Adsorption behavior and mechanism of cadmium, copper, and lead on polylactic acid microplastics exposed to ultraviolet light
文献类型： 外文期刊
第一作者： Feng, Fang
作者： Feng, Fang;He, Xue;Huang, Jia;Liu, Guiming;Rong, Sashuang;Yan, Hongyuan;Liu, Wei;Wang, Shutao;Wang, Xinghua;Su, Shiming;Han, Bing
作者机构：
关键词： Polylactic acid; UV aging; Adsorption; Mechanism
期刊名称：JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING （ 影响因子：7.2； 五年影响因子：7.6 ）
ISSN： 2213-2929
年卷期： 2025 年 13 卷 3 期
页码：
收录情况： SCI
摘要： The environmental risk of microplastics (MPs) caused by degradable plastics is an emerging issue in which ultraviolet (UV) radiation plays an important role in affecting the ecological behavior of MPs. This study investigates how UV aging affects the modification of the structural properties of degradable polylactic acid (PLA) MPs and the adsorption-desorption behavior of cadmium (Cd(II)), copper (Cu(II)), and lead (Pb(II)) potentially toxic elements (PTEs) and concludes with a discussion of the adsorption mechanism. Characterization results show that UV aging enhances the specific surface area, electronegativity, oxygen-containing functional groups, and hydrophilicity of PLA. The adsorption experiments showed that the adsorption of Cd(II), Cu(II), and Pb(II) increased by 22.95 %, 17.31 %, and 26.76 % after aging. The pseudo-second-order kinetic and the Freundlich isotherm models could describe the adsorption process more accurately, suggesting that chemisorption and multilayer adsorption were dominant. In addition, environmental factors were also taken into account. There was a pH-dependent effect on the adsorption of Cd(II), Cu(II), and Pb(II), with the highest adsorption capacity at 6, 5.5, and 5. The competition and complexation of NaCl and fulvic acid with PTEs inhibited the adsorption. Analyzing the order of the chain rupture in the UV aging process and the change of functional group to discuss the mechanism of adsorption, showed that electrostatic and complexation plays a main role. This study contributes to the understanding of the UV aging behavior of PLA and its environmental risks.
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