▎ 摘　　要

NOVELTY - Preparation of graphene oxide with walnut shell as carbon source involves crushing walnut shell, soaking in hydrochloric acid, washing with water, and drying; mixing walnut shell powder with ferric oxide activator, grinding, and carbonizing to obtain biomass charcoal; carbonizing biomass charcoal again, cooling iron oxide powder, adding mixed powder of aluminum dioxide and activated carbon, and heating to get graphite; and mixing sulfuric acid solution and sodium nitrate, cooling, adding graphite and potassium permanganate, reacting, acidifying and stripping. USE - Method for preparing graphene oxide with walnut shell as carbon source (claimed). ADVANTAGE - The method has low production cost, rich raw material sources, and good repeatability. The graphene oxide has large size and high quality. DETAILED DESCRIPTION - Preparation of graphene oxide with walnut shell as carbon source comprises: (A) crushing walnut shell into powder with crusher, sieving with 180 mesh sieve to obtain walnut shell powder, soaking in 10% hydrochloric acid for 12-24 hours, washing with deionized water until neutral, and drying; (B) mixing walnut shell powder with ferric oxide activator, grinding in mortar, placing in high-temperature tube furnace, continuously ventilating with protective gas, carbonizing at 600 degrees C, and incubating for 1-2 hours to obtain biomass charcoal; (C) placing biomass charcoal in high-temperature tube furnace for secondary heat treatment with continuous supply of protective gas at 960 degrees C for 5-6 hours, cooling iron oxide powder, placing iron oxide powder into 100 ml small crucible, placing small crucible into 250 ml large crucible, adding mixed powder of aluminum dioxide and activated carbon at ratio of 1:1, covering with lid, and heating again at 1200 degrees C for 2-3 hours to get graphite; and (D) taking 23 mL 98% sulfuric acid solution and 0.5 g sodium nitrate, mixing uniformly, cooling in ice-water bath to 5 degrees C, constant stirring, adding 1 g graphite and 0.3 g potassium permanganate uniformly, controlling reaction temperature at 10-15 degrees C, reacting for 1-2 hours, heating to 35 degrees C, stirring continuously for 0.5-1 hour, adding 46 ml deionized water, controlling temperature of reaction solution at 98 degrees C, stirring for 15 minutes, adding 140 mL deionized water to stop reaction, adding 3 mL 30% hydrogen peroxide solution, filtering while hot, washing with hydrochloric acid, washing with deionized water until neutral, redispersing cake in water to form uniform solution, stripping for 30-120 minutes by sonication, and centrifuging at 4000-6000 revolutions/minute for 3-5 minutes to get supernatant.