Abstract
The surface activity of free acids and bases with hydrophobic groups is considered in comparison with corresponding anionic, cationic, and ion-pair surface activity. The hydrlytic adsorption model of froth flotation is reviewed from the points of view of “contact bubble” vs. pH curves, collector-depressant competition curves, surface hydrolysis constants, contact angle-concentration curves, and infrared spectroscopy. Methods are considered for distinguishing hydrolytic adsorption, ion-pair adsorption, and other types of adsorption processes that may conceivably yield hydrophobic surfaces by adsorption from aqueous solutions.
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