Sorption of nitrogen, water vapor, and benzene by charcoal cloth

Abstract

Charcoal cloth has been characterized by small angle neutron scattering (SANS) and sorption techniques. A SANS gyration radius of 10Åwas obtained for the charcoal cloth compared with a gyration radius in the range 6 to 9Åfrom the Dubinin—Rudushkevich (DR) nitrogen and benzene “B” values. The charcoal cloth pores approximated a cylinder shape in the SANS analysis.Type I sorption isotherms of benzene (303 K) and nitrogen (77 K) on charcoal cloth confirm its predominantly microporous nature with a surface area in excess of 1000 m2 g−1, and obeyance of the Gurvitsch rule giving a pore volume of 0.65 cm3 g−1. A type V water (303 K) isotherm showing linear Dubinin behavior in the range 0.3 <P/P0 < 0.5 indicates a different adsorption mechanism for water. The number of oxygenated sites (2.3 mmole g−1 is smaller than the N2 BET monolayer capacity (14 mmole g−1).