Abstract
The adsorption of oligomers of polyacrylic acid on dioxide of titane (anatase) was conducted in saline solution and pH 4. We have studied the influence of polymerisation degree and ionic strength on the adsorption. The results have shown that the isotherm presents a progress (march) which is more marked at a weak ionic strength. Although the isotherms of polyacrylic acid are Langmuir types. We also have studied the influence of terminal groups of hydrocarbon chains on the adsorption, Thus. the methyl groups increase the hydrophobicity of the carbon chain which explains the weak adsorption of oligomers. The adsorption of chloride ions and the consumption of protons correspond to a higher rate of overlapping of surface by the monomer unities. (C) 2002 Elsevier Science Ltd. All rights reserved.