▎ 摘　　要

NOVELTY - Synergistically treating high-salt organic wastewater using graphene nitride composite nanofiber membrane photothermal photocatalysis comprises preparing graphene nitride composite nanofiber membrane by e.g. adding polymer particles to the solvent, stirring for 2 hours at heating or normal temperature to obtain transparent gel solution having concentration of 6-9%, providing graphene nitride, adding into transparent gel solution, sonicating for 120 minutes at 20 kHz, placing on a magnetic stirrer, stirring for 30 minutes at 600 revolutions/minute to obtain uniform graphene nitride to obtain mixed gel solution, introducing mixed gel solution into high-voltage electrostatic spinning device, adjusting power supply voltage to 15-20 kV, setting spinning solution flow rate to 1 ml/hour, receiving distance to 15 cm to obtain a stable and continuous jet, and controlling temperature of the spinning process at 25 plus minus 5 degrees C, and the humidity at 35 plus minus 5%. USE - The method is useful for synergistically treating high-salt organic wastewater using graphene nitride composite nanofiber membrane photothermal photocatalysis. ADVANTAGE - The method has removal rate of organic pollutants is more than 99.9%. The membrane: has broad spectrum absorption, high desalination efficiency, rapid removal of organic pollutants, strong stability; and suitable in fields of high salt water and sea water desalination, industrial high salt organic wastewater and salt water purification. DETAILED DESCRIPTION - Synergistically treating high-salt organic wastewater using graphene nitride composite nanofiber membrane photothermal photocatalysis comprises preparing graphene nitride composite nanofiber membrane by (1) adding polymer particles to the solvent, stirring for 2 hours at heating or normal temperature to obtain transparent gel solution having concentration of 6-9%, (2) providing graphene nitride, adding into transparent gel solution, sonicating for 120 minutes at 20 kHz, placing on a magnetic stirrer, stirring for 30 minutes at 600 revolutions/minute to obtain uniform graphene nitride to obtain mixed gel solution, (3) introducing mixed gel solution into high-voltage electrostatic spinning device, adjusting power supply voltage to 15-20 kV, setting spinning solution flow rate to 1 ml/hour, receiving distance to 15 cm to obtain a stable and continuous jet, controlling temperature of the spinning process at 25 plus minus 5 degrees C, and the humidity at 35 plus minus 5%, (4) collecting the fiber membrane on the aluminum foil of the receiving plate, after 6-8 hours, when the thickness of the fiber membrane reaches 0.10-0.15 mm, then stop spinning, treating obtained graphene nitride composite nanofiber membrane in a muffle furnace at 150-180 degrees C for 30 minutes, cooling to room temperature and storing, peeling the obtained graphene nitride composite nanofiber membrane from the aluminum foil, cutting into a 5 cm diameter disc, adopting use of 300 W xenon lamp as a solar light source simulator, adding AM 1.5 filter to simulate solar radiation, adopting use of optical power meter to determine that the light intensity is 1 kW/m2, measuring 100 ml simulated high-salt organic wastewater containing different concentrations of organic pollutants and different salinities in a glass beaker, covering the entire surface of the water with the nitrided graphene composite nanofiber membrane, placing in the simulated sunlight to react, collecting evaporative condensed water, sampling, analyzing salinity and organic concentration of condensed water regularly, and determining the water production rate.