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<p>Low-entropy non-depolymerizing upcycling of waste plastics into value-added products is promising, as it can avoid energy-intensive depolymerization process. Here, we report a mechanochemical approach for the direct functionalization of plastics with polyoxometalate (POM) molecules. The resulting POM-plastic composites retain integrated plastic chains and exhibit strong potential for NO<sub>2</sub> sensing. Among the composites, phosphotungstic acid/polyethylene terephthalate (PW<sub>12</sub>-PET) achieves a low limit of detection (10.52 ppb) and fast response/recovery times (19.2 s/13.5 s at 5.0 ppm), and shows practical applicability after device assembly. Moreover, it exhibits high selectivity against ten interfering gases. Mechanistic studies reveal that PET transfers multiple charges to PW<sub>12</sub>. It not only activates new bridge-oxygen sites on PW<sub>12</sub> but also maintains a moderate adsorption strength, enabling rapid NO<sub>2</sub> response. This work represents a promising example of direct non-depolymerizing upcycling of waste plastics into value-added functional materials.</p>

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Mechanochemically functionalized waste plastics for NO2 sensing

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年4月25日

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  • Yingnan Zhao,
  • Liang Pang,
  • Zhao Zhao,
  • Hang Shi,
  • Renquan Guan,
  • Zhongling Lang,
  • Ruiqi Yao,
  • Tonghui Wang,
  • Zhimin Ao,
  • Huaqiao Tan,
  • Gao-Feng Han,
  • Xing-You Lang,
  • Qing Jiang

摘要

Low-entropy non-depolymerizing upcycling of waste plastics into value-added products is promising, as it can avoid energy-intensive depolymerization process. Here, we report a mechanochemical approach for the direct functionalization of plastics with polyoxometalate (POM) molecules. The resulting POM-plastic composites retain integrated plastic chains and exhibit strong potential for NO2 sensing. Among the composites, phosphotungstic acid/polyethylene terephthalate (PW12-PET) achieves a low limit of detection (10.52 ppb) and fast response/recovery times (19.2 s/13.5 s at 5.0 ppm), and shows practical applicability after device assembly. Moreover, it exhibits high selectivity against ten interfering gases. Mechanistic studies reveal that PET transfers multiple charges to PW12. It not only activates new bridge-oxygen sites on PW12 but also maintains a moderate adsorption strength, enabling rapid NO2 response. This work represents a promising example of direct non-depolymerizing upcycling of waste plastics into value-added functional materials.