The Scientific World Journal / 2013 / Article / Tab 4

Research Article

Metals Ions Removal by Polymer Membranes of Different Porosity

Table 4

Acidic properties of investigated adsorbents before and after filtration with 15 mg/dm3 iron solution (mmol/g).

MembranepKa
<33–55–77–99–11>11Acidic groupsTotal content of surface oxides
ABABABABABABABAB

PES-18 PVP-13.862.051.320.140.150.781.721.637.044.618.986.88
PES-18 PVP-20.240.552.010.060.130.660.690.871.182.144.253.046.41
PES-18 PVP-30.581.980.980.210.080.861.540.683.313.605.195.64
PES-18 PVP-42.142.280.090.120.811.081.301.024.344.506.406.93

A: before filtration, B: after filtration.

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