Research Article
Metals Ions Removal by Polymer Membranes of Different Porosity
Table 3
Basic properties of investigated adsorbents before and after filtration with 15 mg/dm3 copper solution (mmol/g).
| | Membrane | pKa | | | | | | <3 | 3–5 | 5–7 | 7–9 | 9–11 | >11 | Basic groups | Total content of surface oxides | | A | B | A | B | A | B | A | B | A | B | A | B | A | B | A | B |
| | PES-18 PVP-1 | — | — | 0.27 | 1.49 | 0.30 | 0.34 | — | — | 0.99 | 1.02 | 0.38 | 0.41 | 1.94 | 3.26 | 8.98 | 6.97 | | PES-18 PVP-2 | — | — | 0.13 | 1.37 | 0.10 | 0.31 | 0.05 | — | 0.62 | 1.05 | — | 0.36 | 0.90 | 2.73 | 3.04 | 7.07 | | PES-18 PVP-3 | — | — | 0.26 | 0.25 | 0.24 | 0.24 | 0.18 | — | 0.87 | 1.19 | 0.33 | — | 1.88 | 1.68 | 5.19 | 5.65 | | PES-18 PVP-4 | — | — | 0.26 | 1.25 | 0.31 | 0.27 | — | — | 1.12 | 1.00 | 0.37 | 0.36 | 2.06 | 2.88 | 6.40 | 5.80 |
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A: before filtration, B: after filtration.
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