Ultrapermeable nanofiltration membranes with tunable selectivity fabricated with polyaniline nanofibers. Issue 8 (2nd February 2022)

• Record Type: Journal Article
• Authors: Ji, Chenhao; Lin, Cheng-Wei; Zhang, Shenghao; Guo, Yaoli; Yang, Zhe; Hu, Weiping; Xue, Shuangmei; Niu, Q. Jason; Kaner, Richard B.
• Is Part Of: Journal of materials chemistry. Volume 10:Issue 8(2022)
• Page Start: 4392
• Page End: 4401
• Publication Date: 2022-02-02
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d1ta10898k
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : A nanofibrous polyaniline interlayer controls the reaction dynamics of the interfacial polymerization through its reversible acid doping chemistry. Abstract : Ultrapermeable polyamide nanofiltration membranes with tunable salt sieving properties were prepared using polyaniline nanofibers. The structural evolution of the three-layered thin film composites enables the formation of both ultrathin and nanostructured polyamide selective layers on a macroporous microfiltration membrane for improved water permeance, while the acid doping chemistry of polyaniline endows the polyamide layer with tunable pore size and surface charge for improved ion sieving. The membrane with a confined pore size in the polyamide layer shows selectivities of 30.1 for Mg 2+ /Na + and 279.0 for SO4 2− /Cl − with a high water permeance of 39.1 L m −2 h −1 bar −1 . The membrane with an enlarged pore size in the polyamide layer demonstrates an ultrahigh water permeance of 49.7 L m −2 h −1 bar −1 with good retention for both Na2 SO4 and MgSO4 which equals 98.7% and 97.9% salt rejection, respectively.