Zusammenfassung: Untersucht wurde die Thermodynamik des Adsorptionsgleichgewichts an drei Zellstoffarten in w~it~rigen L6sungen von Polyamidamin (PAAM) mit einer Konzentration von 0.03 g/1 bis 0.30 g/1 und im Temperaturbereich yon 0 ~ bis 60 ~ Es wurde festgestellt, dat~ mit Temperaturerh6hung die Menge des adsorbierten PAAM abnimmt. Die erhaltenen Werte far die Adsorptionswiirme sind negativ, sind unabh~ingig von der Menge des adsorbierten PAAM und liegen in der Gr6flenordnung 9.6-10.6 kJ/mol. Die Werte far die Adsorptionsentropie sind ebenfalls negativ und sind in der GrOf~enordnung von 65-70J/mol. K. Das Adsorptionsgleichgewicht wird mit ausreichender Genauigkeit durch eine Langmuirsche Adsorptionsisotherme beschrieben. Aus den Ergebnissen kann man schlugfolgern, dab die Adsorption von PAAM aus seinen w~iigrigen L6sungen an Zellstoff im untersuchten Temperaturintervall ohne Ausbildung fester chemischer Bindungen abl~iuft und aufgrund elektrostatischer Wechselwirkungen zustandekommt. Abstract:The thermodynamics of the adsorption equilibrium is investigated for three types of cellulose in water solutions of polyamidamine (PAAM) of concentrations from 0.03 g/l to 0.30 g/1 in the temperature interval from 0 ~ to 60 ~ It is estabfished that the increase in temperature decreases the PAAM amount adsorbed. The obtained values of the adsorption heats are negative, do not depend on the amount of adsorbed PAAM, and are in the order of 9.6-10.6 kJ/mol. The values of the adsorption entropy are also negative and in the order of 65-70 J/mol. K. The adsorption equilibrium is described by Langmuir's adsorption isotherm. From the results obtained the conclusion can be derived that the PAAM adsorption from its water solutions by cellulose in the investigated temperature interval takes place without establishment of strong chemical bonds, and is established at the expense of electrostatic interactions.
The kinetic dependences have been investigated of the adsorption process of polyamideamine on monocarboxyl cellulose, bleached sulphate cellulose pulp of softwood and bleached sulphite cellulose pulp of hardwood. It has been found that the process kinetics can be described by means of the Hovich-Tyomkin exponential kinetic equation; the influence of the entropy factors plays a decisive role in changing the process speed; the activation energy is of the order of 6.5-8.0 kJ/mol.
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