable photoelectrochemical sensor based on magnetic photocatalyst BiOI/NiFe@N-CNTs for the assay of hexavalent chromium

  • 期刊论文

  • 发表日期：

    2026年4月24日

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  • Sushuang Xia,
  • Mingyu Zheng,
  • Chunxiang Li,
  • Xinmei Qian,
  • Keqin Deng

摘要

Chromium is utilized across various industries and is commonly detected in industrial wastewater. Hexavalent chromium (Cr(VI)) is recognized as a hazardous pollutant that poses severe threats to the ecological environment and human health. In this study, a magnetic photocatalyst (BiOI/NiFe@N-CNTs) composed of bismuth oxyiodide (BiOI) and magnetic bamboo-like nitrogen-doped carbon nanotubes encapsulating nickel-iron (NiFe) nanoparticles (NiFe@N-CNTs) was synthesized via a one-step hydrothermal route. Multiple characterization techniques confirmed that BiOI/NiFe@N-CNTs exhibited abundant porous structures and a large specific surface area, attributed to its interconnected nanotube morphology. The composite demonstrated outstanding cathodic photoelectrochemical (PEC) activity and efficient photoelectron transfer capability in the presence of [Fe(CN)₆]³⁻. Leveraging these advantages, a disposable magnetic PEC sensor for Cr(VI) detection was fabricated by modifying screen-printed electrodes (SPEs) with BiOI/NiFe@N-CNTs through magnetic assembly. The developed PEC sensor displayed a wide linear detection range of 0.2 nM to 10.0 µM and a low detection limit (LOD) of 65 pM (S/N = 3). Furthermore, the sensor exhibited satisfactory recoveries, excellent repeatability, favorable selectivity, and high stability in real water samples. With its low cost, small sample volume requirement, and disposability, this magnetic PEC sensor holds great promise as a reliable tool for on-site monitoring of Cr(VI).