▎ 摘　　要

NOVELTY - Preparing amphiphilic graphene oxide modified ultra-thin composite nanofiltration membrane comprises dispersing amphiphilic graphene oxide in an aqueous solution to obtain an amphiphilic graphene oxide dispersion having a concentration of 0.01-0.8 g / L. Then, the amphiphilic graphene oxide dispersion liquid and an aqueous solution having a mass fraction of 0.1-3 wt.% piperazine are mixed to obtain an aqueous phase. Then, an n-hexane solution of trimesoyl chloride with an oil phase mass fraction of 0.01-1 wt.% is added to the water phase, and a polymerization reaction occurs at an interface between the oil phase and the water phase to form an ultra-thin film. The mass ratio of the amphiphilic graphene oxide to piperazine is 0.1 to 20: 1. The ultrafiltration membrane bottom film is placed at the interface near the oil phase side and the ultra-thin film is completely bonded. USE - Method for preparing amphiphilic graphene oxide modified ultra-thin composite nanofiltration membrane used for seawater desalination (claimed). ADVANTAGE - The method enables to prepare amphiphilic graphene oxide modified ultra-thin composite nanofiltration membrane, which significantly improves the flux of the nanofiltration membrane. DETAILED DESCRIPTION - Preparing amphiphilic graphene oxide modified ultra-thin composite nanofiltration membrane comprises dispersing amphiphilic graphene oxide in an aqueous solution to obtain an amphiphilic graphene oxide dispersion having a concentration of 0.01-0.8 g / L. Then, the amphiphilic graphene oxide dispersion liquid and an aqueous solution having a mass fraction of 0.1-3 wt.% piperazine are mixed to obtain an aqueous phase. Then, an n-hexane solution of trimesoyl chloride with an oil phase mass fraction of 0.01-1 wt.% is added to the water phase, and a polymerization reaction occurs at an interface between the oil phase and the water phase to form an ultra-thin film. The mass ratio of the amphiphilic graphene oxide to piperazine is 0.1 to 20: 1. The ultrafiltration membrane bottom film is placed at the interface near the oil phase side and the ultra-thin film is completely bonded. Then take out the ultrafiltration membrane bottom membrane covered with the ultrathin film and put it in an oven to dry, to obtain amphiphilic graphene oxide modified ultrathin composite nanofiltration membrane.