阅读说明：本技术 一种钼酸钡花状晶体的制备方法 (Preparation method of barium molybdate flower-like crystal ) 是由 杨琳琳 王永刚 郭少飞 李嘉诚 李何粤 王玉江 于 2020-07-01 设计创作，主要内容包括：一种钼酸钡花状晶体的制备方法,包括以下步骤：将草酸钾溶于去离子水；将硝酸钡溶于去离子水；将草酸钾水溶液和硝酸钡水溶液相混合,形成的混合物A；将钼酸钠溶于去离子水；将十六烷基三甲基溴化胺溶于去离子水；将钼酸钠水溶液和十六烷基三甲基溴化胺水溶液相混合,搅拌,得到混合液B；将混合物A和混合液B相混合,形成新的混合物C,将混合物C进行超声处理,反应生产的产物经过蒸馏水反复洗涤,然后再经过过滤、烘干,最终得到钼酸钡花状晶体。本发明提供的钼酸钡花状晶体的制备方法,具有形貌可控、操作简单、成本低廉等优点,易于工业化生产。(A preparation method of a barium molybdate flower-like crystal comprises the following steps: dissolving potassium oxalate in deionized water; dissolving barium nitrate in deionized water; mixing a potassium oxalate aqueous solution and a barium nitrate aqueous solution to form a mixture A; dissolving sodium molybdate in deionized water; dissolving hexadecyl trimethyl ammonium bromide in deionized water; mixing a sodium molybdate aqueous solution and a hexadecyl trimethyl ammonium bromide aqueous solution, and stirring to obtain a mixed solution B; and mixing the mixture A and the mixed solution B to form a new mixture C, carrying out ultrasonic treatment on the mixture C, repeatedly washing a product produced by the reaction with distilled water, and then filtering and drying to finally obtain the barium molybdate flower-shaped crystal. The preparation method of the barium molybdate flower-like crystal provided by the invention has the advantages of controllable morphology, simplicity in operation, low cost and the like, and is easy for industrial production.)

1. A method for preparing a barium molybdate flower-like crystal is characterized by comprising the following steps: the method comprises the following steps:

(1) dissolving potassium oxalate in deionized water to form a potassium oxalate aqueous solution;

(2) dissolving barium nitrate in deionized water to form a barium nitrate aqueous solution;

(3) mixing the potassium oxalate aqueous solution prepared in the step (1) with the barium nitrate aqueous solution prepared in the step (2) to obtain a mixture A formed by barium oxalate sediment and potassium nitrate solution;

(4) dissolving sodium molybdate in deionized water to form a sodium molybdate aqueous solution;

(5) dissolving hexadecyl trimethyl ammonium bromide in deionized water to form a hexadecyl trimethyl ammonium bromide aqueous solution;

(6) mixing the sodium molybdate aqueous solution prepared in the step (4) with the hexadecyl trimethyl ammonium bromide aqueous solution prepared in the step (5), stirring to obtain a mixed solution of sodium molybdate and hexadecyl trimethyl ammonium bromide, and recording the mixed solution as a mixed solution B;

(7) mixing the mixture A and the mixed solution B (wherein the molar ratio of sodium molybdate in the mixture A to barium oxalate in the mixed solution B is not less than 1:1) to form a new mixture C, carrying out ultrasonic treatment on the mixture C to generate barium molybdate crystals and sodium oxalate, repeatedly washing the barium molybdate crystals with distilled water, and then filtering and drying to finally obtain the barium molybdate flower-shaped crystals.

2. The method for preparing a barium molybdate flower-like crystal according to claim 1, wherein: in the solution obtained in the step (1), the concentration of potassium oxalate is 0.2-1.2 mol/L.

3. The method for preparing a barium molybdate flower-like crystal according to claim 1, wherein: in the solution obtained in the step (2), the concentration of barium nitrate is 0.2-1.2 mol/L.

4. The method for preparing a barium molybdate flower-like crystal according to claim 1, wherein: and (4) in the solution obtained in the step (4), the concentration of sodium molybdate is 0.2-1.2 mol/L.

5. The method for preparing a barium molybdate flower-like crystal according to claim 1, wherein: in the solution obtained in the step (5), the mass percentage concentration of the hexadecyl trimethyl ammonium bromide is 0.1-0.5%.

6. The method for preparing a barium molybdate flower-like crystal according to claim 1, wherein: the stirring time in the step (6) is 60 to 90 minutes.

7. The method for preparing a barium molybdate flower-like crystal according to claim 1, wherein: the power of the ultrasonic wave for carrying out ultrasonic treatment on the mixture C in the step (7) is 1000W-2000W.

8. The method for preparing a barium molybdate flower-like crystal according to claim 1, wherein: the time for the mixture C to be subjected to the ultrasonic treatment in the step (7) is 40 to 60 minutes.

Technical Field

The invention belongs to the field of inorganic non-metallic materials, and particularly relates to a preparation method of a barium molybdate flower-like crystal.

Background

The molybdate has excellent electrical, optical, magnetic and other properties, so that the molybdate has a wide application prospect in the aspects of luminescent materials, laser donor materials, catalytic materials, magnetic materials, antibacterial materials and the like. Barium molybdate is a very important functional material in molybdate, has excellent luminescence property, can be used as photoluminescence or laser donor material, has wide application in various fields such as photoluminescence, photocatalyst, acousto-optic filter, flame retardant material, laser donor material, scintillator and the like, and has great potential market development value. As is well known, the performance of the nano material depends on factors such as the morphology and the size of the nano crystal, and the like, so that the preparation of the barium molybdate crystal with a special morphology has very important significance in the aspects of theoretical basic research and practical application.

The increasing miniaturization and complication of nanometer devices have made higher demands on the diversification of the shapes of nanometer materials, and the performances of the nanometer materials depend on the shapes and the sizes of the nanometer materials to a great extent, so that the preparation of nanometer particles with controllable shapes and the research and development of new shapes is still the research hotspot and the focus of scientific workers nowadays.

Disclosure of Invention

Aiming at the defects and shortcomings in the prior art, the invention aims to provide a preparation method of a barium molybdate flower-like crystal.

The invention aims to realize the following technical scheme, and provides a preparation method of a barium molybdate flower-like crystal, which comprises the following steps:

(1) dissolving potassium oxalate in deionized water to form a potassium oxalate aqueous solution;

(2) dissolving barium nitrate in deionized water to form a barium nitrate aqueous solution;

(3) mixing the potassium oxalate aqueous solution prepared in the step (1) with the barium nitrate aqueous solution prepared in the step (2) to obtain a mixture A formed by barium oxalate sediment and potassium nitrate solution;

(4) dissolving sodium molybdate in deionized water to form a sodium molybdate aqueous solution;

(5) dissolving hexadecyl trimethyl ammonium bromide in deionized water to form a hexadecyl trimethyl ammonium bromide aqueous solution;

(6) mixing the sodium molybdate aqueous solution prepared in the step (4) with the hexadecyl trimethyl ammonium bromide aqueous solution prepared in the step (5), stirring to obtain a mixed solution of sodium molybdate and hexadecyl trimethyl ammonium bromide, and recording the mixed solution as a mixed solution B;

(7) mixing the mixture A and the mixed solution B (wherein the molar ratio of sodium molybdate in the mixture A to barium oxalate in the mixed solution B is not less than 1:1) to form a new mixture C, carrying out ultrasonic treatment on the mixture C to generate barium molybdate crystals and sodium oxalate, repeatedly washing the barium molybdate crystals with distilled water, and then filtering and drying to finally obtain the barium molybdate flower-shaped crystals.

Preferably, the concentration of potassium oxalate in the aqueous solution of potassium oxalate obtained in step (1) is 0.2mol/L to 1.2 mol/L.

Preferably, the concentration of barium nitrate in the barium nitrate aqueous solution obtained in step (2) is 0.2mol/L to 1.2 mol/L.

Preferably, the concentration of sodium molybdate in the sodium molybdate aqueous solution obtained in the step (4) is 0.2mol/L-1.2 mol/L.

Preferably, the concentration of the hexadecyl trimethyl amine bromide in the hexadecyl trimethyl amine bromide aqueous solution obtained in the step (5) is 0.1 to 0.5 percent by mass.

Preferably, the stirring time in step (6) is 60 to 90 minutes.

Preferably, the power of the ultrasonic waves for subjecting the mixture C to the ultrasonic treatment in the step (7) is 1000W to 2000W.

Preferably, the time for subjecting the mixture C to the ultrasonic treatment in the step (7) is 40 to 60 minutes.

The invention has the following advantages:

the preparation method of the barium molybdate flower-like crystal provided by the invention has the advantages of controllable morphology, simplicity in operation, low cost and the like, and is easy for industrial production.

The foregoing is a summary of the present invention, and for the purpose of making clear the technical means of the present invention, the present invention can be implemented according to the content of the description, and for the purpose of making the above and other objects, features, and advantages of the present invention more comprehensible, the following preferred embodiments are described in detail:

drawings

FIG. 1 is an XRD pattern of a barium molybdate flower-like crystal synthesized according to the present invention.

FIG. 2 is a Transmission Electron Microscope (TEM) photograph of a barium molybdate flower-like crystal synthesized according to the present invention.

Detailed Description

To further illustrate the technical means and effects of the present invention for achieving the intended purpose, the following detailed description of the preparation method of a barium molybdate flower-like crystal according to the present invention is provided in conjunction with the preferred examples.

A preparation method of a barium molybdate flower-like crystal comprises the following steps:

(1) dissolving potassium oxalate in deionized water to form a potassium oxalate aqueous solution, and adjusting the concentration of the potassium oxalate in the solution to be within the range of 0.2-1.2 mol/L, wherein the concentration of the potassium oxalate aqueous solution can also adopt a value outside the concentration range in other embodiments of the invention, and the reaction effect in the range is optimal;

(2) dissolving barium nitrate in deionized water to form a barium nitrate aqueous solution, and adjusting the concentration of barium nitrate in the solution to be within the range of 0.2-1.2 mol/L, wherein the concentration of the barium nitrate solution can also adopt a value outside the concentration range in other embodiments of the invention, and only the reaction effect within the range is optimal;

(3) mixing the potassium oxalate aqueous solution prepared in the step (1) and the barium nitrate aqueous solution prepared in the step (2), wherein in order to save reaction materials and optimize reaction effect, the molar ratio of the potassium oxalate aqueous solution to the barium nitrate aqueous solution is 1:1, finally obtaining barium oxalate precipitate and potassium nitrate solution, and recording a mixture formed by the barium oxalate precipitate and the potassium nitrate solution as a mixture A, although the molar ratio of the potassium oxalate aqueous solution to the barium nitrate aqueous solution can be adjusted according to needs in other embodiments of the invention;

(4) dissolving sodium molybdate in deionized water to form a sodium molybdate aqueous solution, and adjusting the concentration of sodium molybdate in the solution to be within the range of 0.2-1.2 mol/L, wherein the sodium molybdate aqueous solution can adopt a value outside the concentration range in other embodiments of the invention, and the reaction effect in the range is the best;

(5) the hexadecyl trimethyl amine bromide is dissolved in deionized water to form a hexadecyl trimethyl amine bromide aqueous solution, and the mass percent concentration of the hexadecyl trimethyl amine bromide in the solution is adjusted to be between 0.1 and 0.5 percent, of course, in other embodiments of the invention, the concentration of the hexadecyl trimethyl amine bromide aqueous solution can also be adjusted to be outside the range, and only the reaction effect in the range is the best;

(6) mixing the sodium molybdate aqueous solution prepared in the step (4) with the hexadecyl trimethyl ammonium bromide aqueous solution prepared in the step (5), adjusting the volume ratio of the added sodium molybdate aqueous solution to the hexadecyl trimethyl ammonium bromide aqueous solution to 1:1, then stirring to fully and uniformly mix the sodium molybdate aqueous solution and the hexadecyl trimethyl ammonium bromide aqueous solution, wherein the stirring time is controlled to be 60-90 minutes in the embodiment of the invention, finally obtaining a mixed solution of sodium molybdate and hexadecyl trimethyl ammonium bromide, and marking the mixed solution as a mixed solution B, although in other embodiments of the invention, the volume ratio of the sodium molybdate aqueous solution to the hexadecyl trimethyl ammonium bromide aqueous solution can be adjusted according to requirements;

(7) and mixing the mixture A and the mixed solution B to generate barium oxalate precipitate, sodium molybdate and hexadecyl trimethyl ammonium bromide so as to form a new mixture C, wherein when the mixture A and the mixed solution B are mixed, the molar ratio of the sodium molybdate in the mixture A to the barium oxalate in the mixed solution B is not less than 1:1, if the molar ratio of the sodium molybdate in the mixture A to the barium oxalate in the mixed solution B is less than 1:1, excessive barium oxalate exists in the mixture C, and because the barium oxalate is insoluble in water, the excessive barium oxalate exists in the form of impurities, so that the purity and the yield of the final barium molybdate are influenced. And then putting the mixture C into a container, putting the container into ultrasonic waves for ultrasonic treatment, reacting barium oxalate with sodium molybdate to produce sodium oxalate and barium molybdate crystals, repeatedly washing a barium molybdate crystal product generated by the reaction with distilled water, filtering and drying to finally obtain barium molybdate flower-shaped crystals, wherein a filter paper filtering mode is usually adopted during filtering. The barium molybdate flower-like crystals obtained by the method have the diameter of about 1.5-2um, wherein the barium molybdate flower-like crystals are formed by self-assembly of barium molybdate nanorods (the diameter is about 5-10nm), and the XRD pattern is shown in figure 1; FIG. 2 shows a transmission electron micrograph.

Wherein the time of ultrasonic treatment is at least 40 minutes, the time of ultrasonic treatment is controlled to be 40-60 minutes in the embodiment of the invention, and if the time is less than 40 minutes, barium molybdate flower-like crystals are not easy to obtain; if the time is more than 60 minutes, the production rate of the product is not increased, and the waste of resources is easily caused, so that the ultrasonic treatment time is controlled to be between 40 and 60 minutes in the invention.

In addition, the power of the ultrasonic wave for ultrasonic treatment is not less than 1000W, the power of the ultrasonic wave for ultrasonic treatment is controlled between 1000W and 2000W in the embodiment of the present invention, and if the power of the ultrasonic wave is less than 1000W at the time of ultrasonic treatment, barium molybdate flower-like crystals are not easily produced; if the ultrasonic wave power is more than 2000W, the yield of the product generated by the reaction is not increased, and the waste of resources is easily caused, so that the power of the ultrasonic wave is controlled between 1000W and 2000W during the ultrasonic treatment in the invention.