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.