Structural and Adsorptive Characteristics of Pyrocarbon/Silica Gel Si-60 |
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| Authors: | VM Gun'ko VV Turov J Skubiszewska-Zięba B Charmas R Leboda |
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| Affiliation: | (1) Institute of Surface Chemistry, 17 General Naumov Street, 03164 Kiev, Ukraine;(2) Faculty of Chemistry, Maria Curie-Sklodowska University, 20031 Lublin, Poland |
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| Abstract: | Pyrocarbon/silica gel adsorbents (carbosils, CS) with mesoporous Si-60 (Merck, granule size 0.2–0.5 mm) modified by pyrolysis of CH2Cl2 at 823 K and reaction time from 0.5 to 6 h and then hydrothermally treated at 473 K for 6 h were studied by means of TEM, adsorption and 1H NMR methods. Changes in the structural and adsorptive characteristics of hybrid adsorbents before and after hydrothermal treatment, which depend on pyrocarbon content (C
C), were analyzed on the basis of TEM micrographs and p-nitrophenol and nitrogen adsorption isotherms treated using a constrained regularization method. Interfacial water layers in aqueous suspension of CS were investigated by means of 1H NMR with freezing-out of bulk water at T < 273 K showing nonlinear changes in the Gibbs free energy of interfacial water with increasing C
C because of nonlinear dependence of the structural characteristics of pyrocarbon deposits and CS as a whole on C
C. |
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| Keywords: | mesoporous silica gel pyrocarbon/silica gel nitrogen adsorption pore size distribution p-nitrophenol adsorption interfacial water 1H NMR Gibbs free energy |
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