Table 2.
Separation performance.
| Salt | Traditional polyamide membrane | Asymmetric polyamide membrane | ||
|---|---|---|---|---|
| Water flux (kg m−2 h−1) | Rejection (%) | Water flux (kg m−2 h−1) | Rejection (%) | |
| Na2SO4 | 71.4 ± 2.4 | 96.0 ± 1.8 | 264 ± 5.1 | 99.2 ± 0.3 |
| MgSO4 | 68.5 ± 2.8 | 93.4 ± 1.6 | 270 ± 8.3 | 99.1 ± 0.3 |
| CaCl2 | 59.3 ± 3.1 | 77.1 ± 1.4 | 236 ± 7.4 | 77.0 ± 1.8 |
| MgCl2 | 61.9 ± 2.9 | 80.2 ± 2.1 | 259 ± 6.3 | 80.0 ± 1.5 |
| NaCl | 71.4 ± 3.3 | 33.7 ± 2.3 | 306 ± 9.7 | 41.1 ± 1.4 |
Separation performance of the traditional polyamide nanofilm prepared on the pristine PSF substrate, and the asymmetric polyamide nanofilm prepared on the PSF-G4D-1 substrate, reaction time: 60 s. The operating pressure and temperature were controlled at 1 MPa, 25 °C. The feed flow rate was 7.5 L min–1, and the salt concentrations in the feed solutions were 2000 ppm.