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<p>Although polylactic acid is a promising biodegradable plastic, its slow degradation under natural conditions, microplastic formation, and CO<sub>2</sub> emissions during decomposition undermine its sustainability. Photoreforming offers a promising strategy for polylactic acid conversion; however, current methods suffer from sluggish kinetics&#xa0;and low selectivity. Here, we design a Ni single-atom catalyst anchored on CdS (Ni/CdS) to enable alkali-free photoreforming of real polylactic acid plastic waste under mild conditions. Ni single atom sites facilitate sequential cleavage of α-OH and C<sub>α</sub>-H bonds, enabling efficient H<sub>2</sub> evolution and significantly improving the yield and selectivity of polylactic acid conversion to H<sub>2</sub> and pyruvic acid, achieving an apparent quantum efficiency of 46%. Furthermore, we successfully scaled up the synthesis of Ni/CdS and implemented a square-meter-scale reaction system, demonstrating stable outdoor photoreforming of real polylactic acid plastic waste under sunlight. This work paves a promising pathway for solar-driven upcycling of polylactic acid plastic waste.</p>

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Isolated Ni atoms enable alkali-free photoreforming of waste polylactic acid plastic

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年12月3日

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  • Miao Hu,
  • Chengyang Feng,
  • Jumanah Alharbi,
  • Shouwei Zuo,
  • Viko Ladelta,
  • Ghassan S. Alshehry,
  • Khalid Ruwaili,
  • Hassan S. Al Qahtani,
  • Deyan Luan,
  • Wan-Lu Li,
  • Nikos Hadjichristidis,
  • Huabin Zhang

摘要

Although polylactic acid is a promising biodegradable plastic, its slow degradation under natural conditions, microplastic formation, and CO2 emissions during decomposition undermine its sustainability. Photoreforming offers a promising strategy for polylactic acid conversion; however, current methods suffer from sluggish kinetics and low selectivity. Here, we design a Ni single-atom catalyst anchored on CdS (Ni/CdS) to enable alkali-free photoreforming of real polylactic acid plastic waste under mild conditions. Ni single atom sites facilitate sequential cleavage of α-OH and Cα-H bonds, enabling efficient H2 evolution and significantly improving the yield and selectivity of polylactic acid conversion to H2 and pyruvic acid, achieving an apparent quantum efficiency of 46%. Furthermore, we successfully scaled up the synthesis of Ni/CdS and implemented a square-meter-scale reaction system, demonstrating stable outdoor photoreforming of real polylactic acid plastic waste under sunlight. This work paves a promising pathway for solar-driven upcycling of polylactic acid plastic waste.