The layered MoS2 membrane has been proven to have unique ion rejection characteristics, high water permeability and long-term solvent stability, and has shown great potential in energy conversion/storage, sensing, and practical applications as nanofluidic devices. Chemically modified membranes of MoS2 have been shown to improve their ion rejection properties, but the mechanism behind this improvement is still unclear. This article clarifies the mechanism of ion sieving by studying the potential-dependent ion transport through functionalized MoS2 membranes. The ion permeability of the MoS2 membrane is transformed by chemical functionalization using a simple naphthalenesulfonate dye (sunset yellow), showing a significant delay in ion transport as well as a significant size and charge-based selectivity. In addition, it is reported The effects of pH, solute concentration and ion size / charge on the ion selectivity of functionalized MoS2 membranes are discussed.
Post time: Nov-22-2021