▎ 摘　　要

NOVELTY - Preparing iron-nickel cyanide/reduced graphene oxide hybrid material comprises e.g. (i) mixing graphite powder with nitric acid solution and sulfuric acid solution, then ultrasonicating for 10-120 minutes, adding potassium permanganate into mixture, stirring at 20-100 degrees C for 1-10 hours, then diluting mixture with deionized water, adding hydrogen peroxide to remove excess potassium permanganate, and centrifuging to obtain graphene oxide, then washing with hydrochloric acid solution and ethanol, and carrying out dialysis is in deionized water, (ii) dissolving polyvinylpyrrolidone in graphene oxide solution, adding hydrazine hydrate into mixture, carrying out reduction reaction at 20-100 degrees C for 24 h, washing with deionized water and ethanol to obtain reduced graphene oxide, and (iii) mixing nickel(II) chloride and reduced graphene oxide in deionized water, and adding potassium ferricyanide into mixture to obtain precipitate, then centrifugally separating to obtain hybrid material. USE - The material is useful as electrochemically-converted ion exchanger in industrial-grade nuclear waste liquid cesium ion treatment (claimed). ADVANTAGE - The method is simple. DETAILED DESCRIPTION - Preparing iron-nickel cyanide/reduced graphene oxide hybrid material comprises (i) mixing 0.1-0.9 g graphite powder with 15 ml nitric acid solution and 30 ml sulfuric acid solution, then ultrasonicating under bath for 10-120 minutes, adding 0.1-6 g potassium permanganate into mixture in portions, stirring at 20-100 degrees C for 1-10 hours, then diluting mixture with 250 ml deionized water, adding 5-50 ml hydrogen peroxide (10-30%) to remove excess potassium permanganate, and centrifuging to obtain graphene oxide, then washing with 1 mol/l hydrochloric acid solution and ethanol, and carrying out dialysis is in deionized water until the pH of graphene oxide solution is neutral, (ii) dissolving 5-50 mg polyvinylpyrrolidone in 5-30 ml graphene oxide solution, diluting with 50 ml deionized water, stirring for 30 minutes, adding 1 ml hydrazine hydrate (10-100%) into mixture, carrying out reduction reaction at 20-100 degrees C for 24 h under stirring, centrifuging, and then washing with deionized water and ethanol to obtain reduced graphene oxide, and (iii) mixing 0.1-10 mmol nickel(II) chloride and 1-20 mg reduced graphene oxide in 100 ml deionized water, and adding 0.1-5 mmol potassium ferricyanide into mixture to obtain precipitate, then ultrasonically stirring for 6 hours, centrifugally separating, and then washing with deionized water and ethanol to obtain iron-nickel cyanide/reduced graphene oxide hybrid material. An INDEPENDENT CLAIM is also included for use of hybrid material as electrochemically-converted ion exchanger in industrial-grade nuclear waste liquid cesium ion treatment comprising maximum adsorption capacity of cerium ion in 1 mol/l potassium chloride solution is 292 mg.g1, and distribution coefficient is 594 L.g1.