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The application discloses a method for promoting As oxidation by activating goethite with antibiotic molecules, and comprises the following steps: S1, goethite preparation; S2, adjusting the pH of a solution containing antibiotic molecules and trivalent arsenic to 5.5-6.5, adding goethite, and carrying out reaction in dark at 23-27 DEG C and 150-190 rpm for 2-72 h to realize the activation of goethite by antibiotic molecules and further complete As oxidation; wherein the concentration of antibiotic molecules in the solution is 45-55 mu M, the concentration of trivalent arsenic is 2.67 mu M, and the adding ratio of goethite to the solution to be treated is 30-50 mg:20 ml; the application firstly proposes that antibiotic molecules can complex and reduce the surface Fe(III) of goethite to generate Fe(II), further promotes the oxidation of As(III), and provides a brand-new treatment mode for the pollution conversion of composite pollutants.

The application discloses a method for preparing ecological restoration soil by repairing contaminated spoil through regeneration, and comprises the following steps: mixing dry straw powder and bimetallic alkali liquor, stirring and drying, pyrolyzing under a protective atmosphere at a temperature above 500 DEG C to obtain modified biochar material; mixing the modified biochar material with microbial liquid, oscillating and adsorbing, and freeze-drying to obtain carbon-based biological composite material; mixing the carbon-based biological composite material with shield spoil to obtain improved shield spoil; and mixing the improved shield spoil with organic fertilizer to obtain ecological restoration soil; the method removes toxic and harmful components in the shield spoil through biodegradation, the modified biochar improves the structure of the shield spoil, and the specific component compound fertilizer is used, so that the shield spoil is recycled, and the shield spoil-based ecological restoration soil is obtained.