By J. J. Kipling
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Additional info for Adsorption from Solutions of Non-Electrolytes
25) defines a straight line. e. that for a considerable range of x, the composition of the adsorbed phase remains constant. This composition can be calculated if the linear section of the isotherm is extrapolated, giving values of (n\)c when x = 0 and — (n2)c when x = 1. g. ) If appropriate molecular areas are assigned to the two components, a specific surface area can be calculated for the solid. Comparison of this value with a value determined by a standard 48 ADSORPTION FROM SOLUTIONS OF NON-ELECTROLYTES FIG.
The use of mole fraction units is recommended whenever it is practicable. g. ref. 16). The composite isotherm is sometimes expressed in terms of (χΙ — Χχ), where x* is the mole fraction of component 1 in the adsorbed layer. This form emphasizes the preferential adsorption of one component. It can readily be shown that *-*i=A-°-. 15 3. ADSORPTION AT THE LIQUID-SOLID INTERFACE 29 where ns is the total number of molecules in the adsorbed layer on unit weight of solid. Hence n\x\ — x j = n\(l — Xi) — ns2Xi.
They also show that a maximum in the composite isotherm can occur even without adsorption of solvent. 2) then becomes: and the decreasing value of (1 -x) results in a fall in the value of n0Ax/m, linearly with x. 3. ADSORPTION AT THE LIQUID-SOLID INTERFACE 31 (b) Analysis of Composite Isotherms In practice, the main interest lies in resolving the composite isotherm into individual isotherms. 2) contains two unknowns, this cannot be done exactly without supplementary information relating to n\ or n\, or both.