Adsorption of nickel(II) cations by natural zeolites

The composition of a natural specimen of zeolite-containing rock of a Transbaikal field including Ca[Al2Si7O18] · 6H2O calcium heulandite and KAlSi3O8 potash fieldspar impurity is confirmed with X-ray phase analysis and infrared spectroscopy. The time necessary for attaining adsorption equilibrium in a zeolite-aqueous nickel sulfate solution system is estimated. The limiting adsorption at different temperatures is found from the Langmuir equation. Thermodynamic and kinetic characteristics of the adsorption of nickel (II) cation on natural minerals are calculated.