Interaction of Water with the Surface of Calcite

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Abstract
The interaction of water with the surface of ground calcite was investigated by measuring the water adsorption isotherm and the amount of thermally desorbed molecules in vacuo. The results showed that the surface of ground calcite has chemisorbed water at room temperature which can be completely desorbed by evacuation up to 600 °C, and on which water can be physisorbed in a H2O:OH ratio between 1:2 and 1:1, depending on the conditions of the pretreatment. The isosteric heat of the physisorption of water on the hydroxyls showed that the activity of the adsorption sites for water is reduced by treating the sample at higher temperatures or by washing with water. Moreover, it was found that the surface of the calcite sample starts to release CO2 molecules by heat treatment at relatively low temperatures below 300 °C in vacuo, and that the amount of CO2 increases exponentially with an increase in the temperature.

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