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Cited by 290

The DOI matches its Crossref record; 60 of the 60 references it cites were found in a registry or an index.

Water Adsorption on Clay Minerals As a Function of Relative Humidity: Application of BET and Freundlich Adsorption Models

Hatch, Courtney D., Wiese, Jadon S., Crane, Cameron C., Harris, Kenneth J., Kloss, Hannah G., Baltrusaitis, Jonas·2012·Langmuir
DOI 10.1021/la2042873
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Abstract

Water adsorption on kaolinite, illite, and montmorillonite clays was studied as a function of relative humidity (RH) at room temperature (298 K) using horizontal attenuated total reflectance (HATR) Fourier transform infrared (FTIR) spectroscopy equipped with a flow cell. The water content as a function of RH was modeled using the Brunauer, Emmett, and Teller (BET) and Freundlich adsorption isotherm models to provide complementary multilayer adsorption analysis of water uptake on the clays. A detailed analysis of model fit integrity is reported. From the BET fit to the experimental data, the water content on each of the three clays at monolayer (ML) water coverage was determined and found to agree with previously reported gravimetric data. However, BET analysis failed to adequately describe adsorption phenomena at RH values greater than 80%, 50%, and 70% RH for kaolinite, illite, and montmorillonite clays, respectively. The Freundlich adsorption model was found to fit the data well over the entire range of RH values studied and revealed two distinct water adsorption regimes. Data obtained from the Freundlich model showed that montmorillonite has the highest water adsorption strength and highest adsorption capacity at RH values greater than 19% (i.e., above ML water adsorption) relative to the kaolinite and illite clays. The difference in the observed water adsorption behavior between the three clays was attributed to different water uptake mechanisms based on a distribution of available adsorption sites. It is suggested that different properties drive water adsorption under different adsorption regimes resulting in the broad variability of water uptake mechanisms.

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Metadata

Authors
Hatch, C. D., Wiese, J. S., Crane, C. C., Harris, K. J., Kloss, H. G., & Baltrusaitis, J.
Venue
Langmuir
Publisher
American Chemical Society (ACS)
Published
2012-01-10
Volume
28
Issue
3
Pages
1790-1803
ISSN
  • 0743-7463 (ISSN-L)
  • 1520-5827
DOI
10.1021/la2042873
OpenAlex
W1978329962
Cited by
290
References
60
FWCI
2.22
Type
journal article
Language
en
Open access
closed

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