▎ 摘　　要

NOVELTY - Preparing graphene oxide/carbon nano-tube asymmetric separation film involves using strong acid acidification treatment of carbon nano-tube to prepare uniform carbon nano-tube dispersion, pumping the carbon nano-tube dispersion to the support film substrate by a vacuum filtration device, drying for 2-6 hours at 40-80 degrees C to form graphene oxide/carbon nano-tube asymmetric separation film of carbon nano-tube layer, preparing graphene oxide by Hummers method into graphene oxide dispersion, taking a certain amount of diamine dissolved in high pure water, preparing into diamine solution with concentration of 5-50 mg/l, adding polyelectrolyte, the content of polyelectrolyte in mixed solution is 0.05-0.5 wt.%, uniformly mixing graphene oxide dispersion liquid with the mixed solution of the prepared diamine and polyelectrolyte, filtering the mixed solution to carbon nano-tube layer by a vacuum filtering device, and washing with high-purity water, processing for 2-6 hours at 50-100 degrees C. USE - Method for preparing a graphene oxide/carbon nano-tube asymmetric separating film. ADVANTAGE - The method is simple, easy to operate, without expensive raw material and device. It can improve water flux and ion interception performance at the same time under the assistant action of electric field. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for an application method of the graphene oxide/carbon nanotube asymmetric separation membrane, which involves: (A) sealing graphene oxide/carbon nanotube asymmetric separation membrane in a membrane module, the carbon nanotube layer of the separation membrane is used as a working electrode, and placing pair of electrodes parallel to the membrane on the side of the original solution, where graphene oxide layer of the separation membrane is between the working electrode and the counter electrode, and the working electrode and the counter electrode are connected to the DC stabilized power supply through a wire; (B) applying voltage through the DC stabilized power supply, and the cross-current filtering method is adopted; and (C) raw liquid to be filtered penetrates the graphene oxide/carbon nanotube asymmetric separation membrane under the action of the transmembrane pressure difference to realize the electric field assisted membrane filtration process.