▎ 摘　　要

NOVELTY - Preparing graphene oxide/carbon nanotube composite filter membrane for oil-water separation comprises e.g. (i) selecting raw material comprising sheet-layer graphene oxide, carbon nanotubes and substrate membrane, where substrate membrane is a cellulose microporous filter membrane, (ii) preparing graphene oxide dispersion and carbon nanotube dispersion, mixing graphene oxide and carbon nanotubes with distilled water, and obtaining graphene oxide dispersion and multi-walled carbon nanotube dispersion, (iii) preparing graphene oxide and multi-walled carbon nanotubes mixed solution, (iv) designing vacuum filtration device, (v) preparing graphene oxide/multi-walled carbon nanotube composite membrane, and placing substrate membrane in middle of sand core plate to cover sand core, and pouring mixture of graphene oxide and multi-walled carbon nanotubes into filter cup, and (vi) taking out graphene oxide/multi-walled carbon nanotube composite membrane by drying and packaging. USE - The method is useful for preparing graphene oxide/carbon nanotube composite filter membrane for oil-water separation. ADVANTAGE - The method: utilizes carbon nanotubes with excellent mechanical properties and unique pore structure characteristics; utilizes graphene together to form a composite material with a three-dimensional structure in space; increases the contact area between the filler and the substrate; exerts the synergistic effect of graphene and carbon nanotubes, which can construct, change and optimize membrane channels; improves the penetration effect; and obtains nanocomposite material having better desalination and antifouling performance than traditional single filler modification. DETAILED DESCRIPTION - Preparing graphene oxide/carbon nanotube composite filter membrane for oil-water separation comprises (i) selecting raw material comprising sheet-layer graphene oxide, carbon nanotubes and substrate membrane, where substrate membrane is a cellulose microporous filter membrane with pore size of 0.2-0.4 microns which is ultrasonically cleaned and dried, (ii) preparing graphene oxide dispersion and carbon nanotube dispersion, mixing graphene oxide and carbon nanotubes with distilled water in a mass ratio of 1-2:1000, magnetically stirring at 50-150 revolutions per minute at room temperature for 1-3 hours, accompanying by 30-50 kHz ultrasonic wave to disperse and control above-mentioned mixed liquid, and obtaining graphene oxide dispersion and multi-walled carbon nanotube dispersion, (iii) preparing graphene oxide and multi-walled carbon nanotubes mixed solution by mixing graphene oxide dispersion and multi-walled carbon nanotubes dispersion at a volume capacity ratio of 1:1-1:3, dispersing and controlling mixed liquid with 30-50 kHz ultrasonic waves for 30-60 minutes to obtain mixed liquid of graphene oxide and multi-walled carbon nanotubes, (iv) designing vacuum filtration device comprising conical filter flask, where an hourglass-type suction filter connector is sleeved above mouth of filter bottle, and a filter cup is connected to the suction filter connector, (v) removing filter cup when preparing the graphene oxide/multi-walled carbon nanotube composite membrane, and placing substrate membrane in middle of sand core plate to cover sand core, pouring mixture of graphene oxide and multi-walled carbon nanotubes into filter cup, turning on vacuum pump, and filtering for 2-12 hours at a pressure of 0.07-0.12 MPa, and turning off vacuum pump when mixed solution is gradually deposited to a flat, smooth, non-wetting layer raised membrane to obtain uniform, flat and wet graphene oxide/multi-walled carbon nanotube composite membrane , and (vi) taking out graphene oxide/multi-walled carbon nanotube composite membrane prepared in step (v) by drying and packaging, and drying in a vacuum drying oven to obtain finished product.