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Three-dimensional layered chromium hydroxide monohydrate nanosphere and preparation method thereof

A chromium hydroxide and nanosphere technology, applied in the field of material science, to achieve the effects of good controllability, strong acid and alkali resistance, and high stability

Pending Publication Date: 2022-07-08
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, so far, there are still few reports on the research on new chromium hydroxide materials with special morphology and function.

Method used

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  • Three-dimensional layered chromium hydroxide monohydrate nanosphere and preparation method thereof
  • Three-dimensional layered chromium hydroxide monohydrate nanosphere and preparation method thereof
  • Three-dimensional layered chromium hydroxide monohydrate nanosphere and preparation method thereof

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preparation example Construction

[0024] One aspect of the embodiments of the present invention provides a method for preparing three-dimensional layered chromium hydroxide monohydrate nanospheres, comprising: preparing a neutral or alkaline aqueous solution containing a hexavalent chromium compound and a reducing agent as a reaction solution, and making the The reaction solution is subjected to a hydrothermal reaction at a temperature of 200° C. to 280° C., and is then subjected to post-treatment to obtain three-dimensional layered chromium hydroxide monohydrate nanospheres.

[0025] Further, the concentration of the hexavalent chromium compound contained in the reaction solution is below the saturation concentration of the hexavalent chromium compound. Preferably, the concentration of the hexavalent chromium compound contained in the reaction solution is 1-2 mol / L.

[0026] Further, the molar ratio of the hexavalent chromium compound and the reducing agent in the reaction solution is 1:1-1.5.

[0027] Furth...

Embodiment 1

[0044] Example 1: 25g sodium chromate, 5g sodium carbonate, 3g sodium hydroxide were added to a certain amount of water to configure a 100ml aqueous solution, then 2g citric acid was added, and the pH value of the solution was about 14 at this time; the configured solution was transferred. to a 150ml stainless steel autoclave, heated to 280°C, and reacted for 12h. Then, the obtained slurry was naturally cooled to room temperature, and after suction filtration, it was fully washed with water until neutral, and then freeze-dried to obtain a product, namely three-dimensional layered chromium hydroxide monohydrate nanospheres, whose appearance is as follows Figure 1-Figure 4 As shown, the XRD characterization results are as follows Figure 5 shown, indicating that the resulting product consists of chromium hydroxide monohydrate.

Embodiment 2

[0045] Embodiment 2: 25g potassium chromate, 10g potassium carbonate are added to a certain amount of water to configure into a 100ml aqueous solution, then 2g acetic acid is added, and the pH value of the solution is about 12 at this time; The configured solution is transferred to a 150ml stainless steel autoclave , heated to 260°C, and reacted for 15h. Then, the obtained slurry is naturally cooled to room temperature, after suction filtration, fully washed with water until neutral, and freeze-dried to obtain a product, namely three-dimensional layered chromium hydroxide monohydrate nanospheres.

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Abstract

The invention discloses a three-dimensional layered chromium hydroxide monohydrate nanosphere and a preparation method thereof. The preparation method comprises the following steps: preparing a neutral or alkaline aqueous solution containing a hexavalent chromium compound and a reducing agent as a reaction solution, carrying out a hydrothermal reaction on the reaction solution at 200-280 DEG C, and carrying out post-treatment to obtain the three-dimensional layered chromium hydroxide monohydrate nanospheres. The three-dimensional layered chromium hydroxide monohydrate nanosphere has a unique microstructure, controllable size and strong acid and alkali resistance, has a large specific surface area and abundant surface hydroxyl groups, has the advantages of good dispersibility, high stability, good filtration performance and the like, has a wide application prospect, is simple in preparation process and easy to implement, and is suitable for industrial production. The cost is low, the controllability is good, and the requirements of industrial production can be well met.

Description

technical field [0001] The invention relates to a chromium hydroxide product, in particular to a three-dimensional layered monohydrate chromium hydroxide nanosphere and a preparation method thereof, belonging to the field of material science. Background technique [0002] Due to the unique electronic structure of trivalent chromium, many trivalent chromium compounds are non-toxic and often have other special properties, so they are often used as special functional materials in catalysis, biomedicine and other fields. [0003] Taking chromium hydroxide as an example, as an amphoteric hydroxide, it is currently mainly used to prepare chromium pigments and chromium salts. However, if chromium hydroxide is given a special microstructure, it may show some unique properties, which should make an important contribution to the application of trivalent chromium compounds in the field of material chemistry. [0004] However, until now, the research on novel chromium hydroxide materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G37/00B82Y40/00
CPCC01G37/00B82Y40/00C01P2002/22C01P2004/50C01P2004/62C01P2004/61C01P2004/03C01P2002/72Y02W10/37
Inventor 李波张波梁建李武冯海涛董亚萍
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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