南华大学学报（自然科学版）2025，Vol.39Issue(5)：40-48,9.DOI:10.19431/j.cnki.1673-0062.2025.05.005
水体组分对聚甲基丙烯酸甲酯纳米颗粒聚沉行为的影响
Influence of Water Components on the Aggregation-dispersion and Floating-settling Behavior of Polymethyl Methacrylate Nanoparticles
摘要
Abstract
The aggregation-dispersion and floating-settling behaviors of microplastics in en-vironmental waters arekey factors influencing their migration and distribution in different media.In this study,the effects of three typical water constituents—Na+,Ca2+,and humic acid(HA)—on the dispersion stability and floating-settling efficiency of particles were investigated,using polymethyl methacrylate nanoparticles(PMMA NPs)as the mod-el.Additionally,the aggregation and settling behavior of particles in seven types of water samples,including river,lake,seawater,and domestic sewage,were analyzed.The re-sults indicated that the two metal ions reduced the surface ζ-potential of the NPs to below-15 mV through electrostatic adsorption,which increased the aggregation efficiency of the NPs.At the same time,the relative water body density of the NPs was increased,promo-ting particle settling.The inconsistency of threshold concentrations of metal ions between the aggregation and settling behaviors led to various migration patterns of particles,such as"settle but not aggregate""settle and aggregate"and"aggregate but not settle".HA was found to enhance the dispersion stability and suspension efficiency of NPs,particularly due to the complex interactions involving amino acids-like,proteins-like,and other organic macromolecules in HA,which compete with metal ions for adsorption and complexation on the NPs surface.关键词
聚甲基丙烯酸甲酯(PMMA)/纳米颗粒/团聚-分散/悬浮-沉降/环境水体Key words
polymethyl methacrylate(PMMA)/nanoparticles/aggregation-dispersion/float-ing-settling/environmental waters分类
化学化工引用本文复制引用
丁志坚,汪浩,柳迎春,陈思莉,陈尧,郑卫民..水体组分对聚甲基丙烯酸甲酯纳米颗粒聚沉行为的影响[J].南华大学学报（自然科学版）,2025,39(5):40-48,9.基金项目
国家自然科学基金项目(42207465) （42207465）
广州市基础研究计划项目(SL2023A04J01566) （SL2023A04J01566）
