Abstract
This chapter introduces the transition-metal carbide and/or nitride (MXene) membranes having excellent ion-exclusion properties through cross-linking treatments are introduced. It discusses thermally cross-linked MXene membranes having an anti-swelling property for ion sieving. These membranes are applied to the exclusion and separation of mono- and multivalent metal ions and can be applied with a vanadium flow battery. Thermally cross-linked MXene membranes allow the separation of heavy metal ions, e.g. Pb 2+ , from monovalent metal ions, e.g. K + , under the application of a high external voltage. Ultrathin MXene-derived membranes supported on robust α-Al 2 O 3 tubular substrates have been prepared, and the d -spacing was tuned in a sinter-cross-linking process. The chapter focuses on the design and fabrication of Al 3+ ion-intercalated MXene membranes with excellent anti-swelling properties. The ion-sieving performance of Al 3+ -intercalated MXene membranes and the Al 3+ intercalation mechanism are also discussed.
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