Precise ångström controlling the interlayer channel of MoS2 membranes by cation intercalation

MoS2 nanosheets have been used as building block candidates for assembling two dimensional (2D) laminates. However, the use of MoS2 membranes remains to be severely imposed by the narrow interlayer width of ~3 Å. In this work, we proposed a feasible and efficient approach to enlarge the interlayer d...

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Veröffentlicht in:Journal of membrane science 2020-12, Vol.615, p.118520, Article 118520
Hauptverfasser: Chu, Chengquan, Fu, Cen-Feng, Zhang, Pengpeng, Pan, Ting, Ai, Xinyu, Wu, Yuying, Cui, Peng, Huang, Qiang, Ran, Jin
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Sprache:eng
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Zusammenfassung:MoS2 nanosheets have been used as building block candidates for assembling two dimensional (2D) laminates. However, the use of MoS2 membranes remains to be severely imposed by the narrow interlayer width of ~3 Å. In this work, we proposed a feasible and efficient approach to enlarge the interlayer distance of MoS2 membranes using cations (K+, Na+, Li+ or Mg2+) intercalation. The resulting membranes show significant increases in interlayer widths, which attain 6.25, 6.63, 7.25, and 8.48 Å for K+, Na+, Li+ and Mg2+ regulation respectively. Moreover, the 2D galleries’ regularity in cations inserting MoS2 membranes is well inherited from that of the original MoS2 membrane. The water purification performances further validate the cations intercalation manipulation. In the nanofiltration mode, cations interlacation enables the water permeances of MoS2 membranes to improve 2–3 times without sacrificing dye rejections. In the forward osmosis mode, the water permeances of cations intercalating MoS2 membranes almost improve an order of magnitude (24.4× 10−3 - 36.4 × 10−3 L m−2 h−1 bar−1) in comparison with the pristine MoS2 membrane (3.4 × 10−3 L m−2 h−1 bar−1), while retaining the comparable NaCl rejections. This approach of broadening 2D channels paves a way to the design and regulation of 2D membranes for achieving extending applications. [Display omitted] •The interlayer distance of MoS2 membranes was enlarged using cation intercalation.•The interlayer width of Mg2+ regulating MoS2 membranes reaches 8.48 Å.•Cation intercalation has no impact on the interlayer regularity of MoS2 membranes.•The permeances of cation regulating MoS2 membranes improve an order of magnitude.
ISSN:0376-7388
1873-3123
DOI:10.1016/j.memsci.2020.118520