Clays and Clay Minerals; December 2005; v. 53; no. 6;
p. 564-571; DOI: 10.1346/CCMN.2005.0530602
© Clay Minerals Society
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Figure 1. (a) Sorption isotherms of µmoles of Hcc sorbed/g of hematite vs. µmoles of dissolved Hcc/L of supernatant solution at pH 4.0 ± 0.05, 6.83 ± 0.07, and 9.5 ± 0.10. (b) Sorption of Hcc on hematite as a function of pH (filled circles, right-hand axis). Black dotted and dashed curves give overall repulsive (positive) or attractive (negative) forces between hematite and Hcc (references for Hcc isoelectric point and hematite point of zero charge are given in the text; Hamaker constant for van derWaals calculation from Schudel et al. (1997) and Neal et al.(1999)). The thick dashed horizontal line gives the amount of sorption corresponding to one monolayer of Hcc on hematite in hexagonal close packing. The vertical lines show the zero crossing points for the force calculations with and without van der Waals forces for easier comparison to the sorption data.
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