蒙脱石
聚丙烯酰胺
吸附
化学
石英晶体微天平
阳离子聚合
化学工程
离子键合
离子强度
高分子化学
有机化学
离子
水溶液
工程类
作者
Xiaomin Ma,Xun Sun,Ming Wei Chang,Qingxia Liu,Xianshu Dong,Xianshu Dong,Ruxia Chen
出处
期刊:Molecules
[MDPI AG]
日期:2023-05-29
卷期号:28 (11): 4417-4417
被引量:4
标识
DOI:10.3390/molecules28114417
摘要
This study investigates the interaction between montmorillonite and polyacrylamide (PAM) with different ionic types using quartz crystal microbalance with dissipation monitoring (QCM-D) and molecular dynamics (MD) simulations. The goal was to understand the effect of ionicity and ionic type on polymer deposition on montmorillonite surfaces. The results of the QCM-D analysis showed that a decrease in pH led to an increase in the adsorption of montmorillonite on the alumina surface. The ranking of adsorption mass on alumina and pre-adsorbed montmorillonite alumina surfaces was found to be cationic polyacrylamide (CPAM) > polyacrylamide (NPAM) > anionic polyacrylamide (APAM). The study also found that CPAM had the strongest bridging effect on montmorillonite nanoparticles, followed by NPAM, while APAM had a negligible bridging effect. The MD simulations showed that ionicity had a significant influence on the adsorption of polyacrylamides. The cationic functional group N(CH3)3+ had the strongest attraction interaction with the montmorillonite surface, followed by the hydrogen bonding interaction of the amide functional group CONH2, and the anionic functional group COO- had a repulsive interaction. The results suggest that at high ionicity levels, CPAM can be adsorbed on the montmorillonite surface, while at low ionicity levels, APAM may still be adsorbed with a strong coordination trend.
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