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Bridging Plastic Recycling and Organic Catalysis: Photocatalytic Deconstruction of Polystyrene via a C–H Oxidation Pathway
ACS Catalysis ( IF 12.9 ) Pub Date : 2022-06-23 , DOI: 10.1021/acscatal.2c02292
Tengfei Li 1, 2 , Arjun Vijeta 1 , Carla Casadevall 1 , Alexander S Gentleman 3 , Tijmen Euser 3 , Erwin Reisner 1
Affiliation  

Chemical recycling of synthetic polymers represents a promising strategy to deconstruct plastic waste and make valuable products. Inspired by small-molecule C–H bond activation, a visible-light-driven reaction is developed to deconstruct polystyrene (PS) into ∼40% benzoic acid as well as ∼20% other monomeric aromatic products at 50 °C and ambient pressure. The practicality of this strategy is demonstrated by deconstruction of real-world PS foam on a gram scale. The reaction is proposed to proceed via a C–H bond oxidation pathway, which is supported by theoretical calculations and experimental results. Fluorescence quenching experiments also support efficient electron transfer between the photocatalyst and the polymer substrate, providing further evidence for the proposed mechanism. This study introduces concepts from small-molecule catalysis to polymer deconstruction and provides a promising method to tackle the global crisis of plastic pollution.

中文翻译:

桥接塑料回收和有机催化:通过 C-H 氧化途径光催化解构聚苯乙烯

合成聚合物的化学回收是一种很有前途的策略,可以解构塑料废物并制造有价值的产品。受小分子 C-H 键活化的启发,开发了一种可见光驱动的反应,可在 50 °C 和环境压力下将聚苯乙烯 (PS) 解构为约 40% 的苯甲酸以及约 20% 的其他单体芳烃产物。这种策略的实用性通过以克级解构现实世界的 PS 泡沫来证明。该反应被提议通过 C-H 键氧化途径进行,这得到了理论计算和实验结果的支持。荧光猝灭实验还支持光催化剂和聚合物基材之间的有效电子转移,为所提出的机制提供了进一步的证据。
更新日期:2022-06-23
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