Ahn Minchul, Cho Hyeongrak, Choi Yongjun, Lee Seockheon, Lee Sangho
School of Civil and Environmental Engineering, Kookmin University, Seoul 02707, Korea.
Water and Resource Recycle Center, Korea Institute of Science and Technology, Seoul 02792, Korea.
Membranes (Basel). 2021 Jun 10;11(6):437. doi: 10.3390/membranes11060437.
The optimization of the properties for MD membranes is challenging due to the trade-off between water productivity and wetting tendency. Herein, this study presents a novel methodology to examine the properties of MD membranes. Seven polyvinylidene fluoride (PVDF) membranes were synthesized under different conditions by the phase inversion method and characterized to measure flux, rejection, contact angle (CA), liquid entry pressure (LEP), and pore sizes. Then, water vapor permeability (), salt leakage ratio (), and fiber radius () were calculated for the in-depth analysis. Results showed that the water vapor permeability and salt leakage ratio of the prepared membranes ranged from 7.76 × 10 s/m to 20.19 × 10 s/m and from 0.0020 to 0.0151, respectively. The calculated using the Purcell model was in the range from 0.598 μm to 1.690 μm. Since the was relatively small, the prepared membranes can have high LEP (more than 1.13 bar) even at low CA (less than 90.8°). The trade-off relations between the water vapor permeability and the other properties could be confirmed from the results of the prepared membranes. Based on these results, the properties of an efficient MD membrane were suggested as a guideline for the membrane development.
由于水生产率和润湿倾向之间的权衡，优化膜蒸馏（MD）膜的性能具有挑战性。在此，本研究提出了一种新颖的方法来研究MD膜的性能。通过相转化法在不同条件下合成了七种聚偏氟乙烯（PVDF）膜，并对其通量、截留率、接触角（CA）、液体进入压力（LEP）和孔径进行了表征测量。然后，计算了水蒸气透过率（）、盐泄漏率（）和纤维半径（）以进行深入分析。结果表明，所制备膜的水蒸气透过率和盐泄漏率分别为7.76×10 s/m至20.19×10 s/m和0.0020至0.0151。使用珀塞尔模型计算的在0.598μm至1.690μm范围内。由于相对较小，即使在低接触角（小于90.8°）下，所制备的膜也可以具有高的液体进入压力（超过1.13 bar）。从所制备膜的结果可以确认水蒸气透过率与其他性能之间的权衡关系。基于这些结果，提出了高效MD膜的性能作为膜开发的指导方针。
