Rejections and permeation flux to inorganic electrolytes after immersing the membranes in the solutions with different pH values for 30 days.
| Electrolytes | pH values | Membrane samples | |||
|---|---|---|---|---|---|
| PEI-CC/PSF | PEI-TMC/PSF | ||||
| R (%) | F (L m−2 h−1) | R (%) | F (L m−2 h−1) | ||
| MgCl2 | 1 | 90.5 | 0.52 | 70.3 | 1.21 |
| 7 | 94.4 | 0.53 | 95.1 | 1.02 | |
| 13 | 89.6 | 0.51 | 54.8 | 1.50 | |
| MgSO4 | 1 | 87.6 | 0.50 | 66.9 | 1.28 |
| 7 | 90.5 | 0.51 | 92.8 | 1.01 | |
| 13 | 88.7 | 0.52 | 49.3 | 1.62 | |
| NaCl | 1 | 42.8 | 0.52 | 30.2 | 1.33 |
| 7 | 43 | 0.53 | 48.8 | 1.18 | |
| 13 | 39.6 | 0.53 | 27.6 | 1.72 | |
| Na2SO4 | 1 | 27.6 | 0.51 | 16.1 | 1.34 |
| 7 | 28.7 | 0.50 | 33 | 1.06 | |
| 13 | 26.3 | 0.50 | 10.5 | 1.73 | |