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<p>The transition to a circular plastics economy is critical for mitigating plastic pollution and advancing global sustainability goals. As one of the most widely used synthetic polymers worldwide, the recycling of polyvinyl chloride (PVC) remains impeded by inefficient dechlorination and toxic chlorinated by-product formation. Here we show that a tailored LaFe<sub>0.3</sub>Al<sub>0.7</sub>O<sub>3</sub> catalyst significantly enhances peroxymonosulfate activation to achieve stepwise PVC depolymerization. This system achieves complete conversion of PVC into CO<sub>2</sub> and liquid organic products. Thus, valuable hydrocarbon compounds are obtained in high yields exceeding 90% among these liquids. Mechanistic studies reveal a cascade process: preferential chlorine removal mediated by singlet oxygen (<sup>1</sup>O<sub>2</sub>) followed by hydroxyl radical (⋅OH)-driven polymer backbone oxidation. The synergistic effect of <sup>1</sup>O<sub>2</sub> and ⋅OH resolves the key challenge of toxic by-products generated during dechlorination. A life-cycle assessment confirms that the process reduces carbon emissions by 45–99% and eco-costs by 51–99% across impact categories compared with conventional PVC waste treatment methods. Our approach enables the conversion of persistent waste plastics into valuable hydrocarbons through a safer and cleaner process with a notably reduced environmental footprints, thus opening opportunities for a more sustainable future.</p>

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Catalytic cascade depolymerization for sustainable recycling of waste polyvinyl chloride

  • 期刊论文

  • 发表日期：

    2025年10月28日

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  • Yueshuang Mao,
  • Pengfei Wang,
  • Ruochen Cao,
  • Ligang Wang,
  • Bingnan Yu,
  • Dongpeng Zhang,
  • Wenfang Gao,
  • Yueping Bao,
  • Ding Ma,
  • Sihui Zhan

摘要

The transition to a circular plastics economy is critical for mitigating plastic pollution and advancing global sustainability goals. As one of the most widely used synthetic polymers worldwide, the recycling of polyvinyl chloride (PVC) remains impeded by inefficient dechlorination and toxic chlorinated by-product formation. Here we show that a tailored LaFe0.3Al0.7O3 catalyst significantly enhances peroxymonosulfate activation to achieve stepwise PVC depolymerization. This system achieves complete conversion of PVC into CO2 and liquid organic products. Thus, valuable hydrocarbon compounds are obtained in high yields exceeding 90% among these liquids. Mechanistic studies reveal a cascade process: preferential chlorine removal mediated by singlet oxygen (1O2) followed by hydroxyl radical (⋅OH)-driven polymer backbone oxidation. The synergistic effect of 1O2 and ⋅OH resolves the key challenge of toxic by-products generated during dechlorination. A life-cycle assessment confirms that the process reduces carbon emissions by 45–99% and eco-costs by 51–99% across impact categories compared with conventional PVC waste treatment methods. Our approach enables the conversion of persistent waste plastics into valuable hydrocarbons through a safer and cleaner process with a notably reduced environmental footprints, thus opening opportunities for a more sustainable future.