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Surface Properties of Mesoporous Carbon–Silica Gel Adsorbents

✍ Scribed by R. Leboda; V.V. Turov; B. Charmas; J. Skubiszewska-Zieba; V.M. Gun'ko

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
348 KB
Volume
223
Category
Article
ISSN
0021-9797

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✦ Synopsis

Carbon/silica (carbosil) samples prepared utilizing mesoporous silica gel (Si-60) modified by methylene chloride pyrolysis were studied by nitrogen adsorption, quasi-isothermal thermogravimetry, p-nitrophenol adsorption from aqueous solution, and 1 H NMR methods. The structural characteristics and other properties of carbosils depend markedly on the synthetic conditions and the amount of carbon deposited. The changes in the pore size distribution with increasing carbon concentration suggest grafting of carbon mainly in pores, leading to diminution of the mesopore radii. However, heating pure silica gel at the pyrolysis temperature of 550 • C leads to an increase in the pore radii. The quasi-isothermal thermogravimetry and 1 H NMR spectroscopy methods used to investigate the water layers on carbosils showed a significant capability of carbosils to adsorb water despite a relatively large content of the hydrophobic carbon deposit, which represents a nonuniform layer incompletely covering the oxide surface.

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