Influence of electrolyte metal ions, shear force, and temperature on the environmental fate and behavior of humic acid colloids

IF 2.2 4区化学 Q3 CHEMISTRY, PHYSICAL

Colloid and Polymer Science Pub Date : 2024-12-31 DOI:10.1007/s00396-024-05365-5

Liqiang Tan, Xingao Hu, Guiping Chen, Song Wang, Yuxiang Wang, Caijin Wu

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Abstract

The fate and migration behavior of humic acid (HA) colloids in the natural environmental system is affected by numerous factors. This work investigated the effect of metal ions, shear force, and temperature on the aggregation behavior of HA colloids by using dynamic light scattering and fluorescence measurements. Experimental results indicated that the presence of electrolyte cations in the reaction system could decrease electrostatic repulsion and form intermolecular interactions between HA molecules, thus inducing a fast aggregation of HA colloids. A relatively small shear force could facilitate the formation of HA aggregates by enhancing the efficiency of intermolecular collisions, while a high shear force could break the large aggregates into smaller particles. With the increase of the water temperature, HA colloids aggregated aggressively due to the enhanced random Brownian motion of the particles. However, large aggregates formed at higher temperatures disaggregated rapidly due to the enhanced Brownian motion and thermal kinetic energy of water molecules. These results help us to generate hypotheses to guide further studies on the environmental behavior characteristics of HA colloids.

Graphical Abstract

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电解质金属离子、剪切力和温度对腐植酸胶体环境命运和行为的影响

腐植酸（HA）胶体在自然环境系统中的命运和迁移行为受多种因素的影响。本文通过动态光散射和荧光测量研究了金属离子、剪切力和温度对透明质酸胶体聚集行为的影响。实验结果表明，在反应体系中存在电解质阳离子，可以降低HA分子间的静电斥力，形成HA分子间的相互作用，从而诱导HA胶体快速聚集。相对较小的剪切力可以通过提高分子间碰撞的效率来促进HA聚集体的形成，而较大的剪切力可以将大的聚集体破碎成较小的颗粒。随着水温的升高，由于粒子的随机布朗运动增强，HA胶体的聚集性增强。然而，由于水分子的布朗运动和热动能增强，在较高温度下形成的大聚集体迅速分解。这些结果有助于我们产生假设，以指导进一步研究透明质酸胶体的环境行为特征。图形抽象

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来源期刊

Colloid and Polymer Science 化学-高分子科学

CiteScore

4.60

自引率

4.20%

发文量

111

审稿时长

2.2 months

期刊介绍： Colloid and Polymer Science - a leading international journal of longstanding tradition - is devoted to colloid and polymer science and its interdisciplinary interactions. As such, it responds to a demand which has lost none of its actuality as revealed in the trends of contemporary materials science.