Li YingChao, Wang Shuai, Qian Song, Liu Zhijie, Weng Yujing, Zhang Yulong
College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 454000, China.
ACS Omega. 2024 Mar 13;9(12):13509-13521. doi: 10.1021/acsomega.3c08674. eCollection 2024 Mar 26.
With the escalating utilization of plastic products, global attention has been increasingly drawn to environmental pollution and recycling challenges stemming from plastic waste. Against this backdrop, biodegradable plastics have emerged as viable alternatives owing to their sustainability and capacity for biodegradation. Polylactic acid (PLA) presently commands the largest market share among biodegradable plastics, finding extensive application in products such as thin films, medical materials, and biodegradable straws. However, the widespread adoption of PLA is hindered by challenges such as high cost, low recycling rates, and complete degradation to HO and CO in natural conditions. Therefore, it is imperative and time-sensitive to explore solutions for the depolymerization and re/upcycling of PLA waste plastics. This review comprehensively outlines the current landscape of PLA recycling methods, emphasizing the advantages and significance of chemical re/upcycling. The subsequent exploration encompasses recent breakthroughs and technical obstacles inherent in diverse chemical depolymerization methods. Ultimately, this review accentuates the impediments and forthcoming possibilities in the realm of PLA plastics, emphasizing the pursuit of closed-loop recycling and upcycling.
随着塑料制品使用量的不断增加，全球对塑料垃圾造成的环境污染和回收挑战的关注度日益提高。在此背景下，可生物降解塑料因其可持续性和生物降解能力而成为可行的替代品。聚乳酸（PLA）目前在可生物降解塑料中占据最大的市场份额，广泛应用于薄膜、医疗材料和可生物降解吸管等产品中。然而，PLA的广泛应用受到高成本、低回收率以及在自然条件下完全降解为水和二氧化碳等挑战的阻碍。因此，探索PLA废塑料解聚和再/升级回收的解决方案既紧迫又具有时间敏感性。本综述全面概述了PLA回收方法的现状，强调了化学再/升级回收的优势和意义。随后的探索涵盖了各种化学解聚方法中最近的突破和固有的技术障碍。最终，本综述强调了PLA塑料领域的障碍和未来可能性，强调了追求闭环回收和升级回收。
