Thermodynamic characteristics of the adsorption of organic molecules on modified МCM-41 adsorbents

The adsorption of a number of organic molecules on samples of МCM-41 adsorbent modified with dichloromethylphenylsilane and subsequently treated with sulfuric acid (MDCS) and N -trimethoxysilylpropyl- N , N , N -trimethylammonium chloride (MNM) is studied. Specific retention volumes equal to the Hen...

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Bibliographic Details
Published in:Russian Journal of Physical Chemistry A 2017-07, Vol.91 (7), p.1319-1323
Main Authors: Gus’kov, V. Yu, Sukhareva, D. A., Salikhova, G. R., Karpov, S. I., Kudasheva, F. Kh, Roessner, F., Borodina, E. V.
Format: Article
Language:English
Subjects:
Adsorbents
Adsorption
Alcohols
Chemistry
Chemistry and Materials Science
Chlorides
Dilution
Dispersion
Enthalpy
Gas chromatography
Grafting
Heat of adsorption
Inverse gas chromatography
Mathematical analysis
Organic chemistry
Organic compounds
Physical Chemistry
Physical Chemistry of Surface Phenomena
Polarity
Sulfuric acid
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Summary:The adsorption of a number of organic molecules on samples of МCM-41 adsorbent modified with dichloromethylphenylsilane and subsequently treated with sulfuric acid (MDCS) and N -trimethoxysilylpropyl- N , N , N -trimethylammonium chloride (MNM) is studied. Specific retention volumes equal to the Henry constant are determined by means of inverse gas chromatography at infinite dilution. The thermodynamic characteristics of adsorption, the dispersive and specific components of the Helmholtz energy of adsorption, and the increment of the methyl group to the heat of adsorption are calculated. It is shown that the grafting of aminosilane and phenylsilane groups enhances the forces of dispersion and reduces specific interactions. A greater drop in polarity is observed for MDCS than for MNM, due to the stronger polarity of amoinosilane; the enthalpy factor makes the main contribution to the adsorption of organic compounds on the investigated adsorbents. It is found that the MNM sample is capable of the irreversible adsorption of alcohols.
ISSN:0036-0244
1531-863X
DOI:10.1134/S0036024417070135