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Adsorption of Mercury(II) by Kaolinite

^a Earth and Physical Sci. Div., Univ. of Texas, San Antonio, TX 78249-0663 USA
^b Dep. of Plant and Soil Sci., The Univ. of Tennessee, Knoxville, TN 37901-1071 USA
^c Dep. of Geological Sci., The Univ. of Tennessee, Knoxville, TN 37996-1410. Contribution from the Dep. of Plant and Soil Sciences, The Univ. of Tennessee USA

View larger version (22K): [in a new window]   Fig. 1 Adsorption of Hg(II) on kaolinite (3.3 g L-1) as a function of pH and ionic strength (IS), and in the presence of ligands (Cl, SO4, and PO4) and metals (Ni and Pb) (IS controlled by NaNO3)

View larger version (26K): [in a new window]   Fig. 2 Aqueous speciation of 0.6 µM Hg(II) in (a) 0.1 M NaNO3 background and in (b) 0.1 M NaNO3 + 0.01 M NaCl background

View larger version (22K): [in a new window]   Fig. 3 Triple layer modeling of Hg(II) (0.6 µM) adsorption by kaolinite (3.3 g L-1) as a function of pH from a 0.1 M NaNO3 solution (open circles represent experimental data and lines represent modeled surface complexes)

View larger version (29K): [in a new window]   Fig. 4 Triple layer modeling of Hg(II) (0.6 µM) adsorption by kaolinite (3.3 g L-1) as a function of pH and solution chemistry: (a) 0.1 M NaNO3 + 0.01 M NaCl with SiOHgOHCl- formation, (b) 0.1 M NaNO3 + 0.01 M NaCl with SiOHgOHCl- formation and log , and (c) 0.1 M NaNO3 + 0.01 M NaCl with SiOHgCl0 formation (open circles represent experimental data and lines represent modeled surface complexes)

View larger version (36K): [in a new window]   Fig. 5 Triple layer modeling of Hg(II) (0.6 µM) adsorption by kaolinite (3.3 g L-1) as a function of pH and solution chemistry: (a) 0.1 M NaNO3 + 0.01 M Na2SO4 and (b) 0.1 M NaNO3 + 0.01 M Na3PO4 (open circles represent experimental data and lines represent modeled surface complexes)

View larger version (32K): [in a new window]   Fig. 6 Triple layer modeling of Hg(II) (0.6 µM) adsorption by kaolinite (3.3 g L-1) as a function of pH and solution chemistry: (a) 0.1 M NaNO3 + 48 µM Ni(NO3)2, (b) 0.1 M NaNO3 + 14 µM Pb(NO3)2 (open circles represent experimental data and lines represent modeled surface complexes)