Fig. 2From: Adsorption of aliphatic polyhydroxy carboxylic acids on gibbsite: pH dependency and importance of adsorbate structureSorption isotherms of d-gluconic acid at four pH values (a pH 4, b pH 7, c pH 9, d pH 12). Isotherms were recorded in 5 mM NaClO4 solution. Best fits were obtained by the two-site Langmuir isotherm. The data correspond to equilibrium concentrationsBack to article page