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聚乙胺-230在膨胀性粘土和结构性质的吸附研究

Yu Qiu^1,2, Zheng Lu^1,3, Tingzhou Yan⁴

¹State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China.

Materials (Basel, Switzerland)

|January 11, 2024

概括

聚乙胺 (PEA) 通过吸附在粘土颗粒上,有效地抑制了粘土膨胀. 这项研究详细介绍了不同粘土上的PEA吸附机制,揭示了离子交换和物理吸附在降低水亲和力方面发挥着关键作用.

科学领域:

地质技术工程地质技术工程
材料科学材料科学材料科学
表面化学表面化学

背景情况:

像蒙莫里隆石 (Mt) 这样的膨胀性粘土由于水相互作用和膨胀而带来工程挑战.
聚乙胺 (PEA) 被用作胀抑制剂来缓解这些问题.

研究的目的:

研究PEA在Na-Mt,Ca-Mt和工程膨胀土壤上的吸附和脱附特性.
阐明控制PEA吸附的机制及其对粘土-水相互作用的影响.

主要方法:

吸附动力学和异热学研究使用伪二阶和兰木尔/弗朗德利希模型.
对Na+和Ca2+的离子交换能力分析.
用X射线衍射 (XRD) 和富里叶变换红外光谱 (FTIR) 来进行结构分析.
测量泽塔电位以评估表面特性.

主要成果:

PEA吸附遵循两阶段和伪二阶段的动力学.
与Na-Mt具有强烈的离子交换,与Ca-Mt具有有限的离子交换;质子和非质子PEA都有助于吸附.
兰木尔模型最好地描述了等热体;离子交换在低度占主导地位,物理吸附在高度的Ca-Mt和膨胀土壤中占主导地位.
XRD显示PEA间隔,阻碍了间层水分;FTIR显示减少吸附的水.
粘土-PEA复合材料显示水的亲和力和表面潜力下降,抑制分散.

结论:

通过离子交换和物理吸附,PEA有效地吸附到膨胀性粘土上,其机制因粘土类型而异.
PEA间隔和减少吸附的水是抑制粘土胀的关键.
粘土-PEA复合材料表现出降低水分和提高稳定性,为广的土壤工程提供解决方案.

关键词:

吸附吸附是一种吸附.离子离子是一种离子.这是一种蒙特莫里隆石 (Montmorillonite).聚胺聚乙胺的使用方法结构结构结构结构炎症抑制剂炎症抑制剂

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