Hyperbranched Poly(ether amine)@Poly(vinylidene fluoride) Hybrid Membrane with Oriented Nanostructures for Fast Molecular Filtration.
Hyperbranched Poly(ether amine)@Poly(vinylidene fluoride) Hybrid Membrane with Oriented Nanostructures for Fast Molecular Filtration.
复制标题
DOI：
10.1021/acs.langmuir.7b03676
复制
发表时间：
2018-03
期刊：
影响因子：
--
通讯作者：
Kejian Ji;Hongjie Xu;Xiaodong Ma;Jie Yin;Xuesong Jiang
中科院分区：
文献类型：
--
作者：
Kejian Ji;Hongjie Xu;Xiaodong Ma;Jie Yin;Xuesong Jiang
多孔膜具有均匀的纳米结构和选择性吸附，可实现高通量的分子过滤，在水处理和工业分离中具有广泛的应用前景，受到了人们的广泛关注。采用结晶扩散法对聚偏氟乙烯（PVDF）膜进行功能化，制备了一种具有定向纳米结构和选择性吸附客体分子的超支化聚醚胺@聚偏氟乙烯（hPEA@PVDF）多孔膜。通过扫描电子显微镜和X射线光电子能谱对所得hPEA@PVDF多孔膜进行了全面表征。结果表明，hPEA@PVDF膜具有定向的开放通道结构，水通量高达2116 L m-2 h-1，其中PVDF骨架被两亲性的hPEA层所覆盖。系统研究了hPEA@PVDF多孔膜对12种亲水性染料的间歇吸附和分子过滤吸附行为。结果表明，hPEA@PVDF膜对赤藓红B（577 μmol g-1）和曙红B（511 μmol g-1）具有较高的吸附容量，而对钙黄绿素（76 μmol g-1）和亚甲基蓝（几乎不吸附）具有较低的吸附容量，表明其对水溶液中染料具有选择性吸附行为。基于这种选择性，hPEA@PVDF可用于通过分子过滤非常有效地分离染料混合物。此外，经过5次吸附-脱附循环后，分离效率仍保持100%，表明其在实际应用中具有很大的潜力。
Porous membranes with uniform nanostructures and selective adsorption can realize molecular filtration with high flux and have gained great attention because of their wide application in water treatment and industrial separation. Herein, a novel hyperbranched poly(ether amine)@poly(vinylidene fluoride) (hPEA@PVDF) porous membrane with oriented nanostructures and selective adsorption of guest molecules was fabricated by applying the combined crystallization and diffusion method for the functionalization of the PVDF membrane. The resulting hPEA@PVDF porous membranes were fully characterized by scanning electron microscopy and X-ray photoelectron spectra. The results indicated that the hPEA@PVDF membrane exhibited oriented open channel structure and high water flux up to 2116 L m-2 h-1, in which the PVDF skeleton was covered by the amphiphilic hPEA layer. The adsorption behavior of hPEA@PVDF porous membranes to 12 hydrophilic dyes including batch adsorption and molecular filtration was systematically investigated. The results revealed that the hPEA@PVDF membrane possessed high adsorption capacity toward erythrosin B (577 μmol g-1) and eosin B (511 μmol g-1), while low adsorption capacity toward calcein (76 μmol g-1) and methylene blue (hardly adsorbed), indicating the selective adsorption behavior toward dyes in aqueous solution. On the basis of this selective property, the hPEA@PVDF could be used to separate the dye mixtures very efficiently through molecular filtration. In addition, the separation efficiency remained 100% after five adsorption-desorption cycles, indicating that it had great potential in practical applications.