【摘要】 光老化是微塑料(MPs)不可忽视的环境行为。基于Web of Science与中国知网中51篇关于MPs老化特征的文献，综述了MPs光老化机理及表面变化特征，评述了模拟与自然老化的差异。聚合物因吸收高能紫外线而引发链反应，是促使MPs光老化并出现表面粗糙和裂痕、增大结晶度、加速表面氧化并提高亲水性的主要原因。模拟加速光老化过于剧烈且羰基化指数评价不确定性较高，亟待构建多指标光老化评估体系，为准确评估MPs环境行为与新污染物防治提供科学依据。更多还原

【Abstract】 Photoaging is an environmental behavior that microplastics(MPs) cannot ignore. Based on a review of 51 literatures on microplastic aging characteristics from Web of Science and China National Knowledge Infrastructure databases, the photoaging mechanism and surface changes of microplastic were explored, and the simulated and natural aging processes were critically compared. Polymers undergo chain reactions due to the absorption of high-energy ultraviolet radiation, which is the main reason for the photoaging of MPs, resulting in surface roughness and cracks, increased crystallinity, accelerated surface oxidation and improved hydrophilicity. The simulation of accelerated photoaging is too severe and the evaluation uncertainty of carbonylation index is high. It is urgent to construct a multi index photoaging evaluation system to provide scientific basis for accurately evaluating the environmental behavior of MPs and the prevention and control of emerging pollutants.更多还原