Benzenecarboxylate surface complexation at the goethite (α-FeOOH)/water interface -: III.: The influence of particle surface area and the significance of modeling parameters

被引:30
作者
Boily, JF [1 ]
Persson, P [1 ]
Sjöberg, S [1 ]
机构
[1] Umea Univ, Dept Inorgan Chem, S-90187 Umea, Sweden
关键词
goethite; carboxylate; adsorption; complexation; modeling;
D O I
10.1006/jcis.2000.6886
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
A surface complexation model describing the adsorption of three benzenecarboxylates (phthalate, trimellitate, and pyromellitate) on goethite (alpha-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. (C) 2000 Academic Press.
引用
收藏
页码:132 / 140
页数:9
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