▎ 摘　　要

NOVELTY - Preparation of sodium vanadyl fluorophosphate/graphene composite material comprises dissolving ammonium dihydrogen phosphate, ammonium vanadate, sodium carbonate, and sodium fluoride at 2:2:1:1 mol ratio in graphene oxide solution to form 1 g/L stable solution A; dropwise adding 40 ml N,N-dimethylformamide solvent to solution A under stirring condition to obtain solution B; using nitric acid solution to adjust the pH of the solution B at 7; and moving the solution B to a hydrothermal kettle and heating for 10 hours at 180 degrees C, washing the obtained product with deionized water and ethanol, and drying in vacuum drying box. USE - The method is for preparation of sodium vanadyl fluorophosphate/graphene composite material used in hybrid capacitive deionization (claimed). ADVANTAGE - The cyclic adsorption and desorption of the materials to chloride ions and sodium ions can be realized by controlling the magnitude of the applied voltage and adjusting the positive and negative electrodes, and the operation is simple, no secondary pollution is caused, and the assistance of other chemical substances is not needed. The hybrid capacitive deionization device has sodium chloride adsorption capacity of 175.94 mg/g and lower energy consumption of 0.35 kWhour/kg sodium chloride. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) sodium vanadyl fluorophosphate/graphene composite material; and (2) application of the composite material in hybrid capacitive deionization comprising preparation of sodium vanadyl fluorophosphate/graphene electrode and activated carbon electrode by grinding the prepared composite material, polyvinylidene fluoride (PVDF), and acetylene black at 8:1:1 mass ratio, adding N-methylpyrrolidone (NMP) and stirring for 6-12 hours to obtain uniformly mixed slurry, coating the slurry on graphite paper collector, drying in vacuum at 60 degrees C to obtain sodium vanadyl fluorophosphate/graphene electrode, mixing and stirring activated carbon, PVDF, and acetylene black at 8:1:1 mass ratio for 6-12 hours to obtain uniformly mixed slurry, coating the slurry on graphite paper collecting electrode, vacuum drying at 60 degrees C to obtain the activated carbon electrode, assembly of the capacitance deionization device using fixing plate, silica gel gasket, collector, sodium vanadyl fluorophosphate/graphene electrode, organic glass water collecting tank, diaphragm, anion exchange membrane, and activated carbon electrode in sequence, where collector, silica gel gasket and fixing plate are used to test the desalting performance, the organic glass water collecting tank is a hollow plate provided with a water inlet and outlet for circulating water inlet, conducting desalting performance test comprising after assembling the hybrid capacitive deionization device, connecting with desalting process, conducting the desalting process using sodium chloride water collecting tank, peristaltic pump, hybrid capacitive deionization device, and conductivity meter, where each component is connected by a hose, when working, the peristaltic pump inputs the sodium chloride salt water from the sodium chloride collecting tank to the hybrid capacitive deionization device, after adsorption, the sodium chloride salt water is circulated back to sodium chloride collecting tank to be tested by conductivity meter, and reversely connecting the power supply to realize the desorption process, where the operation is consistent with adsorption.