ZIF-8-incorporated thin-film nanocomposite (TFN) nanofiltration membranes: Importance of particle deposition methods on structure and performance
ZIF-8-incorporated thin-film nanocomposite (TFN) nanofiltration membranes: Importance of particle deposition methods on structure and performance
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DOI：
10.1016/j.memsci.2021.119356
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发表时间：
2021-08
影响因子：
9.5
通讯作者：
Xiaona Wu;Lei Yang;F. Meng;Wenli Shao;Xiang Liu;Miao Li
中科院分区：
文献类型：
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作者：
Xiaona Wu;Lei Yang;F. Meng;Wenli Shao;Xiang Liu;Miao Li
功能纳米材料的掺入是增强或开发新材料性能的一项有前景的技术，例如提高与水净化和再利用相关的渗透性和选择性。在此，ZIF-8纳米颗粒用于通过两步原位生长和一步共混界面聚合（IP）方法制备薄膜纳米复合材料（TFN）膜。主要目的是研究不同制备方法和ZIF-8纳米颗粒对TFN膜结构和性能的具体影响。结果表明，ZIF-8 纳米颗粒增加了聚酰胺排斥层的负电荷、粗糙度和亲水性。与两步原位生长方法相比，一步共混方法对 TFN 膜特性的影响有限。将ZIF-8纳米颗粒有效掺入TFN膜中，TFN-ZIF-0.64的透水率提高至20.8±0.62L·m−2·h−1·bar−1，Na2SO4截留率提高至94.2±3.4%，与TFC膜相比，透水率提高了约1.3倍，截留率提高了8.0%。相比之下，两步原位生长 ZIF-8 修饰的 TFN 膜对典型阴离子染料表现出超高的截留率，表现出优异的纳滤性能。
The incorporation of functional nanomaterials is a promising technique to enhance or develop novel material properties, such as improvement of permeability and selectivity related to water purification and reuse. Herein, ZIF-8 nanoparticles were used to prepare the thin-film nanocomposite (TFN) membranes via both two-step in situ growth and one-step blending interfacial polymerization (IP) methods. The primary purpose was to investigate specific effects of different preparation methods and ZIF-8 nanoparticles on the structure and properties of TFN membranes. The results show that ZIF-8 nanoparticles increased the negative charge, roughness, and hydrophilicity of the polyamide rejection layer. The effects of one-step blending method on the TFN membrane characteristics were limited as compared to the two-step in situ growth method. The effective incorporation of ZIF-8 nanoparticles into TFN membranes increased the water permeability of TFN-ZIF-0.64 to 20.8 ± 0.62 L·m−2·h−1·bar−1and enhanced the Na2SO4rejection to 94.2 ± 3.4%, which is approximately 1.3 times increase in water permeability and 8.0% rise in rejection than those of TFC membrane. Comparatively, two-step in situ growth ZIF-8-modified TFN membranes displayed ultrahigh rejection of typical anionic dyes, demonstrating superior NF performance.