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<p>Fe(II) is a major cation that participates in biogeochemical cycles in diverse ecosystems and serves as a trace element for living organisms. Fe(II) can also become a health hazard when it is either insufficient or overabundant in water sources. Thus, the development of performant, easy-to-use, stable, and inexpensive portable systems is a central technological challenge for the on-site monitoring of free Fe(II) in different aqueous solutions. Here, we aimed to develop a sensitive and robust colorimetric Fe(II) sensor by grafting, via ester bonds, the chromogen xylenol orange (XO) on a support made of recycled waste cotton fabric (WCF). The resulting XO-grafted WCF (xWCF) sensing strip quantified free Fe(II) in tap water, lake water, seawater, and different kinds of wastewater with a limit of detection of only 0.0053&#xa0;mg/L and an accuracy of at least 96%. The xWCF device, with its resistant and sustainable support, was selective for Fe(II) among 16 other metallic and non-metallic ions and was stable for long-term storage. Notably, the xWCF strip could be reused several times for free Fe (II) detection without significant variations in its performance. The high efficiency and unique characteristics of the xWCF Fe(II) sensor make it highly suitable for real-life applications.</p> Graphical abstract <p></p>

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A reusable and highly sensitive colorimetric strip made with a waste cotton support for the detection of free Fe(II) in freshwater, seawater, and wastewater

  • 期刊论文

  • 发表日期：

    2025年2月4日

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  • Xiangyang Jiang,
  • Pier-Luc Tremblay,
  • Jinke Yu,
  • Ziyi Zhao,
  • Mengying Xu,
  • Huan Zhang,
  • Qin Yu,
  • Xiaoman Cui,
  • Yu Liu,
  • Tian Zhang

摘要

Fe(II) is a major cation that participates in biogeochemical cycles in diverse ecosystems and serves as a trace element for living organisms. Fe(II) can also become a health hazard when it is either insufficient or overabundant in water sources. Thus, the development of performant, easy-to-use, stable, and inexpensive portable systems is a central technological challenge for the on-site monitoring of free Fe(II) in different aqueous solutions. Here, we aimed to develop a sensitive and robust colorimetric Fe(II) sensor by grafting, via ester bonds, the chromogen xylenol orange (XO) on a support made of recycled waste cotton fabric (WCF). The resulting XO-grafted WCF (xWCF) sensing strip quantified free Fe(II) in tap water, lake water, seawater, and different kinds of wastewater with a limit of detection of only 0.0053 mg/L and an accuracy of at least 96%. The xWCF device, with its resistant and sustainable support, was selective for Fe(II) among 16 other metallic and non-metallic ions and was stable for long-term storage. Notably, the xWCF strip could be reused several times for free Fe (II) detection without significant variations in its performance. The high efficiency and unique characteristics of the xWCF Fe(II) sensor make it highly suitable for real-life applications.

Graphical abstract