Polyvinylpyrrolidone Adsorption on Na-Montmorillonite. Effect of the Polymer Interfacial Conformation on the Colloidal Behavior and Binding of Chemicals.
Adsorption behavior of polyvinylpyrrolidone (PVP) on sodium montmorillonite, a swelling clay mineral, was investigated in diluted solutions at an ionic strength of 0.01 M, representative of environmental soil solution conditions. Physicochemical methods such as microcalorimetry, light scattering absorbance, photon correlation spectroscopy, microelectrophoresis, X-ray diffraction, and sedimentation volume measurements were used to characterize the colloidal behavior of montmorillonite particles with various PVP loadings. The extent and properties of the adsorbed PVP train, loop, and end fractions in the particle-stabilizing process have been specified. The interaction study of chemicals such as anionic surfactant sodium dodecyl sulfate and nonionized 4-monochlorophenol as well as their mixture also underlines the importance of the PVP interfacial conformations for the adsorbent capacity of this organoclay. Copyright 2000 Academic Press.
Séquaris
J
Institute of Applied Physical Chemistry (ICG7), Research Centre Jülich, Jülich, D-52425, Germany
Hild
A
Narres
HD
Schwuger
MJ