▎ 摘　　要

NOVELTY - Nitrate-polluted water containing nitrogen content of 25-100 mg/L and sodium content of 0.1-1 g/L, titanium-graphene electrode as cathode and titanium-platinum electrode as anode are subjected to an electrolytic cell, such that the distance between cathode and anode is 5-20 mm. The electrolysis process is carried out at 0.2-3 A for 0- 300 minutes, and nitrate in the cathode is reduced to nitrogen gas, ammonia or nitrite. USE - Method of removing nitrate in underground water (claimed). ADVANTAGE - The method efficiently removes nitrate in underground water without using other additional device. DETAILED DESCRIPTION - Nitrate-polluted water containing nitrogen content of 25-100 mg/L and sodium content of 0.1-1 g/L, titanium-graphene electrode as cathode and titanium-platinum electrode as anode are subjected to an electrolytic cell, such that the distance between cathode and anode is 5-20 mm. The electrolysis process is carried out at 0.2-3 A for 0- 300 minutes, and nitrate in the cathode is reduced to nitrogen gas, ammonia or nitrite. Titanium-graphene electrode is manufactured by adding flake graphite powder into a beaker, stirring under ice water-bath, adding flake graphite powder, sodium nitrite and 43.5 mg/mL sulfuric acid, adding potassium manganate, removing the ice bath, heating to 35 degrees C, heat-preserving for 30 minutes, gradually adding flake graphite, stirring for 15 minutes, adding 3% hydrogen peroxide aqueous solution, centrifuging the precipitate to pH of 3-4, lyophilizing, obtaining graphene oxide powder, sanding titanium plate, rinsing using deionized water, washing, processing using foam membrane electrode template, preparing 2-20 mg/L solution of graphene oxide, adding 0.02 mg/ml sodium dodecyl benzenesulfonate as surfactant, immersing titanium plate in graphene oxide solution as template, soaking for 1-30 minutes, drying naturally, forming dry foam graphene oxide film on titanium plate using solution of amphiphilic compound and naturally drying.