▎ 摘　　要

NOVELTY - Preparation of graphene synergistic sol involves (s1) adding flake graphite into mixed acid solution, soaking for 3-4 hours, (s2) adding 5-8 g/L intercalation agent to the mixed acid solution, reacting at 45-55°C for 4-6 hours, washing until the pH is 4.6-5.3, ultrasonically dispersing for 1-2 hours, drying at 100°C to obtain graphene oxide, (s3) putting graphene oxide in the reducing solution, reacting for 2-3 hours to obtain graphene, and (s4) adding 300-400 g/L graphene in dispersing solution, adding 2-3 g/L dispersant, 8-12 g/L organic bentonite, and ultrasonically treating for 30-40 minutes to obtain graphene synergistic sol. In step (s2), the intercalation agent comprises phosphoric anhydride, acetic acid, and sodium bicarbonate in a mass ratio of 1:0.4-0.6:2-3. The dispersant comprises fatty acid polyethylene glycol ether and polyacrylamide in a mass ratio of 1:0.56-0.65. USE - Preparation of graphene synergistic sol used for improving soil quality. ADVANTAGE - The prepared graphene synergistic sol has strong adsorption capacity, enhances the long-term preservation of nutrients by soil and controlling the loss of nutrient volatilization on the ground and deep seepage.