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A thermodynamic study of cation exchange in montmorillonite clays using solution calorimetry
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A thermodynamic study of cation exchange in montmorillonite clays using solution calorimetry
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Dissertation
A thermodynamic study of cation exchange in montmorillonite clays using solution calorimetry
2009
Overview
The energy change (ΔH) was determined for cation exchange in montmorillonite clay using solution calorimetry to quantify accepted qualitative trends of cation exchange. Five clays were obtained from the Source Clays Repository and included SAz-1, SCa-3, SHCa-1, STx-1, and SWy–2. All clays were exchanged with sodium, potassium, magnesium, calcium, aluminum, and iron. Each heat exchange was measured in calories per gram (cal/g) and average values were determined. The energy change was plotted against known cation exchange capacities (CEC) for each type of clay. Based on these trends, a linear relationship between cation exchange capacity and energy was expected. However, only the potassium clay showed any linearity. Unusual behavior resulted from all other cations and led to consideration of charge origination, solvation properties, pH, surface area, and entropy in order to improve understanding of exchange processes.
Publisher
ProQuest Dissertations & Theses
Subject
ISBN
1109687958, 9781109687958
