▎ 摘　　要

NOVELTY - A ceramic membrane water filtration flux improving method involves modifying a nitrogen atom-doped graphene having a stable layer structure on the inner surface of the pores of the alumina ceramic membrane by a gas pressure method to form an active filter layer, accurately weighing 60-140 mg of nitrogen atom-doped graphene, and ultrasonically dispersing into 1.0L ultrapure water. The prepared nitrogen atom-doped graphene dispersion is placed in a sealed stainless steel liquid storage tank, the nitrogen is opened to adjust the pressure to 0.0-4.0 bar, complete the coating of the nitrogen atom-doped graphene active filter layer on the surface of the alumina ceramic membrane, the prepared ceramic film is placed in a vacuum drying oven at 25-60 degrees C for 12-48 hours. The dried ceramic membrane is placed in a tube furnace protected by a high-purity nitrogen atmosphere to obtain an assembly of the nitrogen atom-doped graphene active filter layer on the surface of the alumina ceramic membrane. USE - Method for improving water filtration flux of a ceramic membrane. ADVANTAGE - The method increase the water production flux of the ceramic membrane assembled on the surface of the nitrogen atom-doped graphene active filter layer by 31.43%, increase the filtration performance by 42.86%, and increase the anti-membrane pollution performance by 40.34%, improve the water treatment efficiency of ceramic membranes, prolongs the membrane operation cycle and saves the cost. DETAILED DESCRIPTION - A ceramic membrane water filtration flux improving method involves modifying a nitrogen atom-doped graphene having a stable layer structure on the inner surface of the pores of the alumina ceramic membrane by a gas pressure method to form an active filter layer, accurately weighing 60-140 mg of nitrogen atom-doped graphene, where the ratio of carbon to nitrogen content in nitrogen atom-doped graphene is 43.0-45.0, and ultrasonically dispersing into 1.0L ultrapure water, ultrasonic dispersion 0.5-3.0 hours to obtain a to obtain a concentration of 60-140 mg/L nitrogen atom-doped graphene dispersion. The prepared nitrogen atom-doped graphene dispersion is placed in a sealed stainless steel liquid storage tank with an interface left, the stainless steel liquid storage tank has a volume of 1.5 L, the upper end opening is connected to the nitrogen bottle, and the lower end opening is connected to the membrane module, the nitrogen is opened to adjust the pressure to 0.0-4.0 bar, complete the coating of the nitrogen atom-doped graphene active filter layer on the surface of the alumina ceramic membrane, the prepared ceramic film is placed in a vacuum drying oven at 25-60 degrees C for 12-48 hours. The dried ceramic membrane is placed in a tube furnace protected by a high-purity nitrogen atmosphere for calcination, the calcination temperature is 300-700 degrees C, the heating rate is 2.5-5.0 degrees C/minutes, and the calcination time is 60-90 minutes to obtain an assembly of the nitrogen atom-doped graphene active filter layer on the surface of the alumina ceramic membrane.