A Graphene Oxide Membrane with Highly Selective Molecular Separation of Aqueous Organic Solution

Abstract

A graphene oxide (GO) membrane is supported on a ceramic hollow fiber prepared by a vacuum suction method. This GO membrane exhibited excellent water permeation for dimethyl carbonate/water mixtures through a pervaporation process. At 25 °C and 2.6 wt % feed water content, the permeate water content reached 95.2 wt% with a high permeation flux (1702 g m(-2) h(-1)).

High‐Efficiency Water‐Transport Channels using the Synergistic Effect of a Hydrophilic Polymer and Graphene Oxide Laminates

“…The GO laminates were fabricated on a ceramic hollow fi ber support ( Figure S16, Supporting Information) by the vacuum suction method previously reported. [ 18 ] The detailed processes are described as follows. One side of the ceramic hollow fi ber was sealed and the other side was connected to a vacuum pump.…”

“…The quartz crystal microbalance technique (QCM200 Quartz Crystal Microbalance, Stanford Research Systems, Inc.) was used to test the sorption ability; the test was carried out as per our previous report. [ 18 ] Supplementary Notes 1-3 in the Supporting Information describe the detailed experiment about nanoscratch test, PV separation test, and gas separation test, respectively.…”

“…First, we prepared the pristine GO laminates on α-Al 2 O 3 ceramic hollow fi ber supports, as previously described. [ 18 ] Then, the hydrophilic CS polymeric layer was fabricated on the pristine GO laminates by the vacuum suction method, which is described in detail in the Experimental Section. The fi nal, as-prepared membrane is denoted as a CS@GO membrane.…”

“…A preferential sorption-diffusivity mechanism was proposed in our previous work. [ 18 ] The preferential watersorption ability and fast water diffusivity of the GO laminates mainly contribute to the dehydration. However, a consequent question is "which is the dominant factor?"…”

“…[ 11,12 ] Up to now, many breakthroughs about GO membranes have been discovered and reported. [ 13 -16 ] The exciting selective permeation results, including our recent studies, [ 17,18 ] have demonstrated that GO is a new-generation material platform for high-performance separation membranes with inspiring fast water, [ 18 -21 ] gas, [ 14,15,17,22 ] and ion [ 23,24 ] transport channels. These intrinsic and unique channels offer a wide variety of applications for small-molecule separation under aqueous conditions [ 16,18 -21,23,24 ] or for the separation of…”