Abstract
Adsorption isotherms of the cationic additives Al 2(SO 4) 3 and polyDADMAC on fractioned spruce groundwood have been determined at different pH values at 298 K. Similar measurements with model surfaces prepared of cellulose and lignin were carried out using the quartz crystal microbalance. Adsorption of aluminum on all surfaces studied is governed by its solution phase hydrolysis and precipitation and the role of the surface properties seems to be only secondary. The adsorption equilibria of Al 2(SO 4) 3 depend strongly on solution pH, whereas adsorption of polyDADMAC is only slightly enhanced by increasing pH. The difference between the amounts adsorbed by groundwood fibers and fines can be explained by the much larger specific surface area of the latter. Moreover, the specific surface area available for adsorption seems to be different for aluminum species and for polyDADMAC. The results obtained with the model surfaces agree qualitatively with the adsorption data of groundwood fractions.
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