Insights into the release of triclosan from microplastics in aquatic environment assessed with diffusive gradient in thin-films

文献类型： 外文期刊

第一作者： Liu, Si -Si

作者： Liu, Si -Si;Jia, Yu -Wei;Zhao, Jian-Liang;Ying, Guang-Guo;Chen, Chang -Er;Jia, Yu -Wei;Gao, Yue;Guo, Xiao-Yuan;Sweetman, Andy J.;Xu, Li;Tu, Chen

作者机构：

关键词： Microplastics; Organic pollutants; Diffusive gradients in thin -films; Sorption; Waters

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：9.8； 五年影响因子：9.6 ）

ISSN： 0048-9697

年卷期： 2023 年 882 卷

页码：

收录情况： SCI

摘要： Organic chemicals associated with microplastics (MPs) can be released and thus pose potential risks during weathering processes. However, the thermodynamics and kinetics of their release processes still need to be better understood. Herein, the adsorption and desorption kinetics of triclosan on polystyrene (PS) and polyvinyl chloride (PVC) were investigated by using both batch experiments and diffusive gradients in thin-films (DGT) technique. The pseudo-secondorder model fitted the data best, implying that both intraparticle diffusion and external liquid film diffusion influence the adsorption and desorption processes. DGT continuously accumulated triclosan from MP suspensions but slower than theoretical values, indicating some restrictions to desorption. The DGT-induced fluxes in Soils/Sediment (DIFS) model, employed to interpret DGT data, gave distribution coefficients for labile species (Kdl) of 5000 mL g-1 (PS) and 1000 mL g-1 (PVC) and the corresponding response times (Tc) were 10 s and 1000 s, respectively. Higher Kdl but smaller Tc for PS than PVC showed that more triclosan adsorbed on PS could be rapidly released, while there were some kinetic limitations for triclosan on PVC. A novel finding was that pH and ionic strength individually and interactively affected the supply of triclosan to DGT. This is the first study to quantify interactions of organics with MPs by using DGT, aiding our understanding of MPs' adsorption/desorption behavior in the aquatic environment.

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