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Fig. 2. Zeta potential at the plane of shear, based on electrophoretic mobility measurements, as a function of pH (A) zeta potential for As(III) adsorption at two initial solution concentrations (0.05 and 0.10 mM). (B) zeta potential for Si adsorption at three initial solution concentrations (0.10, 0.20, 0.50, and 1.00 mM). Symbols represent experimental data, lines represent the Charge Distribution Multisite Surface Complexation (CD MUSIC) model predicted zeta potentials for Si and As(III) adsorption, assuming the plane of shear is located 2.6 nm from the head of the 2-plane. Suspension density 1 g L–1, background electrolyte 0.01 M NaNO3.
