Charged Layered Boron Nitride-Nanoflake Membranes for Efficient Ion Separation and Water Purification.

Autor: Pendse A; Department of Chemical Engineering, University of Illinois at Chicago, Chicago, IL, 60607, USA., Cetindag S; Department of Mechanical and Aerospace Engineering, Rutgers University, Piscataway, NJ, 08854, USA., Lin MH; Department of Chemical Engineering, University of Illinois at Chicago, Chicago, IL, 60607, USA., Rackovic A; Department of Chemical Engineering, University of Illinois at Chicago, Chicago, IL, 60607, USA., Debbarma R; Department of Chemical Engineering, University of Illinois at Chicago, Chicago, IL, 60607, USA., Almassi S; Department of Chemical Engineering, University of Illinois at Chicago, Chicago, IL, 60607, USA., Chaplin BP; Department of Chemical Engineering, University of Illinois at Chicago, Chicago, IL, 60607, USA., Berry V; Department of Chemical Engineering, University of Illinois at Chicago, Chicago, IL, 60607, USA., Shan JW; Department of Mechanical and Aerospace Engineering, Rutgers University, Piscataway, NJ, 08854, USA., Kim S; Department of Chemical Engineering, University of Illinois at Chicago, Chicago, IL, 60607, USA.
Jazyk: angličtina
Zdroj: Small (Weinheim an der Bergstrasse, Germany) [Small] 2019 Dec; Vol. 15 (49), pp. e1904590. Date of Electronic Publication: 2019 Oct 10.
DOI: 10.1002/smll.201904590
Abstrakt: 2D layered nanomaterials have attracted considerable attention for their potential for highly efficient separations, among other applications. Here, a 2D lamellar membrane synthesized using hexagonal boron nitride nanoflakes (h-BNF) for highly efficient ion separation is reported. The ion-rejection performance and the water permeance of the membrane as a function of the ionic radius, ion valance, and solution pH are investigated. The nonfunctionalized h-BNF membranes show excellent ion rejection for small sized salt ions as well as for anionic dyes (>97%) while maintaining a high water permeability, ≈1.0 × 10 -3 L m m -2 h -1 bar -1 ). Experiments show that the ion-rejection performance of the membrane can be tuned by changing the solution pH. The results also suggest that the rejection is influenced by the ionic size and the electrostatic repulsion between fixed negative charges on the BN surface and the mobile ions, and is consistent with the Donnan equilibrium model. These simple-to-fabricate h-BNF membranes show a unique combination of excellent ion selectivity and high permeability compared to other 2D membranes.
(© 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.)
Databáze: MEDLINE
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