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Kinetics of Selenite Adsorption on Hydroxyaluminum- and Hydroxyaluminosilicate-Montmorillonite Complexes

Dep. of Soil Science, Univ. of Saskatchewan, 51 Campus Dr, Saskatoon, SK, Canada, S7N 5A8

View larger version (28K): [in a new window]   Fig. 1. Fourier transform infrared (FTIR) spectra of untreated montmorillonite (Mt), hydroxyaluminum (HyA)-Mt, and hydroxyaluminosilicate (HAS)-Mts: untreated Mt (a), HyA-Mt (b), hydroxyaluminosilicate with Si/Al molar ratio = 0.24 (HAS1)-Mt (c), and hydroxyaluminosilicate with Si/Al molar ratio = 0.48 (HAS2)-Mt (d).

View larger version (24K): [in a new window]   Fig. 2. Difference Fourier transform infrared (FTIR) spectra between: hydroxyaluminum (HyA)-montmorillonite (Mt) and Mt (a), hydroxyaluminosilicate with Si/Al molar ratio = 0.24 (HAS1)-Mt and Mt (b), and hydroxyaluminosilicate with Si/Al molar ratio = 0.48 (HAS2)-Mt and Mt (c).

View larger version (25K): [in a new window]   Fig. 3. Temperature effects on the kinetics of SeO3–2 sorption on montmorillonite (Mt) as influenced by hydroxyaluminum (HyA) and hydroxyaluminosilicate (HAS) interlayerings and coatings. Experiments were conducted with clay concentration, 0.5 g L–1; initial pH 4.5; initial concentration of SeO3–2 0.025 mM; and background electrolyte 0.01 M NaNO3.

View larger version (25K): [in a new window]   Fig. 4. Fitting second-order rate equation on Se sorption kinetics at 298 K. Experiments were conducted with clay concentration, 0.5 g L–1; initial pH 4.5; initial concentration of SeO3–2 0.025 mM; and background electrolyte 0.01 M NaNO3. Fast reaction was 0.083 to 0.5 h; slow reaction was 0.5 to 3 h. Mt, montmorillonite; HyA, hydroxyaluminum; HAS1, hydroxyaluminosilicate with Si/Al molar ratio = 0.24. HAS2, hydroxyaluminosilicate with Si/Al molar ration = 0.48.

View larger version (25K): [in a new window]   Fig. 5. Arrhenius plots of Se sorption kinetics, where k is second-order rate constant and T is temperature (K). Mt, montmorillonite; HyA, hydroxyaluminum; HAS1, hydroxyaluminosilicate with Si/Al molar ratio = 0.24. HAS2, hydroxyaluminosilicate with Si/Al molar ration = 0.48.