Abstract
Abstract : The adsorption of phenol at the nickel oxide-cyclohexane interface and the displacement of adsorbed phenol by sodium dinonyl naphthalenesulfonate were studied. The presence of physisorbed water on nickel oxide increased phenol adsorption. From adsorption isotherm plateaus, it was found that the cross-sectional area for phenol was 33.4 sq A on 'dry' nickel oxide and 24.3 sq A on 'wet' nickel oxide, corresponding approximately to tilted and vertical configurations in the adsorbed state. Competitive adsorption studies of phenol and sodium dinonyl naphthalenesulfonate on 'dry' nickel oxide have indicated that competitive adsorption at high surface coverages deviated from Langmuir behavior. An approximate competitive adsorption equation, based on the Flory- Huggins isotherm, was developed to correct for the effect of adsorbate size on competitive adsorption. Competitive adsorption data fit this modified equation.
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