Method for preparing alpha iron sesquioxide

Abstract

The invention discloses a method for preparing alpha iron sesquioxide. The method comprises the following steps: S1, preparing an aqueous solution of potassium ferricyanide; S2, carrying out a microwave hydrothermal reaction on the aqueous solution of potassium ferricyanide at a temperature of 170-220 DEG C for at least half an hour so as to obtain a solid-liquid mixture; and S3, performing solid-liquid separation on the solid-liquid mixture, and cleaning and drying a solid obtained, thereby obtaining alpha iron sesquioxide. According to the method disclosed by the invention, potassium ferricyanide serves as a raw material, the ferricyanide ion in potassium ferricyanide serves as an iron source, and nitrogen atoms in cyanogens are selectively adsorbed on the surfaces of particles due to lone pair electrons in the cyanogens, so that hexagonal flower-like crystal alpha iron sesquioxide is obtained. Compared with a traditional preparation method for regulating particle growth by using sulfate, chloride and other soluble iron sources as raw materials and adding at least one modifier, the method disclosed by the invention is simple in preparation process, and the preparation cost is reduced; the reaction conditions are easily controlled, and large-scale industrial production is realized; and meanwhile, the product is high in purity, high in yield, uniform in particle size and stablein performance.

Description

Technical field [0001] The invention belongs to the technical field of metal oxide preparation, and specifically relates to a method for preparing α-type ferric oxide. Background technique [0002] Alpha-crystal ferric oxide is a common metal oxide that is ubiquitous in nature and can be easily obtained under laboratory conditions. It has strange characteristics and is widely used in semiconductors, magnetic recording materials, and enhanced magnetic resonance. Imaging contrast, tissue repair, cancer diagnosis and treatment, biological fluid detoxification, electrochromic devices, lithium battery electrodes, drug carriers, photocatalytic hydrogen production and many other fields. [0003] At present, the preparation method of α-crystalline ferric oxide has become one of the research hotspots in the field of materials science. The traditional preparation of α-crystalline ferric oxide is mainly high-temperature sintering, but the particle size and morphology cannot be effectively per...

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Problems solved by technology

In addition, there is also a domestic report of using microwave method to prepare sheet-like particles to self-assemble into flower-like particles for adsorption (Journal of Zhejiang University (English Edition) Series A: Applied Physics and Engineering: 2014,15(8):671-680); The process is simple, but it is difficult to prepare α-crystalline ferric oxide particles with hierarchical structure

[0005] When the α crystal form of ferric oxide is used as a catalytic material and red pigment, it will affect its catalytic properties and appearance color due to different shapes, thus affecting its application; however, currently, for a specific α crystal form of ferric oxide growth and regulation methods, but no reports have been seen, such as no reports for graded hexagonal flower-shaped iron oxide particles

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