One-step self-assembly fabrication of amphiphilic hyperbranched polymer composite membrane from aqueous emulsion for dye desalination
One-step self-assembly fabrication of amphiphilic hyperbranched polymer composite membrane from aqueous emulsion for dye desalination
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DOI：
10.1016/j.memsci.2013.10.034
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发表时间：
2014-02
影响因子：
9.5
通讯作者：
L. Wang;S. Ji;Naixin Wang;Rong Zhang;Guojun Zhang;Jianrong Li
中科院分区：
文献类型：
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作者：
L. Wang;S. Ji;Naixin Wang;Rong Zhang;Guojun Zhang;Jianrong Li
有机溶剂通常用于聚合物基膜的制备过程中。在本研究中，利用纯水来制备聚合物复合膜。首先通过将市售的两亲性超支化聚合物（HBP）Boltorn W3000直接溶解于水中来制备纯水乳液。作为交联剂，戊二醛，乙二醇，三乙胺，或正硅酸四乙酯，然后加入到乳液中，分别。最后，将HBP自组装到聚丙烯腈（PAN）超滤膜表面，形成复合膜。通过透射电子显微镜证实了HBP在乳液中的均匀分散，并通过红外光谱、场发射扫描电子显微镜和原子力显微镜对复合膜的形成进行了表征。重要的是，复合膜在染料保留和脱盐方面表现出优异的分离性能。例如，在操作压力为0.5 MPa时，在通量为55.0 L m-2 h-1时，甲基蓝的截留率可达97.0%，而盐的截留率低于12.0%。因此，这项工作不仅说明了一种新的方法，在水溶液中的纳滤膜的制备，但也产生了一个潜在的有用的聚合物基复合膜的高效染料脱盐。
Organic solvent usually was used in a polymer-based membrane fabricating process. In this study, otherwise pure water was utilized to prepare the polymer composite membrane. A pure aqueous emulsion was firstly prepared through directly dissolving a commercially available amphiphilic hyperbranched polymer (HBP), Boltorn W3000 into water. As the cross-linking agent, glutaraldehyde, glycol, triethylamine, or tetraethyl orthosilicate was then added into the emulsion, respectively. Finally, the HBP was self-assembled onto the surface of polyacrylonitrile (PAN) ultrafiltration membrane by immersing the PAN substrate into the emulsion to form the composite membrane. The homogeneous dispersion of the HBP in the emulsion was confirmed by transmission electron microscopy, and the formation of the composite membrane was characterized by IR spectra, field emission scanning election microscopy and atomic force microscopy. Importantly, the composite membrane performed an excellent separation performance in dye retention and desalination. For example, with the operation pressure of 0.5 MPa, the retention of methyl blue could reach 97.0% with a flux of 55.0 L m−2h−1, while the salt retention was lower than 12.0%. This work thus not only illustrated a new approach for the preparation of nanofiltration membrane in aqueous solution, but also produced a potentially useful polymer-based composite membrane for highly efficient dye desalination.