H^+-型スメクタイトのイオン交換吸着に関する統計熱力学的および実験的検討

概要

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Ion exchange adsorption on H^+-form smectite was investigated on the bases of statistical thermodynamics and electron diffraction. Smectite was converted initialy to H^+-form by electrophoresis. Electron diffraction method showed no differences on the respective unit cell dimensions for both H+-form smectite and raw smectite, which indicates that no removal of octahedral and tetrahedral cations took place in the H+-form smectite. Ion exchange isotherms of H^+-form smectite were obtained by conductmetric method for Na^+, Li^+ and Ca^<++> at 25℃. For exchange adsorption on an energiticaly uniform lattice, isotherm equations were derived: by the use of statistical thermodynamics. The equations closely coinside with the experimental adsorption isotherms. Applying these equations to the experimental datas, the potential energies for the ion exchange adsorption and the interaction energies of ion pairs are obtained. The interaction energies of ion pairs are -1.14kT, -0.69kT and + 1.00kT for Na^+- H^+, Li^+- H^+ and Ca^<++> - H^+ pair, respectively. Calculating the free energies of ion exchange, the state of hydrated H^+ ions in the interlayer space was discussed.
日本粘土学会の論文
1996-09-13