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Preparation method of single-phase cobalt nitrate nanomaterial

A technology of cobalt nanometer and niobate, applied in chemical instruments and methods, cobalt compounds, inorganic chemistry, etc., can solve the problems of niobate particle growth, hard agglomeration, niobate grain growth, etc.

Inactive Publication Date: 2018-01-09
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the high-temperature solid-phase method, since most of the synthetic raw materials are solid-phase oxides or metal powders, it is easy to cause the growth of niobate particles.
For the wet chemical precipitation method, when a strong base (containing hydroxide) is used as a precipitant, it is often easy to introduce impurity elements brought by the base to form an impurity phase; in addition, the hydroxide precipitates form oxides after heating During the process, more serious hard agglomeration of hydroxide will occur, which will easily cause the second growth of niobate grains

Method used

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  • Preparation method of single-phase cobalt nitrate nanomaterial
  • Preparation method of single-phase cobalt nitrate nanomaterial
  • Preparation method of single-phase cobalt nitrate nanomaterial

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preparation example Construction

[0021] The invention provides a method for preparing a single-phase cobalt niobate nanomaterial, comprising:

[0022] S1: Dissolving niobium pentachloride and cobaltous chloride in an alcohol solution at a stoichiometric ratio of 2:1 to obtain solution A; dissolving ammonium carbonate in an aqueous solution to obtain solution B. The alcohol solution is one or more of methanol, ethanol, propanol and butanol. The volume ratio of the alcohol solution to the aqueous solution is 2:1˜10:1. The molar concentrations of the niobium pentachloride, cobaltous chloride and ammonium carbonate are all in the range of 1-1000 mmol / L (millimole per liter). Preferably, the niobium pentachloride and cobaltous chloride are dissolved in the alcohol solution by mechanical stirring or ultrasonic stirring, and the ammonium carbonate is dissolved in the aqueous solution by mechanical stirring or ultrasonic stirring.

[0023] S2: Mix solution A and solution B with each other, and stir at room temperat...

Embodiment 1

[0032] Niobium pentachloride and cobaltous chloride are fully dissolved in 300 milliliters of ethanol solutions according to the stoichiometric ratio of 2:1 to obtain solution A, wherein the molar concentration of cobaltous chloride is 40mmol / L; 4 grams of ammonium carbonate are fully Solution B was obtained by dissolving in 100 ml of aqueous solution. Under the premise of sufficient stirring, the solution B was slowly added to the solution A and mixed with each other; after mixing, the mixed solution was stirred at room temperature for 0.5 h to obtain a suspension. The suspension was centrifuged to obtain a powder. The powder was washed 5 times with secondary deionized water and absolute ethanol. Put the cleaned powder into a drying oven, and dry it for one day at a temperature of 50°C. The dried powder was calcined at 700° C. for 8 h to crystallize the powder to obtain a single-phase cobalt niobate nanomaterial.

[0033] see figure 1 , figure 1 The X-ray diffraction pat...

Embodiment 2

[0035] Niobium pentachloride and cobaltous chloride are fully dissolved in 500 milliliters of ethanol solutions according to the stoichiometric ratio of 2:1 to obtain solution A, wherein the molar concentration of cobaltous chloride is 30mmol / L; 3.5 grams of ammonium carbonate are fully Solution B was obtained by dissolving in 200 ml of aqueous solution. Under the premise of sufficient stirring, the solution B was slowly added to the solution A and mixed with each other; after mixing, the mixture was stirred at room temperature for 1 h to obtain a suspension. The suspension was centrifuged to obtain a powder. The powder was washed 5 times with secondary deionized water and absolute ethanol. Put the cleaned powder into a drying oven and dry it at 60°C for one day. The dried powder was calcined at 700° C. for 10 h to crystallize the powder to obtain a single-phase cobalt niobate nanomaterial.

[0036] It can be seen from the experimental test that the single-phase cobalt niob...

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Abstract

The invention provides a preparation method of a single-phase cobalt nitrate nanomaterial. The preparation method comprises the following steps: dissolving columbium pentachloride and cobaltous chloride into an alcohol solution in a stoichiometric ratio of 2 to 1, so as to obtain a solution A; dissolving ammonium carbonate into a water solution, so as to obtain a solution B; mutually mixing the solution A and the solution B, stirring at the room temperature for a period of time, so as to obtain suspension liquid; carrying out centrifugal treatment on the suspension liquid, so as to obtain powder; drying the powder; and calcining the dried powder at 700-1000 DEG C for 6-12 hours, so as to obtain the single-phase cobalt nitrate nanomaterial. The single-phase cobalt nitrate nanomaterial prepared by virtue of the preparation method does not have an impure phase.

Description

technical field [0001] The invention relates to the field of inorganic material chemistry, in particular to a preparation method of a single-phase cobalt niobate nanometer material. Background technique [0002] Niobate ceramic materials have excellent dielectric properties, can be used as a microwave dielectric ceramic, and can also be used as catalytic materials for various reactions. They have good application potential in the fields of electronic component materials, catalytic materials, and electrode materials. A wide range of research interests. [0003] The grain size of the niobate directly affects the properties of the material. At present, most niobate materials are synthesized by high-temperature solid-phase method or wet chemical precipitation method. For the high-temperature solid-phase method, since most of the synthesized raw materials are solid-phase oxides or metal powders, it is very easy to cause the growth of niobate particles. For the wet chemical pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/00
Inventor 李勃高爽
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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