▎ 摘　　要

NOVELTY - Evaluating the structural stability of a graphene oxide film nano-channel comprises (i) using ultrapure water as the influent water, and the filtering device at a filtration pressure of 0.2-0.8 MPa and using of graphene oxide film for constant pressure filtration until the ultrapure water flux is stable; (ii) taking the ultrapure water flux of the last 15-45 minutes in step (i) to obtain stable ultrapure water flux of the graphene oxide film; (iii) using of sodium aqueous solution prepared by using ultrapure water as solvent as a feed water and performing a constant pressure filtration with a graphene oxide film in a filtration apparatus under the same conditions as the filtration pressure described in the step (i) until the sodium aqueous solution flux is stable; (iv) taking the flow of the sodium aqueous solution in the last 15-45 minutes of step (iii) to obtain stable sodium aqueous solution flux of the graphene oxide film; and (v) representing the film instability factor by k. USE - The method is useful for evaluating the structural stability of a graphene oxide film nano-channel. ADVANTAGE - The method is easy to implement, economical, evaluate the advantages and disadvantages of the preparation method of different graphene oxide films in the stability of the membrane structure, quickly determine whether the graphene oxide film is good for long-term filtration of an aqueous solution system and actuality of the graphene oxide film. DETAILED DESCRIPTION - Evaluating the structural stability of a graphene oxide film nano-channel comprises (i) using ultrapure water as the influent water, and the filtering device at a filtration pressure of 0.2-0.8 MPa and using of graphene oxide film for constant pressure filtration until the ultrapure water flux is stable; (ii) taking the ultrapure water flux of the last 15-45 minutes in step (i) to obtain stable ultrapure water flux of the graphene oxide film; (iii) using of sodium aqueous solution prepared by using ultrapure water as solvent as a feed water and performing a constant pressure filtration with a graphene oxide film in a filtration apparatus under the same conditions as the filtration pressure described in the step (i) until the sodium aqueous solution flux is stable; (iv) taking the flow of the sodium aqueous solution in the last 15-45 minutes of step (iii) to obtain stable sodium aqueous solution flux of the graphene oxide film; and (v) representing the film instability factor by k, where the k = graphite oxide stable sodium aqueous solution flux of olefin film-stable ultrapure water flux of graphene oxide film and k value is negatively correlated with stability.