Correlating the Role of Nanofillers with Active Layer Properties and Performance of Thin-Film Nanocomposite Membranes.
Correlating the Role of Nanofillers with Active Layer Properties and Performance of Thin-Film Nanocomposite Membranes.
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DOI：
10.1016/j.desal.2023.116370
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发表时间：
2023-03
期刊：
影响因子：
9.9
通讯作者：
L. Perry;N. Chew;Kasia Grzebyk;Pinar Cay-Durgun;M. Lind;Paban Sitaula;M. Soukri;O. Coronell
中科院分区：
文献类型：
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作者：
L. Perry;N. Chew;Kasia Grzebyk;Pinar Cay-Durgun;M. Lind;Paban Sitaula;M. Soukri;O. Coronell
薄膜纳米复合材料（TFN）膜是一种新兴的水净化膜，它可以提供比传统薄膜复合材料（TFC）膜更强的透水性和类似的溶质去除。然而，纳米填料掺入对活性层理化性质的影响尚未得到全面的研究。因此，我们旨在通过研究TFN和对照TFC膜之间的性能差异是否与理化性能差异相关，来了解纳米填料、活性层理化性能和膜性能之间的相关性。以林德A型（LTA）沸石和沸石咪唑骨架-8 （ZIF-8）为载体，研究了纳米填料负载、表面积和尺寸对膜性能以及活性层理化性质的影响。结果表明，当纳米填料掺入量达到~0.15 wt%时，LTA-TFN和ZIF-8-TFN膜的透水率和阻盐率均有所提高，在此基础上，LTA-TFN和ZIF-8-TFN膜的阻盐率分别降低了0.9 - 25.6%和26.1 - 48.3%。观察到的活性层物理化学性质的变化通常是不实质性的，不能解释观察到的TFN膜性能的变化。因此，TFN膜中透水性的增加可能是由于水优先通过纳米填料的多孔结构或沿着聚合物-纳米填料的界面输送。这些发现为开发用于水/离子分离的高性能TFN膜提供了新的见解。
Thin-film nanocomposite (TFN) membranes are emerging water-purification membranes that could provide enhanced water permeance with similar solute removal over traditional thin-film composite (TFC) membranes. However, the effects of nanofiller incorporation on active layer physico-chemical properties have not been comprehensively studied. Accordingly, we aimed to understand the correlation between nanofillers, active layer physico-chemical properties, and membrane performance by investigating whether observed performance differences between TFN and control TFC membranes correlated with observed differences in physico-chemical properties. The effects of nanofiller loading, surface area, and size on membrane performance, along with active layer physico-chemical properties, were characterized in TFN membranes incorporated with Linde Type A (LTA) zeolite and zeolitic imidazole framework-8 (ZIF-8). Results show that nanofiller incorporation up to ~0.15 wt% resulted in higher water permeance and unchanged salt rejection, above which salt rejection decreased 0.9–25.6 % and 26.1–48.3 % for LTA-TFN and ZIF-8-TFN membranes, respectively. Observed changes in active layer physico-chemical properties were generally unsubstantial and did not explain observed changes in TFN membrane performance. Therefore, increased water permeance in TFN membranes could be due to preferential water transport through porous structures of nanofillers or along polymer-nanofiller interfaces. These findings offer new insights into the development of high-performance TFN membranes for water/ion separations.