Adsorption from binary solutions on activated charcoal at high pressures up to 490 MPa
- 1 January 1984
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
- Vol. 80 (5) , 1059-1068
- https://doi.org/10.1039/f19848001059
Abstract
Effects of pressure on surface excesses for twelve adsorption systems each consisting of a binary solution of components A and B and activated charcoal have been studied at pressures up to 490 MPa and at a temperature of 298.2 K. The following three types of pressure dependence have been observed: ∂ΓA/∂p < 0, ∂ΓA/∂p > 0, ∂ΓA/∂p= 0, where ΓA is the surface excess of component A. A comparison of these results with the difference in the pressure derivatives of pure-component interfacial tensions, (∂σo A/∂p–∂σo B/∂p=ΔAB), has revealed that ∂ΓA/∂p < 0 if ΔAB takes a large positive value, ∂ΓA/∂p > 0 if ΔAB takes a large negative value and ∂ΓA/∂p= 0 if ΔAB is small. General criteria for determining the directions of the pressure dependences of adsorption have been derived theoretically and are utilized to discuss the experimental results.Keywords
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