▎ 摘　　要

NOVELTY - The preparation method of a ferrous iron doped iron-metal organic framework based composite material involves doping metal organic framework with ferrous chloride tetrahydrate, ferric chloride hexahydrate, terephthalic acid, dimethyl formamide, sodium hydroxide, graphene oxide and titanium dioxide, where the mass ratio of ferrous chloride tetrahydrate, ferric chloride hexahydrate, terephthalic acid, dimethyl formamide and sodium hydroxide is 0.1-0.5:1.015:0.58:0.16-2, the mass ratio of ferrous chloride tetrahydrate, ferric chloride hexahydrate, terephthalic acid, and graphene oxide is 0.1-0.5: 1.015: 0.58: 0.16-2: 0.05-0.1, and ferrous chloride tetrahydrate, ferric chloride hexahydrate, terephthalic acid, sodium hydroxide, graphene oxide and titanium dioxide is 0.1-0.5:1.015:0.58:0.16- 2: 0.05-0.1: 0.1-0.2, and the amount of dimethyl formamide used is 50 ml. USE - Ferrous iron-doped iron-metal organic framework-based composite material is useful in an ultrasonic catalysis system for efficiently degrading tetracycline hydrochloride (claimed). ADVANTAGE - The ferrous iron-doped iron-metal organic framework-based composite material can efficiently degrade tetracycline hydrochloride under ultrasonic irradiation. Through combining with graphene oxide and titanium oxide to form a heterojunction structure, the separation efficiency of electron-hole pairs is improved, and the utilization rate of the ultrasonic sonoluminescence effect is favorably improved. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) a preparation method of the ferrous iron doped iron-metal organic framework based composite material; and (2) use of ferrous iron-doped iron-metal organic framework-based composite material in an ultrasonic catalysis system for efficiently degrading tetracycline hydrochloride. DESCRIPTION OF DRAWING(S) - The drawing shows an X-ray diffraction pattern of the ferrous iron doped iron-metal organic framework based composite material.