CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research (YIC), Chinese Academy of Sciences (CAS); Shandong Key Laboratory of Coastal Environmental Processes, YICCAS, Yantai, 264003, PR China; Center for Ocean Mega-Science, Chinese Academy of Sciences,7 Nanhai Road, Qingdao, 266071, PR China.
CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research (YIC), Chinese Academy of Sciences (CAS); Shandong Key Laboratory of Coastal Environmental Processes, YICCAS, Yantai, 264003, PR China.
Chemosphere. 2023 Jan;311(Pt 1):137032. doi: 10.1016/j.chemosphere.2022.137032. Epub 2022 Oct 27.
Microplastics widely exist in diverse matrices to become important hosts of pollutants. Little information regarding adsorption of emerging contaminants on coastal saline soils influenced by co-existing microplastics is available. Thus, the adsorption behaviors of nonylphenol (NP) on coastal saline soil influenced by microplastics were discussed. Polyvinyl chloride (PVC, 4.7 mm), polyethylene (4.85 mm), and polypropylene (4.51 mm) with addition dose of 10% were used to discuss the effect of microplastic type on adsorption of NP by coastal saline soil while PVC samples with size of 4.7 mm and 0.11 mm were used to explore the effect of microplastic size on NP adsorption. The NP adsorption capacity of the saline soil containing 10% of PVC (4.7 mm) was twice that of soil without PVC. Smaller-size PVC (0.11 mm) with addition amount of 10% enhanced the NP adsorption capacity of the coastal saline soil by 117% to reach 8.91 μg g. The desorption capacity of NP on saline soil decreased from 40% to 30% of total adsorption capacity with co-existing PVC. Adsorption/desorption kinetics of NP on coastal saline soil with PVC microplastics could be well explained by pseudo second order model while Freundlich model could better fit the isotherm data of NP adsorption/desorption to show possible occurrence of the multiple-layer adsorption. This study will provide new information regarding the environmental behaviors of typical emerging contaminants on coastal saline soil containing microplastics.
微塑料广泛存在于各种基质中，成为污染物的重要载体。关于共存微塑料对沿海盐渍土中新兴污染物吸附的信息很少。因此，讨论了受微塑料影响的沿海盐渍土中壬基酚（NP）的吸附行为。使用添加量为 10%的聚氯乙烯（PVC，4.7mm）、聚乙烯（4.85mm）和聚丙烯（4.51mm）来讨论微塑料类型对沿海盐渍土中 NP 吸附的影响，而使用尺寸为 4.7mm 和 0.11mm 的 PVC 样品来研究微塑料尺寸对 NP 吸附的影响。含有 10%聚氯乙烯（4.7mm）的盐渍土对 NP 的吸附容量是不含聚氯乙烯土的两倍。添加量为 10%的较小尺寸 PVC（0.11mm）使沿海盐渍土的 NP 吸附容量增加了 117%，达到 8.91μg/g。共存 PVC 会使 NP 在盐渍土上的解吸能力从总吸附容量的 40%下降到 30%。NP 在含 PVC 微塑料的沿海盐渍土上的吸附/解吸动力学可以很好地用拟二级模型来解释，而 Freundlich 模型可以更好地拟合 NP 吸附/解吸的等温线数据，表明可能发生多层吸附。本研究将为含有微塑料的典型新兴污染物在沿海盐渍土中的环境行为提供新的信息。
