Preparation method of rhombohedral alpha type ferric oxide

Abstract

The invention discloses a preparation method of rhombohedral alpha type ferric oxide. The preparation method comprises the following steps of S1, preparing a water-soluble ferric salt water solution;S2, adding a phosphine organic matter into the water-soluble ferric salt water solution, and obtaining a reaction mixture; S3, carrying out microwave hydrothermal reaction on the reaction mixture for0.5h to 2.0h at 180 DEG C to 220 DEG C, and obtaining a solid-liquid mixture; S4, carrying out solid-liquid separation on the solid-liquid mixture, and cleaning and drying a solid to obtain the rhombohedral alpha type ferric oxide. According to the preparation method of the rhombohedral alpha type ferric oxide provided by the invention, the water-soluble ferric salt is adopted as a raw material, the phosphine organic matter is then added, a lone pair electron carried by a phosphorus atom is utilized to be selectively adsorbed on the particle surface, and the growth rate of the particle surfaceespecially a special (104) crystal face in a specific growth direction is slowed down, so that the specific crystal face is finally exposed on the surface. According to the preparation method of therhombohedral alpha type ferric oxide provided by the invention, the reaction efficiency is high, the preparation process is simple, and the preparation cost is effectively reduced; meanwhile, the obtained product is high in purity, high in yield, uniform in particle size and stable in performance.

Description

technical field [0001] The invention belongs to the technical field of metal oxide preparation, and specifically relates to a preparation method of rhombohedral α-type ferric oxide. Background technique [0002] α crystalline ferric oxide is a common metal oxide that exists in nature and can be easily obtained under laboratory conditions. It has unique characteristics and is widely used in semiconductors, magnetic recording materials, and enhanced magnetic resonance. Imaging contrast, tissue repair, cancer diagnosis and treatment, detoxification of biological fluids, electrochromic devices, lithium battery electrodes, drug carriers, and photocatalytic hydrogen production and many other fields. However, when used as a catalytic material and a red pigment, the α-crystalline ferric oxide will affect its catalytic properties and appearance color due to its different morphology, thereby affecting its application. [0003] At present, the preparation method of α-crystalline ferri...

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Problems solved by technology

Such as Li Kunyu from Hebei University of Technology (Li Kunyu, Li Lin, Li Yinhui, Li Liang, Chen Jianxin. Hydrothermal synthesis and adsorption performance of hierarchical flower-shaped iron oxide microspheres [J]. Guangzhou Chemistry. 2016, 04(41): 18- 22.) Using hexamethylenetetramine, ferrous sulfate and sodium citrate as raw materials, a graded flower-like Fe with low crystallinity was prepared by hydrothermal synthesis 2 o 3 Microspheres, and used for simulation research on the removal of lead ions in water; however, there are many types of raw materials used in its preparation, and the preparation process is relatively complicated; for example, CN201710120611.3 discloses that ferric nitrate is dissolved in ethylene glycol to prepare α Crystalline ferric oxide nanosheets; the process is simple, but it is difficult to prepare alpha crystal ferric oxide particles with hierarchical structure

At the same time, 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] But, the method for the α crystal form ferric oxide of specific rhombohedron has not been reported at present

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