▎ 摘　　要

Graphene oxide (GO) is a promising membrane system for chemical separation applications due to its 2-D nanofluidics properties and an ability to control interplanar spacing for selectivity. The permeance of water, methanol (MeOH) and isopropyl alcohol (IPA) through 5 mu m thick membranes was found to be 0.38 +/- 0.15, 0.33 +/- 0.16 and 0.42 +/- 0.31 LMH/bar (liter/m(2)center dot h center dot bar), respectively. Interestingly, the permeance of a water-alcohol mixture was found to be dramatically lower (similar to 0.01 LMH/bar) than any of its components. Upon removing the solvent mixture, the transmembrane flux of the pure solvent was recovered to near the original permeance. The interlayer space of a dried GO membrane was found to be 8.52 angstrom, which increased to 12.19 angstrom. 13.26 angstrom and 16.20 angstrom upon addition of water, MeOH and IPA. A decrease in d-space, about 2 angstrom, was consistently observed when adding alcohol to water wetted GO membrane and an optical color change and reduction in permeance. A newly proposed mechanism of a partial reduction of GO through a catalytic reaction with the water-alcohol mixture is consistent with experimental observations.