Molecule Channels Directed by Cation‐Decorated Graphene Oxide Nanosheets and Their Application as Membrane Reactors

Abstract

Highly selective macromembranes, fabricated by cation-decorated graphene oxide, exhibit an excellent selectivity toward a wide range of solvents. Mixed solvents are successfully separated, based on which a membrane reactor is designed to promote a series of chemical reactions. The cations bonding to the graphene oxide nanosheets are found to be responsible for this selectivity by cation-π, electrostatic interactions, and hydrogen bonding.

Oxygen‐Defected Molybdenum Oxides Hierarchical Nanostructure Constructed by Atomic‐Level Thickness Nanosheets as an Efficient Absorber for Solar Steam Generation

“…To utilize the MoO x HNS for solar steam generation, we loaded it on a hydrophilic polytetrafluoroethylene (PTFE) film via an extraction filtration approach under vacuum . Due to its assemble structure, the MoO x HNS can easily pile up and form a hydrophilic film (the composite membrane can be donated as MoO x HNS Membrane, Figure S11, Supporting Information).…”

Precisely Controlling Nanochannels of Graphene Oxide Membranes through Lignin‐Based Cation Decoration for Dehydration of Biofuels

“…[4] However, GO membranes can swell or even crack when immersed in aqueous solutions, [5] whereupon the stacked nanochannels are disrupted and the practical performance is significantly compromised. Although cations can also be bonded to the GO nanosheets by simplya dding inorganic salt into GO solution,t he resulting flocculent cation-GOs uspension [11] cannotb ea ssembled into GO membranes with ordered nanochannels, ensuringe ssential selectivity for molecular separations.Herein, we propose the use of lignin-based cations as ap latform to precisely control the nanochannels of GO membranes to realize high-performance solventd ehydration. Unfortunately,t he permeation flux often sharply declineso wing to the shrinkage or blockage of the nanochannels.…”

“…As ar esult, the separation factor is also enlarged at highertemperature. [11,19] Screening of furtherc ations with suitable hydrated size that could form strong interactions with GO is currently underway. Amongs tate-of-the-art polymeric membranes and graphene-based membranes for ethanol dehydration (TableS4), our membranes exhibit the highest flux and ag ood separation factor ( Figure 4).…”

“…[10] Nevertheless, the efficient rejection of ions through the cation-controlled GO membranes relied on aqueous solutionsc ontaining cations that are not often presenti na pplicationsf or processes such as solvent dehydration or gas separation. Although cations can also be bonded to the GO nanosheets by simplya dding inorganic salt into GO solution,t he resulting flocculent cation-GOs uspension [11] cannotb ea ssembled into GO membranes with ordered nanochannels, ensuringe ssential selectivity for molecular separations.Herein, we propose the use of lignin-based cations as ap latform to precisely control the nanochannels of GO membranes to realize high-performance solventd ehydration. Interactions between the cation and the GO nanosheet lead to ordered and tunable interlayer nanochannels( Figure1), whereas anionic lignin is expected to stabilize the dispersion of cation-functionalized GO nanosheets in water (Figure 1a!b).…”

“…[10] Nevertheless, the efficient rejection of ions through the cation-controlled GO membranes relied on aqueous solutionsc ontaining cations that are not often presenti na pplicationsf or processes such as solvent dehydration or gas separation. Although cations can also be bonded to the GO nanosheets by simplya dding inorganic salt into GO solution,t he resulting flocculent cation-GOs uspension [11] cannotb ea ssembled into GO membranes with ordered nanochannels, ensuringe ssential selectivity for molecular separations.…”