Adsorption Kinetics of Nickel(II) and Copper(II) Ions by Modified Aluminosilicates

Abstract

The adsorption kinetics of nickel(II) and copper(II) ions by alumosilicates modified with N,N'-bis (3-triethoxysilylpropyl) thiocarbamide (BTM-3) and HCl is studied using the kinetic pseudo-first and pseudo-second order models. It is shown that when aluminosilicates are modified the time for equilibrium establishment is reduced by factors of 1.33 for adsorption of copper(II) ions and 2 for nickel(II) ions. The rate and energy of adsorption increase. It is established that the kinetics of the adsorption of the studied ions is best described by a pseudo-second order model. At the same time, the values of the correlation coefficients are 0.997–0.998. The maximum value of the adsorption rate constant of 33.7 × 10^–5 g/(mmol min) corresponds to nickel(II) ions for aluminosilicates modified with HCl. The initial adsorption rate is 8.70 × 10^–3 mmol/(g min). The maximum value of the adsorption rate constant value of 2.91 × 10^–5 g/(mmol min) for aluminosilicates modified with BTM-3 corresponds to Cu(II) ions.