▎ 摘　　要

NOVELTY - A modified biochar comprises corn straw, graphene oxide suspension, nano-silica suspension, and calcium chloride solution at ratio of (45-55) g:(10-20) mL:(15-25) mL:(15-25) mL. The graphene oxide suspension has mass percentage concentration of 0.75-1.25%. The nano-silica suspension has mass percentage concentration of 1.75-2.25%. The calcium chloride solution has mass percentage concentration of 1.25-1.75%. USE - The modified biochar is used for preparing soil repairing agent for repairing atrazine heavy metal polluted soil (claimed). ADVANTAGE - The modified biochar has porous property, large specific surface area, and good adsorption capacity and reduces activity of heavy metals and organic pollutants in soil. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (A) preparation of the modified biochar comprising mixing raw materials, performing hydrothermal carbonization treatment at 180-200 degrees C for 16-20 hours, and drying; (B) soil repairing agent comprising modified biochar, sodium alginate solution, chitosan solution, Bacillus megaterium liquid, and Rhodotorula mucilaginosa liquid solution at ratio of (3-5) g:(5-10) mL:(3-5) mL:(30-45) mL:(25-35) mL; and (C) preparation of soil repairing agent comprising mixing raw materials.