Endowing g‐C3N4 Membranes with Superior Permeability and Stability by Using Acid Spacers. (4th October 2019)

• Record Type: Journal Article
• Authors: Ran, Jin; Pan, Ting; Wu, Yuying; Chu, Chengquan; Cui, Peng; Zhang, Pengpeng; Ai, Xinyu; Fu, Cen‐Feng; Yang, Zhengjin; Xu, Tongwen
• Is Part Of: Angewandte Chemie. Volume 131:Number 46(2019)
• Page Start: 16615
• Page End: 16620
• Publication Date: 2019-10-04
• Subjects: 2D-Materialien -- g-C3N4 -- Graphene -- Membranen -- Nanofiltration; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.201908786
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: g‐C3 N4 membranes were modulated by intercalating molecules with SO3 H and benzene moieties between layers. The intercalation molecules break up the tightly stacking structure of g‐C3 N4 laminates successfully and accordingly the modified g‐C3 N4 membranes give rise to two orders magnitude higher water permeances without sacrificing the separation efficiency. The sulfonated poly(2, 6‐dimethyl‐1, 4‐phenylene oxide) (SPPO)/g‐C3 N4 with a thickness of 350 nm presents an exceptionally high water permeance of 8867 L h −1 m −2 bar −1 and 100 % rejection towards methyl blue, while the original g‐C3 N4 membrane with a thickness of 226 nm only exhibits a permeance of 60 L h −1 m −2 bar −1 . Simultaneously, SO3 H sites firmly anchor nitrogen with base functionality distributing onto g‐C3 N4 through acid–base interactions. This enables the nanochannels of g‐C3 N4 based membranes to be stabilized in acid, basic, and also high‐pressure environments for long periods. Abstract : Saure Abstandhalter : Inspiriert von der Architektur von Graphenoxid‐Laminaten wurden g‐C3 N4 ‐Membranen moduliert, indem Moleküle mit SO3 H‐ und Benzoleinheiten zwischen den Schichten interkaliert wurden. Gegenüber der reinen g‐C3 N4 ‐Membran ergeben die modifizierten g‐C3 N4 ‐Membranen eine um zwei Größenordnungen höhere Wasserdurchlässigkeit, ohne dabei auf die Trenneffizienz zu verzichten.