Powierzchniowe i strukturalne właściwości niemodyfikowanych i modyfikowanych żeli krzemionkowych

• Autorzy: Choma J. , Jaroniec M.

Warianty tytułu

EN

Surface and structural properties of unmodified and modified silica gels

• Języki publikacji: PL

Abstrakty

EN

Of the set of methods for the characterization of the surface and structural properties of unmodified and modified mesoporous silica gels (which is reviewed in the present paper), special consideration was given to the BET, [alfa]s-plot and Dollimore-Heal methods for the characterization of the adsorption process. For the needs of these characterization, use was made of the low-temperature (77 K) nitrogen adsorption isotherms on unmodified and octyl phase modified silica gel Nitrogen adsorption isotherms on unmodified and modified macroporous LiChrospherSi-1000 silica were used as the reference data. As shown by the results, an accurate characterization of nanoporous silica gels requires that the adsorption data be measured in the entire range of relative pressures. Another crucial problem is the selection of the reference solid because the resulting parameters of the porous structure depend on the reference adsorption isotherm used. The reference silica should display properties analogous to those of the silica studied.

Słowa kluczowe

PL

adsorpcja azotu; adsorbent; żele krzemionkowe; właściwości powierzchniowe; właściwości strukturalne

• Wydawca: Polskie Zrzeszenie Inżynierów i Techników Sanitarnych, Oddział Dolnośląski
• Czasopismo: Ochrona Środowiska
• Rocznik: 2000
• Tom: nr 2
• Strony: 3--8
• Opis fizyczny: Bibliogr. 23 poz., rys., tab.

Twórcy

autor

Choma J.

• Instytut Chemii, Wojskowa Akademia Techniczna, ul. S. Kaliskiego 2, 00-908 Warszawa

autor

Jaroniec M.

• Separation and Surface Science Center, Department of Chemistry, Kent State University, Kent, Ohio 44242, USA

Bibliografia

• 1. M. KRUK, M. JARONIEC: Surfaces Nanoparticles and Porous Materials. J. A. Schwarz, C. I. Contescu (Eds.), Surface and Structural Properties of Modified Porous Silicas, Marcel Dekker, New York 1999, pp. 443-472.
• 2. H. E. BERGNA (Ed.): The Colloidal Chemistry of Silica. American Chemical Society, Washington DC 1994.
• 3. E. F. VANSANT, P. VAN DER VOORT, K. C. VRANCKEN: Characterization and Modification of the Silica Surface. Elsevier, Amsterdam 1995.
• 4. J. CHOMA, M. JARONIEC: Nowe metody opisu struktury porowatej węgli aktywnych na podstawie danych adsorpcyjnych. Ochrona Środowiska, 1999, nr 3(74), ss. 12-17.
• 5. M. JARONIEC, R. MADEY: Physical Adsorption on Heterogeneous Solids. Elsevier, Amsterdam 1988.
• 6. M. JARONIEC, M. KRUK, J. CHOMA: Characterizations of Porous Solids: Adsorption potential distribution and its thermodynamic im- plications. In: Characterization of Porous Solids IV (B. McEnaney, T. J. Mays, J. Rouquerol, F. Rodriguez-Reinoso, K. S. W. Sing, K. K. UngerEds.), Royal Society of Chemistry, London 1997, pp. 163-170.
• 7. A. SAYARI, P. LIU, M. KRUK, M. JARONIEC: Characterization of largepore MCM-41 molecular sieves obtained via hydrothermal restructuring. Chem. Mat., 1997, Vol. 9, pp. 2499-2506.
• 8. M. KRUK, M. JARONIEC, A. SAYARI: Adsorption study of surface and structural properties of MCM-41 materials of different pore size. J. Phys. Chem. B, 1997, Vol. 101, pp. 583-589.
• 9. M. KRUK, M. JARONIEC, R. RYOO, J. M. KIM: Characterization of high-quality MCM-48 and SBA-1 mesoporous silicas. Chem. Mat., 1999, Vol. 11, pp. 2568-2572.
• 10. M. KRUK, M. JARONIEC, A. SAYARI: Surface heterogeneity analysis of MCM-41 metallosilicates by using nitrogen adsorption data. Langmuir, 1999, Vol. 15, pp. 5683-5688.
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• 15. Y. BEREZNITSKI, M. JARONIEC: Liquid chromatography studies of acetonitrile sorption on silica-based octyl phases. J. Liq. Chrom. & Rei. Technol., 1999, Vol. 22, pp. 1945-1964.
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• 17. S. J. GREGG, K. S. W. SING: Adsorption, Surface Area and Porosity. Academic Press, London 1991.
• 18. M. JARONIEC, M. KRUK, J. P. OLIVIER: Standard nitrogen adsorption data for characterization of nanoporous silicas. Langmuir, 1999, Vol. 15, pp. 5410-5413.
• 19. M. KRUK, V. ANTOCHSHUK, M. JARONIEC, A. SAYARI: New approach to evaluate pore size distributions and surface areas fes- hydrophobic mesoporous solids. J. Phys. Chem. B, 1999, Vol. 103, pp. 10670-10678.
• 20. M. JARONIEC, K. KANEKO: Physicochemical foundations for characterizing of adsorbents by using high-resolution comparative plots. Langmuir, 1997, Vol. 13, pp. 6589-6596.
• 21. E. P. BARRETT, L. G. JOYNER, P. P. HALENDA: The determination of pore volume and area distributions in porous substances. I. Computations ffom nitrogen isotherms. J. Am. Chem. Soc., 1951, Vol. 73, pp. 373—380.
• 22. D. DOLLIMORE, G. R. HEAL: An improved method for the calcu- lation of pore size distribution from adsorption data. J. Appl. Chem., 1964, Vol. 14, pp. 109-114.
• 23. M. KRUK, M. JARONIEC, A. SAYARI: Application of large pore MCM-41 molecular sieves to improve pore size analysis using nitrogen adsorption measurements. Langmuir, 1997, Vol. 13, pp. 6267-6273