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Benzenecarboxylate Surface Complexation at the Goethite (α-FeOOH)/Water Interface: III. The Influence of Particle Surface Area and the Significance of Modeling Parameters

✍ Scribed by Jean-François Boily; Per Persson; Staffan Sjöberg

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
258 KB
Volume
227
Category
Article
ISSN
0021-9797

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✦ Synopsis

A surface complexation model describing the adsorption of three benzenecarboxylates (phthalate, trimellitate, and pyromellitate) on goethite (α-FeOOH) was calibrated on data using goethite particles of 37 and 43 m 2 /g surface area. The models predict potentiometric titration and batch adsorption data with the multisite complexation model coupled with the three-plane model to account for surface electrostatics. The modeling parameters were found to be similar to those calibrated on benzenecarboxylate adsorption data on goethite particles of 90 m 2 /g (Boily et al. Geochim. Cosmochim. Acta, in press). The significance of the benzenecarboxylate-dependent values of the modeling parameters is also discussed. The values of the capacitances of the inner-and outer-Helmholtz planes were shown to be important modeling parameters to model the benzenecarboxylate-dependent slopes of the adsorption edges. It was shown that the larger the charge of the ligand, the larger the capacitance of the outer-Helmholtz plane.

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