Preparation method and application of zero-valent iron/graphene 3D nano-microcapsules

Abstract

The invention provides a preparation method of zero-valent iron / graphene 3D nano-microcapsules; the preparation method comprises the steps: firstly, respectively oxidating a graphite powder to obtain graphene oxide, and carrying out a hydrolysis reaction of a trivalent iron salt to obtain ferric oxyhydroxide; then treating graphene oxide and ferric oxyhydroxide by an aerosol method to obtain iron oxide / graphene 3D nano-microcapsules; and finally, carrying out high-temperature calcination on the iron oxide / graphene 3D nano-microcapsules in a hydrogen / argon environment to obtain the zero-valent iron / graphene 3D nano-microcapsules. Iron nanoparticles in the iron oxide / graphene 3D nano-microcapsules prepared by the method provided by the invention have good dispersity, are controllable in structure and size, can be stored for a long term and remain stable, and effectively avoid the defects that iron nanomaterials, especially nano zero-valent iron particles, are extremely unstable and are easily passivated and agglomerated. The zero-valent iron / graphene 3D nano-microcapsules prepared by the method can be used in the fields of dye decolorization, heavy metal adsorption and other pollution environmental remediation, as well as magnetic resonance imaging and other magnetic materials.

Description

technical field

[0001] The invention relates to the technical field of graphene self-assembly, and more specifically, to a preparation method and application of a zero-valent iron / graphene 3D nanocapsule. Background technique

[0002] Nano-sized zero-valent iron materials are cheap, easy to obtain, environmentally friendly, and have excellent catalytic performance and magnetic characteristics, and have received extensive attention in recent years. With the deepening of research, the following problems generally exist in the use of nano-zero-valent iron materials: 1) The particles are prone to deformation or even broken during the synthesis process, especially in high-temperature and high-pressure environments; Gravity, magnetism and other reasons are prone to agglomeration, so the dispersion is poor; 3) The resistance of the particles to changes in the external environment is weak, especially in environments such as strong acid and strong corrosion. At the same time, the par...

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