Synthesis of stable COF-300 nanofiltration membrane via in-situ growth with ultrahigh flux for selective dye separation
Synthesis of stable COF-300 nanofiltration membrane via in-situ growth with ultrahigh flux for selective dye separation
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通过原位生长超高通量合成稳定的COF-300纳滤膜用于选择性染料分离
DOI：
10.1016/j.memsci.2020.118466
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发表时间：
2020-12
影响因子：
9.5
通讯作者：
Qin Peiyong
中科院分区：
文献类型：
--
作者：
Wang Ze;Si Zhihao;Cai Di;Shufeng Li;Guozhen Li;Qin Peiyong
共价有机骨架（COFs）具有结构坚固、有序、用途广泛等特点，在构建新一代分子筛膜方面具有广阔的应用前景。然而，COF膜通常具有不连续的晶体层和较差的颗粒在基底上的粘附性，限制了其广泛的应用。本文采用溶剂热法原位生长COF-300膜，制备了以NH 2改性多孔陶瓷为支撑体的高质量COF-300膜。一系列的表征表明，用3-氨丙基三乙氧基硅烷（APTES）和戊二醛（TPA）预接枝COF-300膜和陶瓷支撑体之间的共价键起到了表面锚的作用，而COF-300膜的原位生长得到了致密均匀的COF-300膜层。COF-300层为水分子提供了高效的传输途径，同时有效地排斥染料分子。如预期的那样，COF-300膜在5巴下显示出395.3 L m-2 h-1的显著通量，这是具有类似截留率的最新技术纳滤膜的5-10倍，并且对Chrome黑T（分子量为461 g mol-1）的高截留率为97.4%。重要的是，受益于高质量的COF-300层，实现了长达90小时的出色稳定性。这种原位生长方法可以加快COF膜的实际应用的步伐。
Covalent organic frameworks (COFs) hold great promise for constructing the new-generation molecular sieving membranes due to their robust, ordered and versatile architectures. However, COF membranes generally suffer from the discontinuous crystal layer and the poor particle adhesion on the substrate, limiting their widespread application. In this work, a facilein-situgrowth method was proposed under solvothermal conditions to prepare a high-quality COF-300 membrane supported on the NH2-modified porous ceramic support. A series of characterizations have demonstrated that the pre-grafting with 3-aminopropyltriethoxysilane (APTES) and terephthalaldehyde (TPA) served as a surface anchor for covalent linkers between the COF-300 membrane and the ceramic support, while the dense and uniform COF-300 layer was obtained by thein-situgrowth. The COF-300 layer provides the high-efficiency transport pathways for water molecules and simultaneously effective rejection for dye molecules. As expected, COF-300 membrane showed a remarkable flux of 395.3 L m-2h-1at 5 bar, which is 5–10 times significantly higher than those of state-of-the-art nanofiltration membranes with similar rejection, and a high rejection of 97.4% for Chrome black T (molecule weight of 461 g mol-1). Importantly, benefiting from the high-quality COF-300 layer, an outstanding stability up to 90 h was realized. Thisin-situgrowth method can speed up the paces toward practical applications of COF membranes in the future.
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作者：
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DOI：
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发表时间：
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期刊：
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