Adsorption of metal cations from aqueous solutions onto the pH responsive poly(vinylidene fluoride grafted poly(acrylic acid) (PVDF-PAA) membrane |
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| Authors: | Jouni Karppi Satu Åkerman Kari Åkerman Annika Sundell Ilkka Penttilä |
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| Affiliation: | 1.Laboratory Centre,Kuopio University Hospital,Kuopio,Finland;2.Research Institute of Public Health, School of Public Health and Clinical Nutrition,University of Kuopio,Kuopio,Finland;3.Kajaanin I apteekki,Kajaani,Finland;4.Department of Clinical Chemistry,EP Central Hospital,Sein?joki,Finland;5.Kuopio Research Institute of Exercise Medicine,Kuopio,Finland |
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| Abstract: | This study investigated the influence of pH of adsorption medium and co-adsorptive metal cations for the adsorption of potassium
(K+) and magnesium (Mg2+) ions onto poly (vinylidene fluoride) grafted poly(acrylic acid) (PAA-PVDF) membrane. At pH 4.8, the adsorption of potassium
and magnesium was minimal, because of nearly non-dissociated carboxylic acid groups of PAA-chains, but adsorption increased
with increasing ion concentration. The interaction of the studied cations between PVDF-PAA membranes increased considerably
at pH 7.0 the dissociation of carboxylic acid groups of PAA. The addition of ionic substances (calcium (Ca2+) and sodium (Na+) to the adsorption medium reduced the adsorption of potassium and magnesium onto the membrane, because of co-adsorption.
Divalent calcium reduced more effectively than univalent sodium the adsorption of potassium and magnesium onto the membrane.
In conclusion, co-adsorbing ions reduced the adsorbed amount of potassium and magnesium ions due to binding competition. The
percentual adsorbed values suggest that adsorption affinity of studied ions onto the PVDF-PAA membrane followed the order
Na+ < K+ < Mg2+ < Ca2+. The effect of metal cations on drug adsorption from biological fluids needs research in the future, because e.g. PVDF-PAA
membrane has been used in drug separation processes. |
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