Abstract
Detailed adsorption isotherms based on radiochemical analyses for adsorption of oleate aqueous species on α-FeOOH (goethite) are reported. The range of total oleate and pH conditions are shown, from detailed analysis of oleate solution chemistry, to be in a domain free of liquid oleic acid or metal oleate precipitation. The form of the isotherms indicates that down to 10 −7 mole·dm 3 the adsorption is controlled by coulombic plus hydrophobic effects together with a specific adsorption component that is considered to be neutral oleic acid coadsorption with oleate anions, or acid soap dimer adsorption. The electrokinetic data also indicate a specific contribution beyond coulombic plus hydrophobic effects. For regions where precipitation of liquid oleic acid occurs a model of the surface film akin to a two-dimensional microemulsion is proposed.
Published Version
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