A PREPARATION METHOD OF AN OIL-ABSORBING HOLLOW FIBER POROUS MEMBRANE

摘要

This invention discloses a preparation method of an oil-absorbing hollow fiber porous membrane. The preparation method is implemented by taking graphene as a surface adsorption layer and taking a hollow fiber porous membrane as a matrix layer through the following preparation process: (1) preparation of graphene dispersion liquid: mixing 0.1-1 g of graphene with 200-1000 ml of dispersant, and carrying out ultrasonic dispersion for 10-50 min; (2) preparation of an oil-absorbing hollow fiber porous membrane: firstly, preparing a polymer hollow fiber porous membrane into module, immersing the module into the graphene dispersion liquid prepared in step (1). Then pumping filtration is carried out from dead-end of hollow fiber porous membrane under a negative pressure of 0.02-0.08 MPa for 5-30 min, then the obtained product is naturally dried in the air until the graphene on the surface of the hollow fiber porous membrane falls off. Finally, the obtained product is put in a vacuum oven under a negative pressure of 0.1 MPa for drying at a room temperature for 6-12 h; and (3) enhancing the interface bonding strength between the graphene and the hollow fiber porous membrane by using 1) a solvent processing method or 2) a dilute solution processing method.