Preparation method for octadecahedral alpha type ferric oxide

Abstract

The invention discloses a preparation method for octadecahedral alpha type ferric oxide, which comprises the following steps: (S1) aqueous water-soluble ferric salt solution is prepared; (S2) amide compound is added into the aqueous water-soluble ferric salt solution, so that a reaction mixture is obtained; (S3) the reaction mixture undergoes microwave hydrothermal reaction under 180 DEG C to 220DEG C for 0.5 to 2.0 hours, so that a solid-liquid mixture is obtained; (S4) the solid-liquid mixture undergoes solid-liquid separation, and the obtained solid is washed and dried, so that octadecahedral alpha type ferric oxide is obtained. According to the invention, since water-soluble ferric salt is adopted as material and then added with the amide compound, lone pair electrons carried by nitrogen atoms are utilized for being selectively adsorbed onto particle surfaces, particularly special (112) crystal faces, to retard the speed of growth along a specific growth direction, and as a result, the specific crystal faces are caused to be ultimately exposed on the surfaces. According to the invention, the reaction efficiency is high, the preparation process is simple, and the preparation cost is effectively reduced; moreover, the purity of the obtained product is high, the yield is high, the grain size is uniform, and the properties are stable.

Description

technical field [0001] The invention belongs to the technical field of metal oxide preparation, and specifically relates to a preparation method of octadecahedral 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 fer...

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Problems solved by technology

Such as Li Kunyu of Hebei University of Technology (Li Kunyu, Li Lin, Li Yinhui, Li Liang, Chen Jianxin. Hydrothermal synthesis and adsorption performance of hierarchical flower-like 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] However, there is no report on the method for the specific octadecahedral α-crystalline ferric oxide

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