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Method for preparing manganese tungstate nano-sheets by molten salt method

A technology of manganese tungstate nanometer and molten salt method, which is applied in nanotechnology, chemical instruments and methods, manganese compounds, etc., to achieve the effects of no environmental pollution, simple equipment, and easy control of conditions

Inactive Publication Date: 2014-05-07
LUOYANG INST OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the currently used preparation methods cannot meet this requirement

Method used

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  • Method for preparing manganese tungstate nano-sheets by molten salt method
  • Method for preparing manganese tungstate nano-sheets by molten salt method

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Experimental program
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Effect test

Embodiment 1

[0024] Step 1. Make sodium tungstate into a solution and adjust the WO in the solution 4 2- The ion concentration is 0.5mol / L;

[0025] Step 2, manganese chloride is made into solution, adjusts the Mn in the solution 2+ The ion concentration is 0.5mol / L;

[0026] Step 3. Mix the sodium tungstate aqueous solution prepared in step 1 with the manganese chloride aqueous solution prepared in step 2, wherein the molar ratio of sodium tungstate and manganese chloride is 1:1, and stir the obtained precipitation solution for 10 minutes Afterwards, suction filtration is carried out, and the precursor is obtained after drying;

[0027] Step 4, fully grind the precursor and lithium nitrate obtained in step 3, wherein the weight ratio of the precursor to lithium nitrate is 1:3, put the mixture in a corundum crucible, then put the crucible into an electric furnace, and heat After keeping warm at ℃ for 5 hours, take it out and cool it down;

[0028] Step 5. Finally, the cooled sample wa...

Embodiment 2

[0031] Step 1. Make sodium tungstate into a solution and adjust the WO in the solution 4 2- The ion concentration is 1.2mol / L;

[0032] Step 2, manganese chloride is made into solution, adjusts the Mn in the solution 2+ The ion concentration is 1.2mol / L;

[0033] Step 3. Mix the sodium tungstate aqueous solution prepared in step 1 with the manganese chloride aqueous solution prepared in step 2, wherein the molar ratio of sodium tungstate and manganese chloride is 1:1, and stir the obtained precipitation solution for 20 minutes Afterwards, suction filtration is carried out, and the precursor is obtained after drying;

[0034] Step 4, fully grind the precursor and lithium nitrate obtained in step 3, wherein the weight ratio of the precursor to lithium nitrate is 1:6, put the mixture in a corundum crucible, then put the crucible into an electric furnace, and heat After keeping warm at ℃ for 3 hours, take it out and cool it down;

[0035] Step 5. Finally, the cooled sample wa...

Embodiment 3

[0037] Step 1. Make sodium tungstate into a solution and adjust the WO in the solution 4 2- The ion concentration is 2.0mol / L;

[0038] Step 2, manganese chloride is made into solution, adjusts the Mn in the solution 2+ The ion concentration is 2.0mol / L;

[0039] Step 3. Mix the sodium tungstate aqueous solution prepared in step 1 with the manganese chloride aqueous solution prepared in step 2, wherein the molar ratio of sodium tungstate and manganese chloride is 1:1, and stir the obtained precipitation solution for 30 minutes Afterwards, suction filtration is carried out, and the precursor is obtained after drying;

[0040] Step 4. Fully grind the precursor and lithium nitrate obtained in step 3. The weight ratio of the precursor to lithium nitrate is 1:10. After keeping warm at ℃ for 2 hours, take it out and cool it down;

[0041] Step 5. Finally, the cooled sample was washed with deionized water and then dried to obtain well-crystallized manganese tungstate nanosheets....

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Abstract

The invention discloses a method for preparing manganese tungstate nano-sheets by a molten salt method. The method disclosed by the invention comprises the steps of respectively preparing sodium tungstate and manganese chloride into solutions, stirring, and then performing suction filtration and drying; then grinding with lithium nitrate, placing into a crucible, performing heat preservation for 2h-6h at the temperature of 300-400 DEG C, taking out and cooling. The method disclosed by the invention has the advantages of simple process and easiness in industrial production; moreover, the obtained manganese tungstate nano-sheets have the advantages of high purity, novel and unique nano-crystals and the like.

Description

technical field [0001] The invention relates to a preparation method of manganese tungstate nanosheets, in particular to a method for preparing manganese tungstate nanosheets by a molten salt method. Background technique [0002] Manganese tungstate is an important functional material with wolframite structure, which has broad application prospects in photoluminescence, optical fiber, multiferroic material, photocatalyst, scintillator, humidity sensor and magnetic material. [0003] At present, the methods for preparing manganese tungstate nanopowder mainly include hydrothermal method, microwave hydrothermal method, solvothermal method, precipitation method, high temperature solid phase method, etc. However, the above-mentioned several methods have certain limitations, such as: hydrothermal method and solvothermal method usually have a long reaction time, low reaction efficiency and need to add organic solvents, etc.; precipitation method and high temperature solid phase met...

Claims

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Application Information

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IPC IPC(8): C01G45/00B82Y40/00
Inventor 王永刚杨琳琳王晓峰王玉江徐国辉林海燕罗伟
Owner LUOYANG INST OF SCI & TECH
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