Abstract
The adsorption of cations and anions on synthetic amorphous aluminosilicates was investigated in the 0.1 M NaNO3 system. The amorphous aluminosilicates were synthesized by mixing 0.1 m A1C13 and 0.1 M Na2SiO3 at pH 3.1, and mixing 0.1 M NaAl(OH)4 and 0.1 m Na2SiO3 at pH 12.5, and by allowing the mixture to stand for 2 h at pH 6 with the addition of alkali and acid solutions, respectively. The adsorption of ions on the synthetic aluminosilicates was in the order of Cu(II)>Zu(II)>Mg(II), and P(V)>Se(VI)>Cr(VI) and it was controlled by the bulk pH, SiO2/Al2O3 molar ratio and coordination number of aluminum in the aluminosilicates. Aluminosilicates with 6-fold coordinated aluminum adsorbed a smaller amount of cations and a larger amount of oxyanions than those with 4-fold coordinated aluminum. The aluminum coordination number appears to major role in the adsorption of various ions in soils.
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