Adsorption of Water on Cation Supported Layer Silicates

[摘要] The adsorptions of gaseous H2O and D2O on Na+-, Ca2+-, and Al3+ montmorillonites at various temperatures were undertaken. Break down of ir hydroxyl stretching bands into four Gaussian components was made by means of manual technique. Resonance theory of water to form silanol hydroxyl group was supported by 3625 cm-1 band for OH and 2680 cm-1 band for OD which depend on amounts of water adsorbed. The broad bands at about 3400 cm-1 and 2475cm-1 were assigned to stretching band of silanol OH hydrogen bonded to adsorbed water. The prominent 3230 cm-1 band together with component around 2345 cm-1 were attributed to adsorbed H2O and D2O respectively. The chemical nature of the hydrogen bonding between adsorbed water and neighboring surface OH was explained adequately in terms of electrostatic interaction.

[学科分类] 化学（综合）