The Scientific World Journal / 2013 / Article / Tab 2

Research Article

Metals Ions Removal by Polymer Membranes of Different Porosity

Table 2

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

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

PES-18 PVP-13.862.111.320.140.081.021.720.507.043.718.986.97
PES-18 PVP-20.552.010.060.130.661.020.871.182.144.343.047.07
PES-18 PVP-30.581.850.980.210.111.542.013.313.975.195.65
PES-18 PVP-42.141.750.090.080.810.871.300.224.342.926.405.80

A: before filtration, B: after filtration.

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