Influence of in situ silica gel supporting on the pore structure stability of polyacrylonitrile-based thermally crosslinked organic solvent nanofiltration membrane
Influence of in situ silica gel supporting on the pore structure stability of polyacrylonitrile-based thermally crosslinked organic solvent nanofiltration membrane
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DOI：
10.1007/s10853-023-09251-3
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发表时间：
2023-12
影响因子：
4.5
通讯作者：
Yongyue Zhang;Lin Li;Hua Wang;Xiaowen Wang;Yanqiu Pan;Tonghua Wang
中科院分区：
文献类型：
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作者：
Yongyue Zhang;Lin Li;Hua Wang;Xiaowen Wang;Yanqiu Pan;Tonghua Wang
采用原位溶胶-凝胶法在聚丙烯腈（PAN）膜孔中引入硅胶，使热交联法制备的有机溶剂纳滤膜的孔结构得到较好的保持。采用FTIR、XPS、XRD、SEM等手段系统研究了溶胶-凝胶和热交联过程中膜的化学结构、微观结构和形貌变化。由于硅胶的引入，通过硅胶对膜孔的支撑，有效地抑制了热交联过程中膜孔结构的融合。因此，原位硅胶支撑的热交联膜的渗透性能大大提高。此外，由于热交联过程中膜的梯形结构，热交联膜显示出优异的OSN性能稳定性。研究表明，原位硅胶支撑是一种很有前途的策略，以稳定PAN膜在热交联过程中的孔结构。
In this work, in situ sol–gel strategy was used to introduce silica gel in polyacrylonitrile (PAN) membrane pores, by which the pore structure of organic solvent nanofiltration (OSN) membrane prepared with thermal crosslinking was maintained well. The chemical structure, microstructure and morphology changes of membrane during sol–gel and thermal crosslinking were systematically studied by FTIR, XPS, XRD and SEM. Benefitting from the introduction of silica gel, the fusion of membrane pore structure during thermal crosslinking was effectively inhibited by supporting the pore with silica gel. Therefore, the permeances of the thermally crosslinked membranes supported by in situ silica gel were greatly improved. Furthermore, the thermally crosslinked membrane showed excellent stability of OSN performance due to the generated ladder structure of membrane during thermal crosslinking. This work showed that in situ silica gel supporting is a promising strategy to stabilize the pore structure of PAN membrane during thermal crosslinking.