Investigation of adsorption of heavy metal ions by natural aluminosilicate

Abstract

The adsorption capacity of studied aluminosilicate samples was found to depend significantly on the sizes of grains of adsorbents. The equations for calculating the statistical exchange capacity of aluminosilicate of different fractions in relation to ions of heavy metals Ni(II), Cu(II), Zn(II), Fe(III), and Cr(III) were derived. The effective coefficients of diffusion in the adsorbent grain and in the film of solution were found. It was determined that external diffusion kinetics served as a limiting step of adsorption. The rate of the process was determined as varying from 0.16 × 10^–6 to 2.8 × 10^–6 mol/m² s.