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<p>A simple, fast, and cost-effective colorimetric nitrite (NO<sub>2</sub><sup>−</sup>)&#xa0;sensor based on ZIF-67-derived Co<sub>3</sub>O<sub>4</sub> nanocomposite (ZCo-2 NC) structure&#xa0;has been developed. The prepared colorimetric sensor (ZCo-2 NC) was employed to sensitively detect NO<sub>2</sub><sup>−</sup> in drinking water system by the exhibition of promising peroxidase-mimicking nanozyme-like features. The sensor manifest well-determined sensing response with excellent linear and wide range of NO<sub>2</sub><sup>−</sup> sensitivity (0.001–0.810&#xa0;μM). The lower detection-limit (LOD) and lower quantification-limit (LOQ) were 0.14 ± 0.05&#xa0;nM and 0.72 ± 0.05&#xa0;nM, respectively, which is far below the US-EPA limit (21.7&#xa0;μM). Further, the sensor also&#xa0;provides&#xa0;strong selectivity response to NO<sub>2</sub><sup>−</sup>, better reversibility (12 cycles), and commendable stability of 10&#xa0;weeks. In addition, it also perceived astonishing practicality towards NO<sub>2</sub><sup>−</sup> in real water samples. Thus, this study opens a new pathway for the sensitive detection of NO<sub>2</sub><sup>−</sup> in drinking water for future endeavor.</p> Graphical abstract <p></p>

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Rational designing of ZIF-67-derived Co3O4 nanocomposite with hierarchical porous structure and extensive peroxidase mimetic activities for highly sensitive colorimetric detection of nitrite in drinking water

  • 期刊论文

  • 发表日期：

    2025年1月9日

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  • Mohib Ullah,
  • Madeeha Arshad,
  • Calvin R. Wei,
  • Gaurav Sanghvi,
  • Suhas Ballal,
  • Rishiv Kalia,
  • Vineet Tirth,
  • Ali Algahtani,
  • Li Zhengxin

摘要

A simple, fast, and cost-effective colorimetric nitrite (NO2−) sensor based on ZIF-67-derived Co3O4 nanocomposite (ZCo-2 NC) structure has been developed. The prepared colorimetric sensor (ZCo-2 NC) was employed to sensitively detect NO2− in drinking water system by the exhibition of promising peroxidase-mimicking nanozyme-like features. The sensor manifest well-determined sensing response with excellent linear and wide range of NO2− sensitivity (0.001–0.810 μM). The lower detection-limit (LOD) and lower quantification-limit (LOQ) were 0.14 ± 0.05 nM and 0.72 ± 0.05 nM, respectively, which is far below the US-EPA limit (21.7 μM). Further, the sensor also provides strong selectivity response to NO2−, better reversibility (12 cycles), and commendable stability of 10 weeks. In addition, it also perceived astonishing practicality towards NO2− in real water samples. Thus, this study opens a new pathway for the sensitive detection of NO2− in drinking water for future endeavor.

Graphical abstract