The comparison of adsorption kinetics of polystyrene particles with two polyelectrolytes near the isoelectric points
The comparison of adsorption kinetics of polystyrene particles with two polyelectrolytes near the isoelectric points
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聚苯乙烯颗粒与两种聚电解质在等电点附近的吸附动力学比较
DOI：
10.1016/j.colsurfa.2022.130297
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Adachi Yasuhisa
中科院分区：
文献类型：
--
作者：
Feng Lili;Duan Lifan;Zhuang Yiran;Sugimoto Takuya;Adachi Yasuhisa
微塑料由于其无处不在的环境分布和毒理学特性，被广泛认为是一种新兴的污染物。微塑料颗粒与聚电解质的吸附动力学对于提高微塑料的去除效率至关重要，然而，在等电点附近，聚电解质在颗粒表面的吸附动力学还远远没有得到很好的理解。基于电泳迁移率的测量，研究了高、低电荷密度聚电解质在等电点附近的吸附行为。吸附高电荷密度聚电解质的粒子迁移率在几秒内达到平台，而吸附低电荷密度聚电解质的粒子迁移率大约需要几十秒才能达到零平台。高电荷密度聚电解质的吸附随离子强度的降低而增强，而低电荷密度聚电解质的吸附随离子强度的降低而增强。这些结果将有助于分析微塑料颗粒的絮凝过程。
Microplastics are widely regarded as an emerging pollution owing to ubiquitous environmental distributions and toxicological characteristics. The adsorption kinetics of microplastic particles with polyelectrolytes is vital to improve the removal efficiency of microplastics, however, the adsorption kinetics of polyelectrolytes onto the particle surface is far from well understood near the isoelectric point. The adsorption of high and low charge density polyelectrolytes was investigated near the isoelectric point based on the measurement of the electrophoretic mobility. The mobility of particles adsorbing high charge density polyelectrolytes reaches the plateau in several seconds, whereas low charge density polyelectrolyte takes about dozens of seconds to reach the plateau of zero. The adsorption of high charge density polyelectrolyte is enhanced with the decrease of ionic strength, whereas, low charge density polyelectrolyte demonstrates the opposite tendency against ionic strength. All results will facilitate the analysis of the flocculation process of microplastic particles.