D. Santhiya et al., EFFECT OF POLYMER MOLECULAR-WEIGHT ON THE ADSORPTION OF POLYACRYLIC-ACID AT THE ALUMINA-WATER INTERFACE, Colloids and surfaces. A, Physicochemical and engineering aspects, 133(1-2), 1998, pp. 157-163
The adsorption and electrokinetic characteristics of alumina suspensio
ns in the presence of polyacrylic acid as a dispersant have been studi
ed. The adsorption isotherms exhibit high-affinity Langmuirian behavio
ur. The adsorption density decreases with increasing in pH, while it i
ncreases with increasing molecular weight of the polymer. Electrokinet
ic studies indicate specific adsorption at and above the isoelectric p
oint of the alumina sample. Possible mechanisms of interaction between
alumina and polyacrylic acid are discussed. (C) 1998 Elsevier Science
B.V.