Open AccessThe Influence of Acid Treatment on the Sorption Properties of Latvian Clays
Author(s) -
Augusts Ruplis,
R. Bumans
Publication year - 1993
Publication title -
adsorption science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.682
H-Index - 36
eISSN - 2048-4038
pISSN - 0263-6174
DOI - 10.1177/0263617499010001-412
Subject(s) - sorption , chemistry , adsorption , hydrochloric acid , volume (thermodynamics) , hysteresis , montmorillonite , porosity , inorganic chemistry , mineralogy , organic chemistry , thermodynamics , physics , quantum mechanics
n-Hexane and carbon tetrachloride vapour sorption isotherms at 20°C are reported for two series (A and U) of Latvian clays. Samples of the A series were prepared from triassic montmorillonite clays by sulphuric or hydrochloric acid treatment at 100°C. Samples of the U series were prepared from quaternary hydromica clays in the same way. It was found that the vapour sorption isotherms exhibit a reproducible closed hysteresis loop at P/P 0 = 0.3–0.99. For samples of series A, both the shape and the location of the hysteresis loop change as the acid concentrations increase. The BET specific surface area of both series samples increases at first and then decreases as the concentration of acid increases. Kelvin pore radii distribution curves have been calculated. It was found that the pore radius increases when the concentration of acid increases. The total pore volume of the samples was estimated as the amount of adsorbed vapour at P/P 0 =0.99. The pore volume at first increases and then decreases when the concentration of acid increases.