COF-based nanofiltration membrane for effective treatment of wastewater containing pharmaceutical residues
COF-based nanofiltration membrane for effective treatment of wastewater containing pharmaceutical residues
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DOI：
10.1016/j.memsci.2023.121780
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发表时间：
2023-05
影响因子：
9.5
通讯作者：
Kornkamol Banjerdteerakul;Hao Peng;Kang Li
中科院分区：
文献类型：
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作者：
Kornkamol Banjerdteerakul;Hao Peng;Kang Li
纳滤已被确定为从废水中去除新兴药物的有效方法，具有减轻环境影响和改善水质的潜力。然而，目前纳滤膜的低分离效率阻碍了其发展。在这里，使用真空辅助自组装方法，我们制备了薄膜复合膜堆叠共价有机框架（COF）纳米片上预先设计的陶瓷中空纤维。通过添加甲醇作为组装的共溶剂，在YSZ中空纤维的顶部形成连续且无缺陷的COF TpPa-SO 3 H层。所得COF复合膜对五种环境持久性药物（即，双氯芬酸、磺胺甲恶唑、酮洛芬、萘普生和布洛芬）。COF的亲水性孔表面和强酮-胺键确保了操作期间的高且稳定的渗透，其中分离由静电排斥和空间排阻控制。由于我们的设计使用陶瓷中空纤维，这些膜占地面积小，可以很容易地集成到现有的水处理系统中。这些特点使得COF基纳滤膜成为减轻废水中新兴药物对环境影响的一种有前途的选择。
Nanofiltration has been identified as an effective method for removing emerging pharmaceuticals from wastewater with potential to mitigate environmental impacts and improve water quality. However, the low separation efficiency from the current nanofiltration membranes impeded their development. Here, using the vacuum-assisted self-assembly method, we prepared a thin film composite membrane by stacking covalent organic framework (COF) nanosheets on a predesigned ceramic hollow fibre. By adding methanol as the co-solvent for the assembly, a continuous and defect-free COF TpPa-SO3H layer was formed on top of the YSZ hollow fibre. The resultant COF composite membrane showed high rejection for five environmentally persistent pharmaceuticals (i.e., diclofenac, sulfamethoxazole, ketoprofen, naproxen, and ibuprofen). The hydrophilic pore surface and strong keto-amine linkages of the COF ensured high and stable permeation during operation with separation governed by electrostatic repulsion and steric exclusion. Due to our design using ceramic hollow fibres, these membranes have a small footprint and can be easily integrated into existing water treatment systems. These features make COF-based nanofiltration membranes a promising option for mitigating the environmental impacts of emerging pharmaceuticals in wastewater.