▎ 摘　　要

NOVELTY - Preparing nanofiltration membrane involves dispersing graphene oxide powder in a hydrochloric acid solution of tyrosine, and ultrasonically dispersing it at 40-50 degrees C for 20-24 hours to obtain graphene dispersion, adding cucurbituril to it and continuing ultrasonic dispersion for 5-6 hours to obtain a cucurbituril intercalated graphene dispersion, dispersing graphene oxide powder in tyrosine hydrochloric acid solution, and ultrasonically dispersing it at 40-50 degrees C for 20-24 hours, obtaining graphene dispersion, adding carboxymethyl hydroxypropyl guar gum and polyacrylamide to it in sequence, then adding deionized water to it, stirring well to obtain spinning solution, injecting the spinning solution into syringe pump of the spinning device, obtaining a nanofiber membrane by electrostatic spinning, removing the nanofiber membrane from the metal substrate, soaking it in the crosslinking agent solution, and then taking it out to obtain a base membrane for use. USE - Method for preparing nanofiltration membrane with heavy metal retention capacity. ADVANTAGE - The method provides composite nanofiltration membrane having good stability and high water flux, and has good retention capacity for divalent/high-valent anions, heavy metal ions and anionic dyes, and is expected to be applied to the treatment of wastewater polluted by heavy metals and organic dyes. DETAILED DESCRIPTION - Preparing nanofiltration membrane involves dispersing graphene oxide powder in a hydrochloric acid solution of tyrosine, and ultrasonically dispersing it at 40-50 degrees C for 20-24 hours to obtain graphene dispersion, adding cucurbituril to it and continuing ultrasonic dispersion for 5-6 hours to obtain a cucurbituril intercalated graphene dispersion, dispersing graphene oxide powder in tyrosine hydrochloric acid solution, and ultrasonically dispersing it at 40-50 degrees C for 20-24 hours, obtaining graphene dispersion, adding carboxymethyl hydroxypropyl guar gum and polyacrylamide to it in sequence, then adding deionized water to it, stirring well to obtain spinning solution, injecting the spinning solution into syringe pump of the spinning device, obtaining a nanofiber membrane by electrostatic spinning, removing the nanofiber membrane from the metal substrate, soaking it in the crosslinking agent solution, and then taking it out to obtain a base membrane for use. Vacuum filtration is used to deposit different amounts of aminocucurbituril intercalated graphene dispersion on the base membrane to obtain composite nanofiltration membrane. The porous base film is made of graphene oxide, tyrosine, carboxymethyl hydroxypropyl guar gum, and polyacrylamide as raw materials.