▎ 摘　　要

NOVELTY - A densely coated three-dimensional reduced graphene oxide-based Fenton catalyst with ultra-small ferric oxide is prepared by adding graphene oxide to deionized water, ultrasonicating to obtain 0.5-2 mg/mL graphene oxide dispersion, adding ferric chloride hexahydrate according to mass-volume ratio of (0.4-0.8 g):30 mL, stirring to obtain solution I, adding sodium bicarbonate to adjust pH value to 8-12, adding 10-30 mmol/L ascorbic acid solution according to volume ratio of 10:(25-35), stirring, obtaining solution II, performing hydrothermal reaction at 160-200 degrees C, cooling to obtain black hydrogel, centrifugal washing with ethanol, washing with deionized water to neutral, refrigerating at - 20 to - 15 degrees C, and freeze drying. USE - Method for preparing densely coated three-dimensional reduced graphene oxide-based Fenton catalyst with ultra-small ferric oxide. ADVANTAGE - The product has significantly improved catalytic performance for degrading tetracycline hydrochloride for 20 minutes with 100% degradation rate, and has excellent cycle stability.