|کد مقاله||کد نشریه||سال انتشار||مقاله انگلیسی||ترجمه فارسی||نسخه تمام متن|
|622664||1455300||2016||7 صفحه PDF||سفارش دهید||دانلود رایگان|
• Semipermeable membranes based on polybenzimidazoles (PBIs).
• Cross-linking and N-substitution induced the suppression of the hydrogen bondings.
• Facile thermal cross-linking of PBI membranes improved their water flux and salt rejection.
To develop next-generation high-performance semipermeable membranes, novel semipermeable membranes based on the cross-linked polybenzimidazole have been synthesized and characterized. Polybenzimidazole with N-butylsufonate (BSPBI) was prepared by the two steps, that is, deprotonation of PBI using lithium hydride, followed by treatment with 1,4-butanesultone. FTIR measurements showed that the N-substitution and cross-linking suppressed the hydrogen bonding. WAXD analyses also revealed that polymer packing was disrupted by the N-substitution and cross-linking. These results clearly indicate that the suppression of hydrogen bonding induced by the N-substitution and the cross-linking cause disruption of the polymer packing. The cross-linking reaction of BSPBI with divinyl sulfone led to the change of the pore size distribution, where the selective permeation of water molecule was successfully achieved. As a result, simultaneous improvement in water flux and salt rejection was achieved by the facile cross-linking reaction. The cross-linking of BSPBI simultaneously improved both water flux and salt rejection (water flux: 22.1 L m− 2 h− 1 and NaCl rejection: 46%) compared to those of non-cross-linked BSPBI (water flux: 1.88 L m− 2 h− 1 and NaCl rejection: 11%). These findings should contribute to develop high-performance semipermeable membranes for water treatment including reverse osmosis (RO), forward osmosis (FO), and pressure retarded osmosis (PRO).
Figure optionsDownload as PowerPoint slide
Journal: Desalination - Volume 395, 3 October 2016, Pages 1–7