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碳酸和酸促进了Ca-montmorillonite:核化,稳定性和水友性机制

Chenglong Yin^1,2, Jin Huang¹, Shao-Yu Deng¹

¹School of Urban Construction, Zhejiang Shuren University, Hangzhou, China.

Frontiers in chemistry

|September 22, 2025

概括

碳酸 (Na2CO3) 和酸 (Na2SiO3) 通过促进水泥材料的形成来增强Ca-montmorillonite土壤的稳定性. 这些添加剂通过离子吸附和电荷再分配机制显著提高了土壤的强度和稳定性.

科学领域:

地质化学和材料科学材料科学
专注于粘土矿物质的化学相互作用和结构变化.

背景情况:

蒙莫里隆石在催化,环境科学和土木工程方面至关重要.
已知碳酸 (Na2CO3) 和酸 (Na2SiO3) 可以改善Ca-montmorillonite土壤的稳定性.
Na2CO3和Na2SiO3在增强核化,稳定性和水友性方面的微观机制尚未完全理解.

研究的目的:

阐明Na2CO3和Na2SiO3在富含Ca-montmorillonite的粘土土的化学稳定中的微观机制.
研究这些添加剂对分子层面的核化,稳定性和水友性的影响.
为了解这些添加剂与基于的稳定剂的协同作用提供见解.

主要方法:

利用扫描电子显微镜 (SEM) 进行稳定土壤的微结构分析.
使用密度函数理论 (DFT) 计算来确定吸附能量和电子相互作用.
分析了差电荷密度图,以了解离子吸附和化学键.

主要成果:

SEM发现Na2CO3和Na2SiO3促进了水泥和晶体物质的形成,增强了土壤的强度.
DFT的计算显示,酸盐 (SiO3^2-) 和碳酸盐 (CO3^2-) 离子在蒙莫里隆石上具有强烈的负吸附能量,这表明它们具有显著的结合.
这些离子的吸附,以及Ca2+和Na+,抑制了水分子的吸附,影响了水友性和稳定性.

结论:

Na2CO3和Na2SiO3通过促进核和形成稳定晶体结构来增强Ca-montmorillonite的稳定性.
在蒙莫里隆石上,SiO3^2-和CO3^2-的离子吸附,加上电荷再分配,是改善土壤强度和改变水友性的关键.
这些发现解释了Na2CO3和Na2SiO3与石灰结合用于土壤稳定性的优越性能,并提供了它们作用的机制模型.

关键词:

卡蒙特莫里隆尼特 (Ca-montmorillonite) 是一种石头.Na2CO3和Na2SiO3是不同的.以为基础的稳定剂.密度函数理论 (DFT) 是指密度函数理论.土壤稳定土壤稳定稳定和水友性机制的稳定和水友性机制

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