Adsorption mechanism of poly(vinyl alcohol) at the mixed oxide Cu x O y -SiO2/aqueous solution interface

The adsorption and electrokinetic properties of the mixed oxide Cu x O y -SiO2 in the absence and presence of poly(vinyl alcohol) - PVA were examined. Three solids differing with the Cu x O y content were applied (0.2; 1 and 3mmol/g SiO2, respectively). The polymeric substance (100kDa) was character...

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Bibliographic Details
Published in:Applied surface science 2015-11, Vol.356, p.905-910
Main Authors: Winiewska, M, Bogatyrov, V, Szewczuk-Karpisz, K, Ostolska, I, Terpiowski, K
Format: Article
Language:English
Subjects:
Addition polymerization
Adsorption
Alcohols
Copper
Mixed oxides
Solid surfaces
Surface chemistry
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Summary:The adsorption and electrokinetic properties of the mixed oxide Cu x O y -SiO2 in the absence and presence of poly(vinyl alcohol) - PVA were examined. Three solids differing with the Cu x O y content were applied (0.2; 1 and 3mmol/g SiO2, respectively). The polymeric substance (100kDa) was characterized with the acetate groups hydrolysis degree equal to 86%. Adsorption, solid surface charge and zeta potential measurements for all types of adsorbents were carried out as a function of solution pH (3-10). The obtained results indicated that the PVA adsorption amount strongly depends on the solution pH. The higher solution pH value is, the more polymer macromolecules are adsorbed on the solid surface. Moreover, the adsorption level of polymer increases with the rise of Cu x O y content in the mixed oxide. The lack of the changes in the solid surface charge density due to the polymer addition proved that hydrogen bridges interactions are mainly responsible for PVA adsorption.
ISSN:0169-4332
DOI:10.1016/j.apsusc.2015.08.169