Nanocomposite desalination membranes made of aromatic polyamide with cellulose nanofibers: synthesis, performance, and water diffusion study
Nanocomposite desalination membranes made of aromatic polyamide with cellulose nanofibers: synthesis, performance, and water diffusion study
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DOI：
10.1039/d0nr02915g
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发表时间：
2020-10-14
期刊：
影响因子：
6.7
通讯作者：
Endo, Morinobu
中科院分区：
文献类型：
--
作者：
Cruz-Silva, Rodolfo;Izu, Kazuo;Endo, Morinobu
合成了结晶纤维素纳米纤维增强芳香聚酰胺（PA）反渗透膜，并对其脱盐性能进行了研究。与普通PA膜的比较表明，CNF的加入降低了基质的迁移率，由于CNF表面与PA基质之间的吸引力，导致膜分子更硬。傅里叶变换-红外光谱和x射线光电子能谱结果表明，CNF表面羧基与CNF- pa复合材料中的间苯二胺单体之间形成了络合物。分子动力学模拟表明，CNF-PA具有较高的亲水性，这是制备的纳米复合膜具有较高透水性的关键。CNF-PA反渗透纳米复合膜的防污性能和抗氯性能均有所提高。因此，CNF具有良好的抗污和抗氯性能，在制备具有较长使用寿命的纳米复合芳香族PA膜方面具有很大的潜力。
Reverse osmosis membranes of aromatic polyamide (PA) reinforced with a crystalline cellulose nanofiber (CNF) were synthesized and their desalination performance was studied. Comparison with plain PA membranes shows that the addition of CNF reduced the matrix mobility resulting in a molecularly stiffer membrane because of the attractive forces between the surface of the CNFs and the PA matrix. Fourier transform-infrared spectroscopy and X-ray photoelectron spectroscopy results showed complex formation between the carboxy groups of the CNF surface and the m- phenylenediamine monomer in the CNF-PA composite. Molecular dynamics simulations showed that the CNF-PA had higher hydrophilicity which was key for the higher water permeability of the synthesized nanocomposite membrane. The CNF-PA reverse osmosis nanocomposite membranes also showed enhanced antifouling performance and improved chlorine resistance. Therefore, CNF shows great potential as a nanoreinforcing material towards the preparation of nanocomposite aromatic PA membranes with longer operation lifetime due to its antifouling and chlorine resistance properties.