▎ 摘　　要

NOVELTY - A polyvinylidene fluoride-graphene oxide composite hollow fiber membrane preparing method involves mixing polyvinylidene fluoride, pore forming agent, first solvent and water, stirring to obtain polyvinylidene fluoride solution, mixing graphene oxide and dimethylacetamide to obtain homogeneous mixture. The homogeneous mixture is mixed with polyvinylidene fluoride solution and stirred to obtain membrane casting solution. The casting solution and core liquid is extruded from a spinning nozzle with casting speed of 0.5-3 mm/minute into outer coagulation bath to obtain the finished product. USE - Method for preparing polyvinylidene fluoride-graphene oxide composite hollow fiber membrane. DETAILED DESCRIPTION - A polyvinylidene fluoride-graphene oxide composite hollow fiber membrane preparing method involves mixing 12-28 wt.% polyvinylidene fluoride, 6-30 wt.% pore forming agent, 38-70 wt.% first solvent and 0.1-3 wt.% water, stirring uniformly to obtain polyvinylidene fluoride solution, mixing 0.2-3% graphene oxide and dimethylacetamide at 70-80 degrees C for 4 hours under ultrasonic agitation to obtain homogeneous mixture of graphene oxide-dimethylacetamide. The homogeneous mixture of graphene oxide-dimethylacetamide is taken as second solvent, mixed with the polyvinylidene fluoride solution and stirred for 24 hours to obtain a membrane casting solution. The membrane casting solution is filtered and subjected for degassing. The membrane casting solution and core liquid is extruded from a spinning nozzle at 60-80 plus minus 0.4 degrees C with a casting speed of 0.5-3 mm/minute into the outer coagulation bath for 5-10 seconds to obtain the finished product, where the total weight of casting solution, polyvinylidene fluoride, pore-forming agent, first solvent, water, graphene oxide and dimethylacetamide is 100%.