▎ 摘　　要

NOVELTY - Magnetic nanocomposite material comprises 87-97 %mass porous iron-nickel alloy (FeNi) and 3-13 %mass reduced graphene oxide (rGO), where the porous iron-nickel alloy nanoparticles are pinned on the surface of reduced graphene oxide, and the average particle size of the iron-nickel alloy nanoparticles is 30-40 nm, and is prepared using chemical reduction method to divalent iron ions, co-reducing the divalent nickel ions and graphene oxide to form porous iron-nickel alloy nanoparticles, which are uniformly pinned and grown on the surface of reduced graphene oxide to obtain the product. USE - The magnetic nanocomposite material is used for adsorbing and purifying industrial dyes and wastewater. ADVANTAGE - The magnetic nanocomposite material has excellent electromagnetic properties, large specific surface area and high surface activity, excellent adsorption performance for organic dyes such as methylene blue, methyl orange, Congo red and ethyl violet, abundant source of raw materials, simple technological process, and easy control of the preparation process, and is environmentally-friendly, reusable, and suitable for industrialized production. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing porous iron-nickel alloy/reduced graphene oxide magnetic nanocomposite involving (i) dissolving the graphene oxide powder in deionized water to obtain uniformly dispersed graphene oxide suspension solution with a certain concentration through ultrasonic dispersion, (ii) dissolving required amount of compounds or hydrates containing divalent iron ions in deionized water by stirring, (iii) adding required amount of compounds or hydrates containing divalent nickel ions to the aqueous solution containing iron ions prepared in the step (ii), fully stirring it until it is completely dissolved, (iv) dissolving required amount of surfactant and dissolving it in the solution obtained in step (iii), and stirring it fully until it is completely dissolved, (v) pipetting required amount of the graphene oxide suspension solution prepared in the step (i) into the solution prepared in the step (iv), stirring the mixed solution for 15-30 minutes with mechanical stirrer, at the same time, continuously passing high-purity nitrogen into the container containing the mixed solution to remove the air in the container, (vi) completely dissolving required amount of reducing agent in deionized water, placing it in a beaker of appropriate capacity, and dripping it into the container in the step (v) at a certain dropping rate, and reacting at a constant temperature for 40-80 minutes, and (vii) centrifuging the mixed solution finally obtained in the container in the step (vi), and pouring the upper layer of liquid to obtain brown or black precipitate and washing with deionized water and absolute ethanol several times to obtain the product.