光催化技术在塑料废弃物升级回收中的研究进展

Research progress of photocatalytic technology in upcycling of plastic waste

塑料因其成本效益、便携性、耐久性和多功能性而广为人知,是现代社会中不可或缺的一部分。然而,日益增加的塑料废弃物堆积正在引发全球性的污染危机。近年来,塑料升级回收已成为应对该危机的重要手段,它不仅提供了可持续的解决方案来减轻环境污染,还将塑料废弃物转化为高附加值的产品。光催化技术利用太阳能作为唯一能源驱动塑料升级回收,有望在能量中性的条件下同时实现清洁能源储存、资源可持续性和环境修复。首先简要回顾了光催化技术在塑料转化中的发展历程。其次分析了塑料的光催化降解及在非均相和均相条件下的光催化升级回收机理;从机理角度出发,重点讨论了在2种相态下应用光催化技术升级回收塑料废弃物的最新研究进展。最后,结合催化体系的合理设计和优化、机理探究、塑料升级回收的实际应用及光催化技术的耦合等方面,探讨了塑料光催化升级回收面临的挑战和机遇。期望为推动光催化技术在塑料升级回收的工业化应用,开发更绿色、经济和可持续的塑料升级回收技术提供一定的见解和参考。

Plastics have become an indispensable component of modern society,with the unparalleled merits of cost-effectiveness,portability,durability,and versatility.However,the escalating accumulation of plastic waste is exacerbating a global pollution crisis.In recent years,upcycling plastics has emerged as a crucial strategy to address this crisis,not only offering a sustainable solution to mitigate environmental pollution but also converting plastic waste into high-value-added products.Photocatalytic technology,harnessing solar energy as the sole energy source to drive the upcycling of plastics,holds promise for clean energy storage,simultaneous resource sustainability,and environmental remediation under energy-neutral conditions.This paper provides a concise overview of the history of photocatalysis for plastic conversion,analyzes the mechanism of the photocatalytic degradation of plastics as well as the photocatalytic upcycling in both heterogeneous and homogeneous phases.Then,it focuses on the recent progress in applying photocatalysis to upcycle plastic wastes in two phases through different pathways.Finally,the challenges and opportunities of plastic photocatalytic upcycling are discussed in terms of the rational design and optimization of the catalytic system,mechanistic investigation,practical application,and the coupling of photocatalysis.It aims to offer insights and references to promote the industrial application of photocatalytic technology for plastic upcycling and to develop more eco-friendly,more cost-effective,and sustainable plastic upcycling technologies.