Faculté des sciences

The adsorption of water by active carbons, in relation to the enthalpy of immersion

Stoeckli, Fritz ; Kraehenbuehl, F. ; Morel, D.

In: Carbon, 1983, vol. 21, no. 6, p. 589-591

It is shown that there exists a simple relation between the enthalpy of immersion of pure active carbons into water, and the number of so-called primary adsorption sites a0 derived from the water adsorption isotherm by using the new Dubinin-Serpinsky equation. The adsorption sites left on the surface after outgassing near 400°C, probably of the carbonyl type, contribute to the enthalpy of... More

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    Summary
    It is shown that there exists a simple relation between the enthalpy of immersion of pure active carbons into water, and the number of so-called primary adsorption sites a0 derived from the water adsorption isotherm by using the new Dubinin-Serpinsky equation. The adsorption sites left on the surface after outgassing near 400°C, probably of the carbonyl type, contribute to the enthalpy of immersion by −25 kJ/mole, vs −0.6 kJ/mole for the bulk of the water filling the micropores at 307 K.