Negatively charged polyimide nanofiltration membranes with high selectivity and performance stability by optimization of synergistic imidization
Negatively charged polyimide nanofiltration membranes with high selectivity and performance stability by optimization of synergistic imidization
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通过协同酰亚胺化优化制备具有高选择性和性能稳定性的带负电的聚酰亚胺纳滤膜
DOI：
10.1016/j.memsci.2018.06.046
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发表时间：
2018-10
影响因子：
9.5
通讯作者：
Li Chen
中科院分区：
文献类型：
--
作者：
Chenjie Wei;Zhifu He;Ligang Lin;Qi Cheng;Kai Huang;Sisi Ma;Li Chen
提出了一种通过优化协同酰亚胺化反应制备高性能聚酰亚胺纳滤膜的简单方法。采用化学酰亚胺化法成功地控制和制备了部分酰亚胺化的可溶性聚酰胺酸聚合物。以该产物为基体，通过相转化和热亚胺化反应，得到了具有完整表皮的非对称结构的纳滤膜。该方法有效地避免了直接高温转化法制备PI-NF膜易脆裂的缺陷。所制备的膜对染料、PEG和典型盐具有很高的截留率。制造的PI-NF膜具有高的异丙醇渗透性[约1 L/（m2 h bar）]和高的孟加拉玫瑰红截留率（大于92%）。PI-NF膜的截留分子量低于800 Da。在优化条件下制得的PI-NF膜纯水通量约为20 L/（m2 h），在5 bar压力下对Na 2SO 4的截留率为93.91%。对不同盐的截留率大小顺序为：Na_2SO_4> MgSO_4> NaCl > MgCl_2，表明Donnan排阻理论和空间位阻效应是主要的截留机理。此外，NF膜在长期过滤过程中显示出优异的稳定性。
A simple strategy is proposed for high performance polyimide nanofiltration (PI-NF) membranes by optimization of a synergistic imidization reaction. Soluble poly(amic acid) polymers with partial imidization was successfully controlled and fabricated by chemical imidization. With the product as a matrix, NF membranes with an integrally skinned asymmetric architecture were obtained by phase inversion and subsequent thermal imidization. The brittle and ruptured defects caused by directly high temperature conversion for fabricating PI-NF membranes were effectively avoided. The prepared membrane showed high rejections for dye, PEG and typical salts. The fabricated PI-NF membranes were endowed with a high permeance of isopropyl alcohol [approximately 1 L/(m2h bar)] and a high rejection of rose Bengal (greater than 92%). The molecular weight cut-off of PI-NF membrane is below 800 Da. The pure water flux of PI-NF membrane prepared under optimized conditions was approximately 20 L/(m2h) and the rejection for Na2SO4was 93.91% at 5 bar. The rejection for different salts followed the order: Na2SO4> MgSO4> NaCl > MgCl2, revealed that Donnan exclusion theory and steric hindrance effect dominated the rejection mechanism. Furthermore, the NF membranes showed excellent stability over a long-term filtration process.
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