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

被引:56
作者
Pendse, Aaditya [1 ]
Cetindag, Semih [2 ]
Lin, Meng-Hsuan [1 ]
Rackovic, Angelina [1 ]
Debbarma, Rousan [1 ]
Almassi, Soroush [1 ]
Chaplin, Brian P. [1 ]
Berry, Vikas [1 ]
Shan, Jerry W. [2 ]
Kim, Sangil [1 ]
机构
[1] Univ Illinois, Dept Chem Engn, Chicago, IL 60607 USA
[2] Rutgers State Univ, Dept Mech & Aerosp Engn, Piscataway, NJ 08854 USA
基金
美国国家科学基金会;
关键词
2D nanosheets; boron nitride; ion selectivity; layered materials; nanostructured membranes; GRAPHENE; TRANSPORT; SINGLE; GAS;
D O I
10.1002/smll.201904590
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
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, approximate to 1.0 x 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.
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页数:8
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