Dissolved Organic Matter Promotes the Aging Process of Polystyrene Microplastics under Dark and Ultraviolet Light Conditions: The Crucial Role of Reactive Oxygen Species

• DOI: 10.1021/acs.est.2c03309
• Publication Date: 2022-07-06T16:02:12Z
• Authors: Xinran Qiu; Sirui Ma; Jianxiang Zhang; Linchuan Fang; Xuetao Guo; Lingyan Zhu
• Keywords: Polystyrene; Ultraviolet

Microplastics (MPs) interact frequently with dissolved organic matter (DOM) commonly found in the environment, but information on aging behavior of MPs under participation DOM is still lacking. Thus, polystyrene microplastic (PSMP) process was systematically studied by electron paramagnetic resonance spectroscopy, high-performance liquid chromatography, Fourier transform infrared (FTIR) and two-dimensional correlation spectroscopy analyses dark ultraviolet (UV) light conditions. to promote transfer generate reactive oxygen species (ROS) conditions PSMPs, while generating ROS UV more susceptible photoelectrons accelerated PSMPs. However, among four types, fulvic acid (FA) has a significant promoting effect PSMPs than humic acid, which can be attributed stronger conversion ability FA semiquinone radicals. Density functional theory calculations are used describe difference different structures plastics DOM. This study provides necessary theoretical basis for migration groundwater deep surface water.