In the present investigation, the enhancement of Cu(II) adsorption on goethite and γ-Al 2 O 3 by increasing ionic strength under acidic conditions was observed. The decrease of the electrostatic potential at the adsorption plane on the Fe/Al oxides with increasing ionic strength was responsible for the enhanced adsorption of Cu(II) by the oxides. The ζ-potential of goethite and γ-Al 2 O 3 obtained under different ionic strengths gave evidence to support the interpretation. The value of the ζ-potential of goethite and γ-Al 2 O 3 indicated that the potential at the adsorption plane decreased with the increase in ionic strength when the pH was less than the PZSE (point of zero salt effect) of the Fe/Al oxides, which was exactly opposite to the changing trends of surface charge of these oxides with ionic strength. Therefore, the decrease of the potential at the adsorption plane on these Fe/Al oxides with increasing ionic strength favored the Cu(II) adsorption.
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Jiang et al. (2010) studied this question.
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