By J. J. Kipling
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Extra resources for Adsorption from Solutions of Non-Electrolytes
In the present case, pressure terms were replaced by concentration terms in the Langmuir equation. No consideration was given, however, to the relevance of applying equations derived for the adsorption of a single gas to the adsorption of one component from a liquid mixture containing at least two. In general, the procedure is invalid, as is discussed later in this chapter. The use of the Freundlich equation can be justified for very dilute solutions only (see Chapter 11). The use of an equation of the Langmuir type is described in the next section for an ideal case.
Although n\ can be obtained in this way, the corresponding value of n\ is not obtained, and for this another method is needed. A further method is, in any case, required to determine n\ and n\ for concentrated solutions. As this is immediately required for a discussion of completely miscible liquids, it is described in Chapter 4. Application to dilute solutions is described in Chapters 5, 6, and 7. REFERENCES 1. V. R. , 1944. 2. J. D. Bernal, "The Physical Basis of Life", Routledge and Kegan Paul, London, 1951.
Adsorption on charcoal gave isotherms of the form shown in Fig. g. g. acetic acid in water), between which no distinction seems to have been drawn at the time. The Freundlich equation was applied indiscriminately to the isotherms, all of which were f The Gibbs equation does, of course, apply to adsorption at all interfaces, but involves a further term (interfacial tension) and thus does not describe adsorption solely in terms of the concentration of solution. 26 ADSORPTION FROM SOLUTIONS OF NON-ELECTROLYTES limited to adsorption from dilute solutions.
Adsorption from Solutions of Non-Electrolytes by J. J. Kipling