▎ 摘　　要

NOVELTY - The membrane has a laminate membrane body comprising graphene oxide flakes including size distribution such that greater than 75% of the flakes include a shortest lateral dimension that is greater than 3 micro meter, where thickness of the laminate membrane body is less than 80 nm, full width of half maximum of X-ray diffraction peak for the interlayer spacing of the laminate membrane is between 0.1-2 degree and the graphene oxide flakes include average oxygen and carbon weight ratio in range of from 0.01 : 1.0-0.5: 1.0. The laminate membrane body is stored with organic solution. USE - Graphene oxide laminate membrane e.g. filter or removable and replaceable filter unit. ADVANTAGE - The membrane utilizes thin graphene oxide films to realize relatively easy permeation through pinholes without atomic-size cutoff observed for thicker laminates. The membrane utilizes small amount of surfactant to decrease surface tension of water, thus avoiding membrane damage during water permeation experiments. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for reducing amount of solute in organic solution to produce product solution depleted in solute or solutes. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of pinholes in graphene oxide membrane, and a continuous interconnected graphene oxide plane formed by random overlap of graphene oxide flakes.