School of Environmental Engineering, Xuzhou University of Technology, Xuzhou, 221018, China.
College of Environment, Hohai University, Nanjing, 210098, China.
Environ Sci Pollut Res Int. 2023 Jan;30(4):10484-10494. doi: 10.1007/s11356-022-22897-x. Epub 2022 Sep 8.
Many aging experiments on microplastics (MPs) have been carried out using UV radiation or strong oxidants. Little attention has been paid to the role of water environmental factors such as dissolved organic matter (DOM). In this study, the role of fulvic acid (FA), the main component of DOM, in the UV-aging process of MPs was explored. MPs aged under UV, and UV along with 0.5 mg/L and 2 mg/L FA, were selected as subjects. The results showed that (1) FA accelerated the aging process of polyethylene (PE). PE aged with FA had a larger specific area (S), with more holes and cracks on the surface. (2) FA enhanced the adsorption capacity of PE. The TC adsorption quantities of 0, 0.5, and 2 mg/L FA-aged PE were 1.100, 1.447, and 1.812 mg/L, respectively. (3) The quantity of TC desorbed by PE increased, whereas the desorption rate decreased as the FA concentration increased. The desorption rates of TC at 0, 0.5, and 2 mg/L FA-aged PE were 25.16%, 22.05%, and 19.52% in water, and 72.10%, 70.36%, and 59.51% in simulated intestinal fluid. This study explored the role of FA in the aging process of MPs. Moreover, research on the aging mechanism of MPs is enriched.
许多关于微塑料 (MPs) 的老化实验都是使用紫外线辐射或强氧化剂进行的。对于水环境因素（如溶解有机质 (DOM)）在 MPs 老化过程中的作用，关注较少。在这项研究中，探索了富里酸 (FA)（DOM 的主要成分）在 MPs 紫外线老化过程中的作用。选择在紫外线和紫外线加 0.5 mg/L 和 2 mg/L FA 下老化的 MPs 作为研究对象。结果表明：(1) FA 加速了聚乙烯 (PE) 的老化过程。有 FA 老化的 PE 具有更大的比表面积 (S)，表面有更多的孔和裂缝。(2) FA 增强了 PE 的吸附能力。0、0.5 和 2 mg/L FA 老化的 PE 的 TC 吸附量分别为 1.100、1.447 和 1.812 mg/L。(3)随着 FA 浓度的增加，PE 上 TC 的解吸量增加，而解吸率降低。在 0、0.5 和 2 mg/L FA 老化的 PE 上，水中 TC 的解吸率分别为 25.16%、22.05%和 19.52%，模拟肠液中的解吸率分别为 72.10%、70.36%和 59.51%。本研究探讨了 FA 在 MPs 老化过程中的作用。此外，丰富了 MPs 老化机制的研究。
