Composition and Physicochemical Properties of Schungite Sorbent as Influenced by Thermal Treatment

Krylov, I. O.; Lugovskaya, I. G.; Anufrieva, S. I.; Крылова, А. В.

doi:10.1023/b:rjac.0000008291.46422.bb

Cited by 3 publications

(1 citation statement)

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“…The plot of the distribution of pore volume relative to pore diameter (not depicted) showed that the principal mesopores were those with diameters of 2, 3.5, 5.5 and 20 nm. These values are similar to those reported for shungite by Krylov et al (2003). The water and hexane adsorption isotherms were convex over the relative pressure range P/P s < 0.1; however, the hysteresis loops remained open, with the desorption branch being separate from the adsorption branch down to P/P s = 0 (see Figure 2).…”

Section: Resultssupporting

confidence: 87%

Adsorption Properties of the Natural Carbon–Mineral Sorbent Shungite

Бондаренко

Tarasevich

Polyakov

et al. 2008

Adsorption Science & Technology

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Physicochemical methods were used for a comprehensive study of the structural/sorption properties of the natural mineral shungite. It was shown that the composite structure of the mineral determines its main physicochemical characteristics. The isosteric heat of adsorption of water vapour was estimated by calorimetric methods as 70 kJ/mol. This value corresponds to the interaction of water molecules with the vicinal hydroxy groups of the silica constituent of shungite; adsorption heats with values in the range 40-45 kJ/mol are characteristic of the carbon constituent of the sorbent. The heat of adsorption of benzene onto shungite was higher than that for hexane adsorption onto the mineral, indicating that specific interaction occurs between the benzene molecules and the active centres which exist on both the carbon and silica constituents of the mineral. It was shown that the adsorption parameters of shungite with respect to organic compounds which dissociate in an anionic manner suggest that the mineral could be applied as a filtering material with a sorptive action for water cleansing.

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Section: Resultssupporting

confidence: 87%