Water Vapor Isotherms and Heat of Immersion of Na/Ca-Montmorillonite Systems—I: Homoionic Clay

Water Vapor Isotherms and Heat of Immersion of Na/Ca-Montmorillonite Systems—I: Homoionic Clay
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Na/Ca-蒙脱石体系的水蒸气等温线和浸泡热—I：均离子粘土

DOI：
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发表时间：
1975
期刊：
影响因子：
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通讯作者：
I. Shainberg
I. Shainberg
中科院分区：
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文献类型：
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作者：
R. Keren;I. Shainberg

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测定了25℃、不同相对湿度下钠、钙蒙脱石对水蒸气的吸附等温线、c间距和水浸泡热。吸水量是相对湿度的函数。逐渐增加，而c间距增加，浸泡热(每摩尔吸附水)逐步降低。用BET方程等温线计算的热与离子-偶极模型计算的热符合得很好。提出了一个描述钠钙蒙脱石水化的模型。
Adsorption isotherms for water vapor, c-spacing and heat of immersion in water of Na- and Ca-montmorillonite were measured at 25°C at various r.h. The amount of water adsorbed as a function of the r.h. increased gradually, whereas the c-spacing increased, and the heat of immersion (per mole of adsorbed water) decreased in steps. There was good agreement between the calorimetric data, the heat calculated from the isotherms by use of BET equation, and the calculations from the ion-dipole model. A model is presented to describe the hydration of sodium and calcium montmorillonite.