Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 593, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.memsci.2019.117401
Keywords
Graphene oxide; Boron nitride nanosheets; Hybrid membrane; Laminar confinement; Separation
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Funding
- National Science Foundation [CBET-1603264]
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Swelling of graphene oxide (GO) membrane greatly restricts its use in liquid separation applications. Cross-linking is widely used to stabilize GO membrane but often results in enlarged d-spacing. This work presents a durable hybrid GO/boron nitride membrane with both physical confinement and chemical bonding, which simultaneously achieves large water flux and excellent dye rejection rate. By alternating GO nanosheets and amino-modified boron nitride (a-BN) nanosheets in the hybrid membrane (a-BNGO) structure, plane-plane conformation and edge-edge covalent bonding facilitate the formation of tightly packed laminar structure, which is demonstrated efficient to restrict membrane swelling, improve water flux and methylene blue (MB) separation performance. Specifically, a-BNGO hybrid membranes, with a-BN/GO mass ratio ranging from 1:4 to 2:1, were prepared by pressurized filtration method on top of polydopamine coated polyethersulfone (PDA/PES) substrate. By optimizing the a-BN/GO ratio, high rejection rate of 99.98% and large water flux of 4.15 LMH can be achieved. The separation properties of these membranes were tested stable for up to 9 h, even in different pH conditions (pH = 4-10).
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