Quantitative Spectroscopic Analysis of Water Populations in the Hydrated Nanopore Environments of a Natural Montmorillonite
Quantitative Spectroscopic Analysis of Water Populations in the Hydrated Nanopore Environments of a Natural Montmorillonite
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DOI：
10.1021/acs.jpcc.1c05462
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发表时间：
2021-12-09
影响因子：
3.7
通讯作者：
Aristilde, Ludmilla
中科院分区：
文献类型：
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作者：
Kelch, Sabrina E.;Youngman, Randall E.;Aristilde, Ludmilla
蒙皂石粘土与自然和工程过程中的溶质捕获有关。本文评价了Na-23固体核磁共振(核磁共振)和热重分析-串联质谱仪(TGA-MS)在不同相对湿度(RH)下平衡的水合天然钠蒙脱石的定量分析。用X射线衍射法测定了在93%和75%RH时，以大尺寸(约1.55 nm)为主的夹层，在55%RH时，中尺寸(类似1.23 nm)与大尺寸夹层的比例为2：1，小尺寸(类似1.23 nm)的比例为2：1。
Smectite clays are implicated in solute trapping in natural and engineered processes. Here we evaluated Na-23 solid-state nuclear magnetic resonance (NMR) and thermogravimetric analysis-coupled mass spectrometry (TGA-MS) for quantitative analysis of a hydrated natural Na-montmorillonite equilibrated at different relative humidity (RH). Using X-ray diffraction, we determined predominantly large-sized (similar to 1.55 nm) interlayers at 93% and 75% RH, 2:1 ratio of medium-sized (similar to 1.23 nm) to large-sized interlayers at 55% RH, and 2:1 ratio of small-sized (