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Method for preparing compound tungstate by adopting self-sacrificial template

A sacrificial template and tungstate technology, applied in the field of materials science, can solve problems such as difficult to control, complex hydrothermal products, and complex hydrolysis behavior of tungstate radicals, etc., and achieve good morphology and simple technical solutions.

Active Publication Date: 2019-05-24
辽宁宏拓新材料科技(集团)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hydrolysis behavior of tungstate in solution is complex and difficult to control, and the resulting hydrothermal products are complex, requiring multiple experimental controls to find a suitable precursor

Method used

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  • Method for preparing compound tungstate by adopting self-sacrificial template
  • Method for preparing compound tungstate by adopting self-sacrificial template
  • Method for preparing compound tungstate by adopting self-sacrificial template

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A self-sacrificing template to prepare compound tungstate NaLa (WO 4 ) 2 method, including the following steps:

[0046] Step 1, layered compound La 2 (OH) 4 SO 4 2H 2 Preparation of O:

[0047] (1) Lanthanum nitrate hexahydrate (La(NO 3 ) 3 ·6H 2 O) Mix well in deionized water to prepare La 3+ Rare earth nitrate (La(NO) with a concentration of 0.03mol / L 3 ) 3 ) solution.

[0048] (2) ammonium sulfate particles ((NH 4 ) 2 SO 4 ) dissolved in rare earth nitric acid (La(NO 3 ) 3 ) solution to form a mixed solution, wherein the ammonium sulfate particles ((NH 4 ) 2 SO 4 ) and rare earth nitrate (La(NO 3 ) 3 ) solution is added in molar ratio, SO 4 2- : La 3+ = 0.5;

[0049] (3) Add ammonia water to the mixed solution, adjust the pH of the solution to 10, and continue to stir for 30 minutes to obtain a uniform suspension; react the uniform suspension to obtain the product; wherein, the reaction temperature is 4 ° C, and the reaction The time is 72h...

Embodiment 2

[0056] A self-sacrificing template to prepare compound tungstate NaCe (WO 4 ) 2 method, including the following steps:

[0057] Step 1, layered compound Ce 2 (OH) 4 SO 4 2H 2 Preparation of O:

[0058] (1) Cerium nitrate hexahydrate (Ce(NO 3 ) 3 ·6H 2 O) Mix well in deionized water and prepare Ce 3+ Rare earth nitrate (Ce(NO 3 ) 3 ) solution;

[0059] (2) ammonium sulfate particles ((NH 4 ) 2 SO 4 ) dissolved in rare earth nitric acid (Ce(NO 3 ) 3 ) solution to form a mixed solution, wherein the ammonium sulfate particles ((NH 4 ) 2 SO 4 ) and rare earth nitrate (Ce(NO 3 ) 3 ) solution is added in molar ratio, SO 4 2- : Ce 3+ = 10;

[0060] (3) Under the protection of an argon atmosphere, add ammonia water to the mixed solution, adjust the pH of the solution to 8.5, and continue to stir for 30 minutes to obtain a uniform suspension; react the uniform suspension to obtain a product; wherein, the The reaction temperature is 120°C, and the reaction time ...

Embodiment 3

[0067] A self-sacrificing template to prepare compound tungstate NaGd(WO 4 ) 2 method, including the following steps:

[0068] Step 1, layered compound Gd 2 (OH) 4 SO 4 2H 2 Preparation of O:

[0069] (1) Gadolinium nitrate hexahydrate (Gd(NO 3 ) 3 ·6H 2 O) Mix well in deionized water to prepare Gd 3+ Rare earth nitrate (Gd(NO 3 ) 3 ) solution;

[0070] (2) ammonium sulfate particles ((NH 4 ) 2 SO 4 ) dissolved in rare earth nitric acid (Gd(NO 3 ) 3 ) solution to form a mixed solution, wherein the ammonium sulfate particles ((NH 4 ) 2 SO 4 ) and rare earth nitrate (Gd(NO 3 ) 3 ) solution is added in molar ratio, SO 4 2- :Gd 3+ = 5;

[0071] (3) Add ammonia water to the mixed solution, adjust the pH of the solution to 8, and continue to stir for 15 minutes to obtain a uniform suspension; react the uniform suspension to obtain the product; wherein, the reaction temperature is 50 ° C, and the reaction The time is 36h;

[0072] Step 2, product cleaning a...

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Abstract

The invention relates to a method for preparing compound tungstate by adopting a self-sacrificial template, which comprises the following steps of: preparing a rare earth nitrate solution with corresponding concentration, dissolving ammonium sulfate particles in the rare earth nitrate solution according to the proportion to form a mixed solution, adjusting the pH value of the mixed solution, continuously stirring to obtain a uniform suspension, reacting to obtain a product, performing centrifugal separation on the product immediately after the reaction is finished to obtain layered compound nano-sheet RE2(OH)4SO4 2H2O, adding the layered compound nano-sheet RE2(OH)4SO4 2H2O into an A2WO4 solution, uniformly mixing, performing hydrothermal reaction, cooling the reaction product to room temperature, performing centrifugal separation, and drying to obtain solid powder-state tungstate ARE(WO4)2. According to the method for preparing compound tungstate by adopting the self-sacrificial template, the layered compound nano-sheet is used as the self-sacrificial template, so that the formation of REPO4 1.5H2O is facilitated; a target product is directly obtained after hydrothermal treatment;synthesis parameters are wide; the target product can be obtained without fine regulation and control; when the prepared compound tungstate is applied to the preparation of fluorescent powder, the fluorescent powder can be widely applied.

Description

Technical field: [0001] The invention belongs to the technical field of material science, and in particular relates to a method for preparing compound tungstate by using a self-sacrificing template. Background technique: [0002] Compound tungstate ARE(WO 4 ) 2 (A=Li + , Na + , K + , RE is a rare earth element) and CaWO 4 It has the same structure type, belongs to the tetragonal scheelite structure, has stable physical and chemical properties, and has excellent thermal conductivity and mechanical properties. It is a very good laser crystal material matrix, and it can also be used as a good matrix material for display phosphors and fluorescent lamp phosphors. ARE(WO 4 ) 2 It has excellent performance when doped with fluorescent ions as a host material. ARE(WO 4 ) 2 The absorption ability in the ultraviolet region is strong, and the tungstate in the matrix will have a strong sensitization effect on the doped rare earth ions, which is conducive to energy transfer and...

Claims

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Application Information

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IPC IPC(8): C01G41/00C09K11/78
Inventor 王雪娇王秋实朱革张伟张蓉瑜姚传刚
Owner 辽宁宏拓新材料科技(集团)有限公司