Abstract
The adsorption of sodium decanoate and sodium dodecanoate on aluminum hydroxide gels at various pH values was studied by (1) the difference of solution concentrations and (2) the electrophoretic mobility method. The gels were produced by adequate dilution of coagulating solutions obtained by neutralizing 0.1 M aluminum chloride solutions with sodium hydroxide. Coagulating solutions were characterized by the neutralization ratio r = [NaOH]/[Al T]. The shapes of the experimental isotherms are the result of two-dimensional condensation on heterogeneous surfaces when θ < 1 and of two-dimensional condensation on more homogeneous surfaces when 1 < θ < 2. On transfer of one CH 2 group from the adsorbed condensed layer to solution, the value of the free energy change is 1.45 kT. The state of the adsorbed layer is the same as that of the reticular plane of the precipitated phase which appears at higher concentrations. When the pH of treated solutions is 6.5, the aluminum hydroxide specific surface areas decrease, for instance, from 1200 to 600 m 2 g −1 as the ratio r increases.
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