Table 2.
Results of fitting the 27Al NMR spectra for membranes obtained in mild (AAO_40V) and hard (AAO_120V) anodization conditions in the initial state (i) and after pure water filtration (w).
| Sample | Pore diameter, nm | Water permeance L/(m2·bar·h) |
Peak area, % | Water loss below 500 °C, % | CO2 loss at crystallization, % | |||
| Al(4), (≈60 ppm) | Al(5), (≈35 ppm) | Al(6), (≈0 ppm) | Al(6), (≈7 ppm) | |||||
| AAO_40V_i | 40 ± 5 | 12.4 ± 0.5 | 19.5 ± 0.1 | 50.0 ± 0.2 | 27.1 ± 0.1 | 3.4 ± 0.1 | 3.7 | 5.3 |
| AAO_40V_w | 7.0 ± 0.4 | 20.1 ± 0.1 | 51.8 ± 0.2 | 28.1 ± 0.1 | – | 4.3 | 6 | |
| AAO_120V_i | 90 ± 10 | 73 ± 3 | 17.1 ± 0.3 | 53.0 ± 0.6 | 29.9 ± 0.5 | 0.5 ± 0.1 | 0.3 | 6 |
| AAO_120V_w | 46 ± 1 | – | 1.2 | 6.3 | ||||