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Aggregation characterization and mechanism of microplastics and suspended sand in the Three Gorges Reservoir
Summary
Researchers conducted large-scale flume experiments to characterize aggregation between PMMA and PS microplastics and suspended sediment from the Three Gorges Reservoir under shear flow conditions, finding that heteroaggregation produced larger floc sizes than sediment alone and that PMMA formed aggregates more readily than PS due to greater electron transfer and surface charge changes.
本文依据三峡库区悬沙矿物组成和泥沙级配为依据配置沙样，选择长江上游典型微塑料PMMA和PS，在自制大型水箱中开展水流剪切作用下微塑料和泥沙异质聚集实验，分析微—泥絮团的形态特征和聚集机制。结果表明在水流紊动剪切作用下，相比泥沙同质聚集的絮团粒径，微—泥异质聚集的絮团粒径更大，且每毫升样品中微—泥絮团上的微塑料吸附数量随水流剪切率增大而迅速增加。扫描电镜和能谱分析结果表明，在水动力条件下泥沙与PMMA、PS微球发生异质聚集，聚集过程中存在电子转移和化学态的转变，并产生不饱和键 （C C）。由于PMMA官能团的结合能变化比PS大，此过程失电子更多、表面电荷更大，更容易与泥沙发生聚集。
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