| Abstract: | The subject of this research is the thermodynamics of the adsorption equilibrium of three types of bleached pulp in water solutions of aliphatic amidpolyamine—Lamid-1, (L-1) in concentrations from 0.03 to 0.50 g/L in a temperature interval of 0–60°C and the influence of pH of the environment on the adsorption process. It was established that with the increase of temperature the quantity of adsorbed L-1 decreases. The values of the heat of adsorption are negative, do not depend on the quantity of adsorbed L-1, and are of the order 111.7–14.7 kJ/mol. The values of the entropy of the entropy of adsorption are also negative and are of the order of 76.8 ÷ 84.5 J/mol?K. Adsorption equilibrium is described by ther adsorption isotherm of Langmuir. Optimum pH for lower concentrations of the solution is from 5 to 7. When the concentrations of the solution are higher (C ≧ 0.15 g/L) the process can also take place very satisfactorily in an alkaline environment. |
