文献类型：期刊文献

中文题名：废弃聚对苯二甲酸乙二醇酯化学升级回收研究进展

英文题名：Research progress on chemical upcycling of waste polyethylene terephthalate

作者：戴瑞红[1,2];林航青[3];詹佳慧[1];丛容非[3];罗虎[1];魏雪梅[4];夏林[1];王慧[1,3]

机构：[1]中国科学院上海高等研究院,低碳转化科学与工程中心,上海201210;[2]中国科学院大学,北京100049;[3]上海科技大学物质科学与技术学院,上海201210;[4]脂溶性维生素浙江省工程研究中心(绍兴文理学院),绍兴312000

年份：2025

卷号：70

期号：18

起止页码：2825

中文期刊名：科学通报

外文期刊名：Chinese Science Bulletin

收录：北大核心2023、、ESCI(收录号：WOS:001513144300004)、EI(收录号：20252418617799)、WOS、北大核心

基金：国家自然科学基金(22478409,22108289,22279158,22308215);国家重点研发计划(2022YFA1504800);脂溶性维生素浙江省工程中心开放基金(202302)资助。

语种：中文

中文关键词：聚对苯二甲酸乙二醇酯;化学升级;催化剂;反应机理

外文关键词：polyethylene terephthalate(PET);chemical upcycling;catalyst;reaction mechanism

中文摘要：塑料的工业生产为人们日常生活带来了极大便利,然而,快速增加的废弃塑料对生态环境造成了巨大压力,使得废塑料的回收利用成为全球关注的热点.聚对苯二甲酸乙二醇酯(PET)是一种性能优异的热塑性聚酯材料,广泛应用于纺织、包装、电子器件等行业.目前,废弃PET化学回收主要采用水解与醇解等方法,将其转化为单体或低聚物等用于合成新的PET或其他高附加值化学品.在此基础上,本文综述了近年来PET热解、水解、醇解、氢解、光/电催化、微波强化等化学升级回收的研究进展,介绍了产物选择性调控的反应机理,分析了各类方法面临的挑战并展望了未来PET化学升级回收的发展方向,旨在为开发高效的工业回收技术提供技术参考,推动塑料循环经济的发展.

外文摘要：The industrial production of plastics has greatly enhanced our daily life,but the rapid accumulation in waste plastics now places immense pressure on the ecological environment,making recycling and reuse a global priority.Polyethylene terephthalate(PET)is an excellent thermoplastic polyester,which is widely used in textiles,packaging,electronic devices,and other industries.Currently,chemical recycling of waste PET primarily involves hydrolysis and alcoholysis,converting it into monomers or oligomers that can be used to synthesize new PET or other high-value chemicals.This review summarizes and analyzes recent advancements in the pyrolysis,hydrolysis,alcoholysis,and hydrogenolysis of PET,aiming to elucidate the reaction mechanisms that govern product selectivity.PET pyrolysis involves the breaking down of PET into small molecular products,such as acids,esters,ketones,and aromatics under oxygen-free or oxygen-deficient conditions with high-temperature heating.The product composition is influenced by the choice of catalysts.PET hydrolysis can be classified into acidic hydrolysis,alkaline hydrolysis,and neutral hydrolysis based on the pH of the aqueous phase.OH?or H 2O acts as a nucleophile to attack the ester bonds,facilitating PET depolymerization into terephthalic acid(TPA)and ethylene glycol(EG).The reaction process of PET hydrolysis is mainly controlled by increasing the concentration of OH?or H+.PET alcoholysis is typically conducted in methanol and ethylene glycol,with acidic sites influencing the reaction pathway.Under high temperature and acid-base catalysis,PET undergoes ester exchange reactions,breaking the polymer’s ester bonds,and ultimately converting it into dimethyl terephthalate(DMT)or bis(2-hydroxyethyl)terephthalate(BHET).PET hydrogenolysis,on the other hand,involves breaking the ester bonds of PET using H 2 to produce short-chain saturated hydrocarbons(such as benzene,toluene,and xylene(BTX)).The catalytic active centers are designed and optimized to enhance the efficiency of PET hydrogenolysis.Additionally,this review explores photocatalytic,electrocatalytic and microwave-assisted depolymerization of PET to improve the product selectivity.Photocatalysis is a clean,emerging catalytic method in which semiconductor catalysts generate photogenerated electrons and photogenerated holes under light excitation.The photogenerated electrons are excited from the valence band to the conduction band,enabling reduction reactions(such as reducing H 2O to H 2),while the holes in the valence band oxidize plastics into valuable small organic molecules.This approach enables mild plastics degradation.PET electrocatalytic upgrading includes processes like the PET hydrolysis and the oxidation of product ethylene glycol to high-value chemicals(such as terephthalic acid,formate,and glycolate).These processes include complex cascade reactions that produce various C 1/C 2 products depending on the catalyst used.Microwave-assisted depolymerization leverages the selective heating properties of microwaves,activating polar chemical bonds and reducing the activation energy of the reaction.Besides,this process enhances PET depolymerization,shortens reaction times and generates high-value products under mild conditions,supports the circular economy goals.This review also summarizes the difficulties and challenges associated with various recycling methods and outlines the future directions for PET chemical upcycling.The development of efficient catalysts and in-depth exploration of reaction mechanisms to control product selectivity is recommended to advance the understanding of PET selective depolymerization process.Integrating new technologies,such as microwave-assisted processes and photo/electrocatalysis,could further enhance the reaction rates and efficiency at mild reaction conditions,which accelerates their application in real waste plastic scenarios.This review provides technical references for advancing the industrial recycling technologies and promotes the progress in plastic waste upcycling.