Hassanpour Amir, Gauthier Marc A, Sun Shuhui
Institut National de la Recherche Scientifique, Centre Énergie Matériaux Télécommunications, Varennes, QC, J3X 1P7, Canada.
Sci Rep. 2024 Jan 16;14(1):1443. doi: 10.1038/s41598-024-51309-y.
Laminar graphene oxide (GO) is a promising candidate material for next-generation highly water-permeable membranes. Despite extensive research, there is little information known concerning GO's ion-sieving properties at high acidic/basic pH and temperatures. In this study, the ion-blockage properties of the pristine GO and GO/zinc oxide (ZnO) nanocomposite membranes were tested using a non-pressure-driven filtration setup over a wide range of pH and temperatures. The ZnO nanoparticles within the composite membranes were synthesized via the room-temperature oxidation of zinc acetate and zinc acrylate precursors and were uniformly distributed across the composite membrane. It is observed that partially replacing the zinc acetate precursor with zinc acrylate improves the blockage performance of the composite membranes under extreme basic conditions by 42%. Moreover, photocatalytically-reduced composite membranes blocked copper sulfate ions 28% more than as-prepared composite membranes. Further, it was discovered that the composition of the membrane plays a vital role in its ion blockage performance at higher temperatures.
层状氧化石墨烯（GO）是下一代高透水性膜的一种很有前景的候选材料。尽管进行了广泛的研究，但关于GO在高酸性/碱性pH值和温度下的离子筛分特性，人们所知甚少。在本研究中，使用非压力驱动过滤装置在广泛的pH值和温度范围内测试了原始GO和GO/氧化锌（ZnO）纳米复合膜的离子阻断性能。复合膜中的ZnO纳米颗粒是通过醋酸锌和丙烯酸锌前驱体的室温氧化合成的，并均匀分布在复合膜中。观察到用丙烯酸锌部分替代醋酸锌前驱体可使复合膜在极端碱性条件下的阻断性能提高42%。此外，光催化还原的复合膜比制备好的复合膜对硫酸铜离子的阻断能力高出28%。此外，还发现膜的组成在较高温度下对其离子阻断性能起着至关重要的作用。
