Adsorption of metal cations from aqueous solutions onto the pH responsive poly(vinylidene fluoride grafted poly(acrylic acid) (PVDF-PAA) membrane

被引:28
作者
Karppi, Jouni [1 ,2 ]
Akerman, Satu [3 ]
Akerman, Kari [4 ]
Sundell, Annika [5 ]
Penttila, Ilkka [2 ,5 ]
机构
[1] Univ Kuopio, Sch Publ Hlth & Clin Nutr, Publ Hlth Res Inst, FI-70211 Kuopio, Finland
[2] Kuopio Univ Hosp, Lab Ctr, FI-70211 Kuopio, Finland
[3] Kajaanin I Apteekki, Kajaani 87100, Finland
[4] EP Cent Hosp, Dept Clin Chem, FI-60220 Seinajoki, Finland
[5] Kuopio Res Inst Exercise Med, FI-70100 Kuopio, Finland
关键词
Cations; PVDF-PAA; Adsorption; pH; Co-adsorption; EXCHANGE MEMBRANE; DIVALENT-CATION; IN-VITRO; DRUGS; SELECTIVITY; CHANNELS; RELEASE; CALCIUM; IONS;
D O I
10.1007/s10965-009-9291-x
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
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.
引用
收藏
页码:71 / 76
页数:6
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