Location of Adsorbates in Porous Media

2 ACs Obtained from Synthetic Precursors 3.2.2.1 Location of Adsorbates in Porous Media 

Nuclear Magnetic Resonance Studies of Interfacial Phenomena 

FIGURE 3.19 Infrared spectra of carbons C-0 (1) and C-47 (2) in two scales. (Taken from Appl. Surf. Sci., 254, Gnn ko, V.M., Tnrov, V.V., Kozynchenko, O.P. et al., Characteristics of adsorption phase with water/ organic mixtnres at a snrface of activated carbons possessing intraparticle and textural porosities, 3220-3231, 2008d. Copyright 2008, with permission from Elsevier.) 

The amount of water adsorbed onto studied carbons from air is small, i.e., they are rather hydro-phobic (due to low amounts of oxygen-containing groups and the hydrophobicity of the basal planes) than hydrophilic adsorbents since adsorbed water fills only 3%-6% of the pore volume. Notice that the adsorption of water from air onto hydrophilic porous silica gels is much higher (water fills a major portion of the pore volume Chapter 1) than on the studied carbons. 

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