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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.
