In this diploma thesis, the equilibrium adsorption of copper ions from the copper ions solutions of various initial concentrations was investigated in a batch reactor on the humus at a constant temperature of 308 K, a stirring speed of 200 rpm for 96 h. The increase in the initial concentrations of copper ions solutions does not significantly affect on the equilibrium amount of copper ions adsorbed on the humus because it slightly changes. The maximum adsorption capacity of copper ions on the humus was achieved at a concentration of 8.016 mmol dm-3 with the value of 0.518 mmol g-1 for the given experimental conditions. The adsorption efficiency of copper ions on the humus decreases with an increase in the initial concentration of copper ions, and the maximum adsorption capacity of copper ions on the humus was achieved at the lowest selected initial concentration of 4.049 mmol dm-3 with the value of 60.320 %. The experimental data obtained were tested on Langmuir, Freundlich, Toth, Redlich-Peterson and Sips isotherms. By estimating the quality of the agreement of adsorption models with the experimental data, comparing the calculated values of statistical parameters for RMSE and χ2 and the maximum adsorption capacity with the experimentally obtained, it can be concluded that the best agreement with experimental data is shown by the Toth isotherm, which was developed to extend the application of the Langmuir model in heterogeneous systems.