▎ 摘　　要

NOVELTY - Preparing graphene load porous nano-oxide ferroelectric catalyst rich in oxygen vacancy comprises (1) adding 10-100 ml concentration 1-10 g/l graphene oxide dispersion, 0.05-0.5 ml 0.5-5 mol/l ligand solution, stirring for 30-120 minutes at a speed of 1000 revolutions/minutes, ultrasonically processing for 10-60 minutes to obtain mixture of graphene oxide and ligand, (2) adding 0.5-5 mol/l of metal salt solution in the mixture obtained in the step (1), stirring for 24-48 hours to obtain the graphene oxide loaded metal organic framework nano-crystalline composite dispersion, (3) centrifuging for 10-30 minutes at 10000-20000 revolutions/minutes, freezing and drying the centrifuged solid for 24-72 hours at -55degrees Celsius to obtain the graphene oxide loaded metal organic framework nanocrystalline composite material, and (4) calcining in an inert atmosphere to obtain the graphene loaded porous nano-oxide ferroelectric catalyst rich in oxygen vacancy. USE - The method is useful for preparing graphene load porous nano-oxide ferroelectric catalyst rich in oxygen vacancy. ADVANTAGE - The catalyst has a porous structure, a large specific surface area and a large amount of oxygen vacancy, is good for adsorption and activation of nitrate radical, fast reaction speed when it is used in the electro-catalytic reduction of nitrate in water, high nitrogen selectivity, enhanced chemical bonding effect between the graphene carrier and uniformly dispersed active component improves the stability of the catalyst and almost no metal ion is separated and the cycle life is long. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: use method of graphene load porous nano-oxide ferroelectric catalyst rich in oxygen vacancy comprising coating graphene load porous nano-oxide ferroelectric catalyst rich in oxygen vacancy on foamed nickel as a working electrode and carrying out catalytic reduction of electrolyte-containing nitrate solution under constant potential. (1) graphene-loaded porous nano-oxide ferroelectric catalyst rich in oxygen vacancy prepared by above method, where the Brunauer-Emmett-Teller (BET) surface area of the catalyst is 50-200 m2/g, and the particle diameter of the porous nano-ferric oxide is 5-50 etam; and