生态学杂志2025，Vol.44Issue(11)：3704-3712,9.DOI:10.13292/j.1000-4890.202511.036
不同来源聚乙烯微塑料的光老化过程
Photoaging process of polyethylene microplastics from different sources
摘要
Abstract
Photoaging is an important transformation process of microplastics(MPs)in the environment.However,the photoaging process of MPs derived from commonly used commercial plastics is unclear.Herein,pure polyethy-lene(PE)polymer(PEs),PE plastic bag(PEb)and agricultural plastic film(PEm)were used as examples to examine changes of physical and chemical properties during photoaging process of MPs.PEb and PEm MPs were prepared by mechanical crushing.The results showed that small pieces of MPs were peeled off from original MPs with the irradiation.Rough surface of PE MPs gradually changed to smooth surface.After irradiation,crystallinity of MPs increased by 6.1％-12.14％.The X-ray photoelectron spectroscopy and Fourier Transform Infrared Spectrome-ter characterization showed that C-O content increased by 0.08-0.125,-OH content increased by 0.016-0.098,carbonyl index increased by 0.06-0.153,and conjugated ketones increased by 0.005-0.081.MPs showed different degrees of photoaging:PEs＞PEb＞PEm.The photoaging was mainly induced by the light absorption of original chro-mophores,which led to bond breakage and photooxidation reaction,and then produced oxidation products such as ketones,carboxylic acids,and esters.The presence of additives caused differences in concentrations of hydroperox-ide products,which are important intermediates in the photoaging process,resulting in different photoaging rates.Our results revealed the differences in photoaging process of PE MPs from different sources,which provided impor-tant information for evaluating ecological risks of PE MPs.关键词
微塑料/光老化机制/商用聚乙烯塑料/光氧化产物/含氧官能团Key words
microplastics/photoaging mechanism/commercial polyethylene plastics/photooxidation product/oxy-gen-containing functional group引用本文复制引用
杨志国,雷蕾,肖文涛,张思玉..不同来源聚乙烯微塑料的光老化过程[J].生态学杂志,2025,44(11):3704-3712,9.基金项目
国家自然科学基金项目(22176196、42022056、42192574、42077394和42277423)、辽宁省自然科学基金(2020-YQ-10)、辽宁省兴辽英才计划项目(XLYC2007124)和广东省科学院发展专项资金(2022GDASZH-2022010105和2020GDASYL-20200101002)资助. （22176196、42022056、42192574、42077394和42277423）
