Photoaging mechanism of microplastics:a perspective on the effect of dissolved organic matter in natural water
作者机构：College of Arts and SciencesNortheast Agricultural UniversityHarbin 150030China Key Laboratory of Water and Sediment Sciences of Ministry of EducationState Key Laboratory of Water Environment SimulationSchool of EnvironmentBeijing Normal UniversityBeijing 100875China Institutional Center for Shared Technologies and FacilitiesInstitute of Genetics and Developmental BiologyChinese Academy of SciencesBeijing100101 China Institute of Analysis and TestingBeijing Academy of Science and TechnologyBeijing Center for Physical&Chemical AnalysisBeijing 100089China
出 版 物：《Frontiers of Environmental Science & Engineering》 (环境科学与工程前沿（英文）)
年 卷 期：2023年第17卷第11期
页 面：287-293页
核心收录：
学科分类：0710[理学-生物学] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 1002[医学-临床医学] 0907[农学-林学] 07[理学] 1001[医学-基础医学(可授医学、理学学位)] 070303[理学-有机化学] 0703[理学-化学] 0836[工学-生物工程] 0713[理学-生态学]
基 金：supported by the Fund for National Key R&D Program of China(No.2021YFC3200401) the National Natural Science Foundation of China(Nos.52170024,21677015,22006031).
主 题：Microplastics Photoaging Dissolved organic matter ROS generation
摘 要：Plastic products widespread in natural water can be broken into smaller-sized microplastics(MPs,5 mm)under light irradiation,thermal degradation and biodegradation,posing a serious threat to aquatic ecosystems and human health.This perspective concludes that MPs can generate reactive oxygen species(ROS)through initiation,propagation and termination steps,which can attack the polymer resulting in the photoaging and breakdown of C–C and C–H bonds under ultraviolet(UV)irradiation.Free radical generation and weathering degree of MPs depend on their physicochemical properties and environmental conditions.In general,UV irradiation and co-existed MPs can significantly accelerate MP photoaging.With plentiful chromophores carbonyl,carboxyl and benzene rings,Dissolved organic matter(DOM)mainly absorbs photons(300–500 nm)and generates hydrated electrons,^(3)DOM^(*) and ROS,which may affect MP photoaging.However,whether DOM may transfer the electron and energy to MPs under UV irradiation,affect ROS generation of MPs and their photoaging pathway are inadequately studied.More studies are needed to elucidate MP photoaging pathways and mechanisms,consider the influence of stabilization capacity,photosensitization and photoionization of DOM as well as their competitive light absorption with MPs,which provides valuable insights into the environmental behavior and ecological risk of MPs in natural water.
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