Graphite phase carbon nitride based membrane for selective permeation

Yang Wang, Niannian Wu, Yan Wang, Huan Ma, Junxiang Zhang, Lili Xu, Mohamed K. Albolkany and Bo Liu ()
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Yang Wang: University of Science and Technology of China
Niannian Wu: University of Science and Technology of China
Yan Wang: University of Science and Technology of China
Huan Ma: University of Science and Technology of China
Junxiang Zhang: University of Science and Technology of China
Lili Xu: University of Science and Technology of China
Mohamed K. Albolkany: University of Science and Technology of China
Bo Liu: University of Science and Technology of China

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: Abstract Precise control of interlayer spacing and functionality is crucial in two-dimensional material based membrane separation technology. Here we show anion intercalation in protonated graphite phase carbon nitride (GCN) that tunes the interlayer spacing and functions of GCN-based membranes for selective permeation in aqueous/organic solutions. Sulfate anion intercalation leads to a crystalline and amphipathic membrane with an accessible interlayer spacing at ~10.8 Å, which allows high solvent permeability and sieves out the solutes with sizes larger than the spacing. We further extend the concept and illustrate the example of GCN-based chiral membrane via incorporating (1R)-(-)-10-camphorsulfonic anion into protonated GCN layers. The membrane exhibits a molecular weight cutoff around 150 among various enantiomers and highly enantioselective permeation towards limonene racemate with an enantiomeric excess value of 89%. This work paves a feasible way to achieve water purification and chiral separation technologies using decorated laminated membranes.

Date: 2019
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DOI: 10.1038/s41467-019-10381-z

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