A model of the two-stage condensation mechanism of water adsorption on nonporous carbon adsorbents

被引：10
|
作者：
Berezin, GI [1 ]
Vartapetyan, RS [1 ]
Voloshchuk, AM [1 ]
Petukhova, GA [1 ]
Polyakov, NS [1 ]
机构：
[1] Russian Acad Sci, Inst Phys Chem, Moscow 117915, Russia
来源：
RUSSIAN CHEMICAL BULLETIN | 1998年 / 47卷 / 10期
基金：
俄罗斯基础研究基金会;
关键词：
adsorption; nonporous carbon adsorbents; model of condensation mechanism;
D O I：
10.1007/BF02494488
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
The mechanism of adsorption of water molecules on nonporous carbon adsorbents has been suggested in terms of two different states of adsorbed water: stretched liquid water and water that occupies an intermediate state between the liquid and vapor. Two stages of adsorption were distinguished: condensation and pre-condensation that assumes the formation of molecular associates. The BET model was used to describe the pre-condensation stage. The equations of the adsorption isotherm for water vapor in the region of condensation process and the expression for the determination of the specific hydrophilic surface of adsorbents were found. Examination of the experimental data on adsorption of water vapor on nongraphitized samples of carbon adsorbents shows that in the region of polymolecular adsorption, all isotherms fall into a common curve determined by the equation of the stretched liquid film and can be calculated regardless of the properties of individual liquid water. The equation for adsorption of water vapor on the hydrophobic surface was obtained.
引用
收藏
页码：1879 / 1885
页数：7
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