Adsorption of a diverse set of organic vapors on quartz, CaCO3, and α-Al2O3 at different relative humidities

被引:67
作者
Goss, KU [1 ]
Schwarzenbach, RP
机构
[1] Swiss Fed Inst Environm Sci & Technol, EAWAG, CH-8600 Dubendorf, Switzerland
[2] Swiss Fed Inst Technol, Swiss Fed Inst Technol, CH-8093 Zurich, Switzerland
关键词
organic vapor adsorption; mineral surfaces; water surface; relative humidity; van der Waals interactions; electron-donor/acceptor interactions;
D O I
10.1006/jcis.2002.8447
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Adsorption constants of a diverse set of 50 organic vapors have been measured on quartz NOD, CaCO3, and alpha-Al2O3 at different relative humidities at 15degreesC. For nonpolar compounds we found an exponential decrease of the adsorption constants on a given mineral between 40 and 97% relative humidity. Extrapolated to 100% relative humidity, the adsorption constants of nonpolar compounds on the different minerals coincide and agree with those measured on a bulk water surface. The adsorption constants of polar compounds also decrease with increasing humidity up to 90%, but between 90% and 100% they increase again. We speculate that this effect is due to a change in the orientation of the water molecules hat form the surface at which the organic vapors adsorb at this high humidity. The compound variability in the adsorption constants of all compounds on a given surface at a given relative humidity could be described rather well with a linear free energy relationship using Abraham's solvation parameters for the van der Waals and electron-donor/acceptor properties of the compounds. The remaining deviation between fitted and experimental data was found to be systematic, which indicated that an optimized parameter set for the used compounds could still considerably improve the fit. (C) 2002 Elsevier Science (USA).
引用
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页码:31 / 41
页数:11
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