School of Environment and Natural Resources, Zhejiang University of Science & Technology, Hangzhou, 310023, China; Institut de Chimie des Milieux et des Matériaux IC2MP UMR 7285 CNRS, Université de Poitiers, France.
Institut de Chimie des Milieux et des Matériaux IC2MP UMR 7285 CNRS, Université de Poitiers, France; Université Paris Cité, Institut de physique du globe de Paris, CNRS, F-75005, Paris, France.
Chemosphere. 2024 Oct;366:143482. doi: 10.1016/j.chemosphere.2024.143482. Epub 2024 Oct 5.
The aggregation of rough, raspberry-type polystyrene nanoparticles (PS-NPs) was investigated in the presence of six hydrophobic and hydrophilic dissolved organic matter (DOM) isolates and biopolymers (effluent OM) in NaCl and CaCl solutions using time-resolved dynamic light scattering. Results showed that the stability of PS-NPs mainly depends on OM characteristics and ionic composition. Due to cation bridging, the aggregation rate of PS-NPs in Ca-containing solutions was significantly higher than at similar Na-ionic strength. Biopolymers rich in protein and carbohydrate moieties showed higher affinity to the surface of PS-NPs than the other DOM isolates in the absence of both Ca and Na. Overall, the stability of PS-NPs followed the order of biopolymers > hydrophobic isolates > hydrophilic isolates in the presence of Na and biopolymers > hydrophilic isolates > hydrophobic isolates in Ca-containing solutions. In the presence of high MW structures (biopolymers), PS-NPs aggregation in both NaCl and CaCl solutions was attributed to steric repulsive forces. The impact of hydrophilic and hydrophobic isolates on PS-NPs aggregation highly relied on the ionic composition. Coagulation was an effective pretreatment for PS-NPs removal. Using inductively coupled plasma-mass spectrometry, higher removals were recorded with Al(SO) in the absence of DOM, while PACl more efficiently coagulated PS-NPs in the presence of DOM isolates.
采用时间分辨动态光散射法研究了在 NaCl 和 CaCl 溶液中六种疏水性和亲水性溶解有机物（DOM）分离物和生物聚合物（出水 OM）存在下，粗糙、覆盆子状聚苯乙烯纳米颗粒（PS-NPs）的聚集情况。结果表明，PS-NPs 的稳定性主要取决于 OM 特性和离子组成。由于阳离子桥接作用，含 Ca 的溶液中 PS-NPs 的聚集速率明显高于具有相似 Na 离子强度的溶液。富含蛋白质和碳水化合物部分的生物聚合物在没有 Ca 和 Na 的情况下，对 PS-NPs 表面的亲和力高于其他 DOM 分离物。总体而言，在 Na 存在下，PS-NPs 的稳定性顺序为生物聚合物>疏水性分离物>亲水性分离物，在含 Ca 的溶液中为生物聚合物>亲水性分离物>疏水性分离物。在高 MW 结构（生物聚合物）存在下，NaCl 和 CaCl 溶液中 PS-NPs 的聚集归因于空间排斥力。亲水和疏水分离物对 PS-NPs 聚集的影响高度依赖于离子组成。混凝是 PS-NPs 去除的有效预处理方法。使用电感耦合等离子体质谱法，在没有 DOM 的情况下，Al(SO)记录到更高的去除率，而在有 DOM 分离物存在的情况下，PACl 更有效地混凝 PS-NPs。
