Aging of biodegradable-mulch-derived microplastics reduces their sorption capacity of atrazine

文献类型： 外文期刊

第一作者： Cao, Huihui

作者： Cao, Huihui;Yao, Shi;Bian, Yongrong;Jiang, Xin;Song, Yang;Cao, Huihui;Yao, Shi;Bian, Yongrong;Jiang, Xin;Song, Yang;Xu, Li;Cwielag-Piasecka, Irmina;Song, Yang

作者机构：

关键词： Biodegradable mulch film; Microplastic; Ultraviolet aging; Sorption mechanism; Crystallinity

期刊名称：ENVIRONMENTAL POLLUTION （ 影响因子：8.9； 五年影响因子：9.5 ）

ISSN： 0269-7491

年卷期： 2023 年 331 卷

页码：

收录情况： SCI

摘要： Degradable plastics are gradually regarded as alternatives of conventional, synthetic organic polymers to reduce the plastics or microplastics (MPs) pollution; however, the reports upon environmental risk of degradable plastics are still limited. In order to evaluate the potential vector effect of biodegradable MPs on coexisting contaminants, sorption of atrazine onto pristine and ultraviolet-aged (UV) polybutylene adipate co-terephthalate (PBAT) MPs and polybutylene succinate co-terephthalate (PBST) MPs were investigated. The results showed that, UV aging led to more wrinkles and cracks on the surface, increased homogeneous chains proportion, enhanced hydro-phobicity, and enlarged crystallinity of both MPs. The sorption kinetics of atrazine to MPs fitted well into pseudo-first-order (R2 = 0.809-0.996) and pseudo-second-order (R2 = 0.889-0.994) models. In the concentration range of 0.5-25 mg L-1, the sorption isotherm fitted into linear (R2 = 0.967-0.996) and Freundlich model (R2 = 0.972-0.997), indicating that the absorption partitioning was the dominant sorption mechanism. The partition coefficient (Kd) of atrazine to PBAT-MPs (40.11-66.01 L kg-1) was higher than that of PBST-MPs (34.34-57.96 L kg-1), and the Kd values of both MPs declined for aged MPs. The specific surface area, hydrophobicity, polarity and crystallinity of MPs jointly interpreted the changing sorption capacity of the MPs. In the present study, both aged PBAT-and aged PBST-MPs exhibited lower vector potential to atrazine than pristine MPs, suggesting reduced risk of being a pollutant carrier, which is of great significance for the development of biodegradable plastics.

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