Abstract
The dependence of the thermodynamic characteristics of adsorption of various classes of organic compounds on the chemical nature of the silica surface modified with 3-bromopropyltrichlorosilane to form a monolayer coating (Br-2 sample), a grafted polymer type layer (Br-5 sample), and additionally silanized layer (Br-5* sample) was studied by gas chromatography. The dispersion interactions on bromosilicas were more active than on the starting support or the NH2 sample with a grafted aminopropyl layer of the polymer type. The role of specific interactions generally decreases in the series Br-2 > Br-5 > Br-5* > NH2. An analysis of the obtained data indicates that the retention mechanism on silicas with bromopropyl groups is determined by the penetration of adsorbed molecules into the grafted layer. In contrast, the aminopropyl polymer layer has a more rigid structure with limited conformational mobility of the grafted aminopropyl groups, the adsorption retention mechanism dominating in this case.
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Roshchina, T.M., Shoniya, N.K. Adsorption Equilibria in the Nanopores of Silicas with Grafted Bromopropyl Groups. Russ. J. Phys. Chem. 93, 1931–1938 (2019). https://doi.org/10.1134/S0036024419100224
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DOI: https://doi.org/10.1134/S0036024419100224