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A recyclable colorimetric sensor made of waste cotton fabric for the detection of copper ions

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Abstract

A large quantity of waste cotton fabric (WCF) generated every year in the world is either incinerated or buried leading to pollution and resource wastes. Here, in order to develop a recycling avenue for WCF, a simple, easy-to-use, and portable sensor was designed for the colorimetric detection of toxic Cu2+ in water and food. The sensor (WCF-CPZ) was prepared by coating the surface of WCF with the chromogenic copper chelator cuprizone (CPZ). The results showed that the naked-eye detection limit of the WCF-CPZ sensor for Cu2+ in drinking water was 0.5 mg/L. With image analysis by a smartphone, the quantitative limit of detection of the WCF-CPZ sensor was improved to 0.13 mg/L, which is well below the maximum Cu2+ concentration allowed by the World Health Organization in drinking water of 2.0 mg/L. The WCF-CPZ sensor was also successfully employed for the detection of Cu2+ in lake water and milk samples with an accuracy of more than 92%. Moreover, the robust and sustainable WCF support could be stripped and reused multiple times for colorimetric assays without sensitivity losses.

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Acknowledgments

This study was financed by Wuhan University of Technology, the Chinese Thousand Talents Plan, the National Science Foundation of China (no. 32050410284), grant No SKJC-2020-01-004 of the Hainan Yazhou Bay Science and Technology Bureau, and the Shaoxing 330 overseas elites Plan.

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Correspondence to Pier-Luc Tremblay or Tian Zhang.

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Jiang, X., Zhao, Z., Liao, Y. et al. A recyclable colorimetric sensor made of waste cotton fabric for the detection of copper ions. Cellulose 29, 5103–5115 (2022). https://doi.org/10.1007/s10570-022-04572-z

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  • DOI: https://doi.org/10.1007/s10570-022-04572-z

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