Impact of phase composition on water adsorption on inorganic hybrids “salt/silica”

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• 作者：Larisa G. Gordeeva ; Ivan S. Glaznev ; Elena V. Savchenko ; Vladislav V. Malakhov and Yuri I. Aristov
• 关键词：Composites “ ; salt/silica” ; Mesoporous silica gel ; Inorganic salts ; Surface interaction ; Metal cation adsorption ; Water adsorption
• 刊名：Journal of Colloid and Interface Science
• 出版年：2006
• 出版时间：15 September 2006
• 年：2006
• 卷：301
• 期：2
• 页码：685-691
• 全文大小：177 K

文摘

The effect of a “guest–host” interaction on the phase composition and sorption properties of the composite sorbents “salt in a porous host matrix” has been studied. The matrix was a mesoporous silica of KSK type, while the confined salts were CaCl₂, CuSO₄, MgSO₄, and Na₂SO₄. Both structure and properties of the composites were studied by X-ray diffraction, titration in the pH range of 2–9, differential dissolution, and TG techniques. Chemical interaction between the silica surface and the salt during preparation results in the formation of the salt surface complexes and stabilization of the dispersed salt in two phases, namely, a crystalline phase and an X-ray amorphous phase. The water sorption properties of the composites depend on the phase composition and can be intently modified by using variation of the preparation conditions.