▎ 摘　　要

NOVELTY - Preparing graphene oxide/silicon dioxide/macromolecule polymer composite nanofiltration membrane involves paving non-woven fabric substrate on the metal plate. The surface density of the nonwoven fabric is 30-75 g/m2. Graphene oxide and nano silicon dioxide are mixed in a reaction vessel under a neutral condition 10-80 degrees C with stirring and reacting for 1-15 hours to obtain graphene oxide/silica composite which along with macromolecule polymer are dissolved in solvent to obtain the spinning solution which is injected into injection pump connected through the pipeline with spinneret. USE - Method for preparing graphene oxide/silicon dioxide/macromolecule polymer composite nanofiltration membrane (claimed). ADVANTAGE - The method enables to prepare graphene oxide/silicon dioxide/macromolecule polymer composite nanofiltration membrane which has high filtration efficiency of 96-99.66%. It has antibacterial and anti-ultraviolet function. DETAILED DESCRIPTION - Preparing graphene oxide/silicon dioxide/macromolecule polymer composite nanofiltration membrane involves paving non-woven fabric substrate on the metal plate. The surface density of the nonwoven fabric is 30-75 g/m2. Graphene oxide and nano silicon dioxide are mixed in a reaction vessel under a neutral condition 10-80 degrees C with stirring and reacting for 1-15 hours to obtain graphene oxide/silica composite which along with macromolecule polymer are dissolved in solvent to obtain the spinning solution which is injected into injection pump connected through the pipeline with the spinneret maintained at 20-50 degrees C. The spinneret is set above metal plate paved non-woven fabric. The distance between the spinneret and the metal flat plate is 15-35 cm and a high voltage is applied between the spinneret and metal plate. The spinning solution is injected at a flow rate of 0.1-3.5 ml/hour on the metal plate paved non-woven fabric to obtain graphene oxide/silicon dioxide/macromolecule polymer composite nanofiltration membrane material. The nonwoven fabric substrate on which the graphene/silicon dioxide/polymer composite nanofiltration membrane material is loaded is removed from the metal plate which is allowed to stand for 1.5-2.5 hours and then dried at 10-30 degrees C for 10-15 hours to obtain the desired graphene oxide/silicon dioxide/macromolecule polymer composite nanofiltration membrane.