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Preparing method for porous metastable stable Bi2SiO5 block

A metastable and solution technology, applied in the field of materials, can solve the problems of long cycle, unfavorable popularization and application, complicated process, etc., and achieve the effect of low cost, few process steps and simple equipment

Inactive Publication Date: 2016-09-07
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To prepare porous bulk materials, the traditional method is to combine the above methods to obtain Bi 2 SiO 5 Powder, and then add various substances (such as foaming agent, binder, etc.), and obtain porous block materials through molding and heat treatment. The traditional method has a long cycle and complicated process, which is not conducive to Bi 2 SiO 5 Promoted application of

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A porous metastable Bi 2 SiO 5 The preparation method of block material, comprises the steps:

[0019] (1) Measure 50mL of absolute ethanol, weigh a certain amount of dispersant (composed of ethylenediaminetetraacetic acid, citric acid, diethylenetriaminepentacarboxylic acid, tartaric acid, ethylene glycol, polyethylene glycol, wherein poly Ethylene glycol (including polyethylene glycol 400, polyethylene glycol 4000 and polyethylene glycol 6000) is added therein, stirred and dissolved, and ethyl tetrasilicate is added therein to form solution A, and the concentration control of each component of the dispersant At 0.6mol / L.

[0020] (2) Dissolve bismuth oxide in nitric acid to form a solution. Nitric acid is added to solution A as long as it can completely dissolve bismuth oxide. Among them, Bi:Si (molar ratio)=1:3, the sum of Si ions and Bi ions : Citric acid (molar ratio) = 1:1. Sol B is obtained by adjusting the pH value to 1-3 with ammonia water (volume concentra...

Embodiment 2

[0024] A porous metastable Bi 2 SiO 5 The preparation method of block material, comprises the steps:

[0025] (1) Measure 50mL of absolute ethanol, weigh a certain amount of dispersant (composed of ethylenediaminetetraacetic acid, citric acid, diethylenetriaminepentacarboxylic acid, tartaric acid, ethylene glycol, polyethylene glycol) and add it , stirred and dissolved, and ethyl orthosilicate was added therein to form solution A, and the concentration of each component of the dispersant was controlled at 0.6mol / L.

[0026] (2) Dissolve bismuth oxide in nitric acid and react to form a solution. Nitric acid is added to solution A as long as it can completely dissolve bismuth oxide. Among them, Bi:Si (molar ratio)=1:5, the sum of Si ions and Bi ions : Citric acid (molar ratio) = 1:2. Sol B is obtained by adjusting the pH value to 1-3 with ammonia water (volume concentration 25-28%).

[0027] (3) Put sol B in a water bath at 85°C for 2-4 hours until gelatinized, then dry at 1...

Embodiment 3

[0030] A porous metastable Bi 2 SiO 5 The preparation method of block material, comprises the steps:

[0031] (1) Measure 50mL of absolute ethanol, weigh a certain amount of dispersant (composed of ethylenediaminetetraacetic acid, citric acid, diethylenetriaminepentacarboxylic acid, tartaric acid, ethylene glycol, polyethylene glycol.) Add Among them, stir to dissolve, add tetraethyl orthosilicate to form solution A, and control the concentration of each component of the dispersant at 0.01, 0.1, 0.1, 0.5, 0.5, 0.6 mol / L.

[0032] (2) Dissolve bismuth oxide in nitric acid and react to form a solution. Nitric acid is added to solution A as long as it can completely dissolve bismuth oxide. Among them, Bi:Si (molar ratio)=1:4, the sum of Si ions and Bi ions : citric acid (molar ratio)=1:1.5, use ammonia water (volume concentration 25-28%) to adjust the pH value to 1-3 to obtain sol B.

[0033] (3) Put sol B in a water bath at 80°C for 2-4 hours until gelatinized, then dry at 15...

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Abstract

The invention discloses a preparing method for a porous metastable stable Bi2SiO5 block. Absolute ethyl alcohol and deionized water serve as solvents, ethylenediaminetetraacetic acid, citric acid, diethylenetriamine pentabasic acid, tartaric acid, ethylene glycol, polyethylene glycol and the like serve as dispersing agents, gelatinization is carried out at a certain temperature, and dried gel powder is obtained after drying; then, the dried gel powder is directly subjected to dry pressing forming, a block material is formed and subjected to heat treatment, and the porous metastable stable Bi2SiO5 block can be obtained. The method is simple in process, short in period, simple in equipment and low in cost, and the obtained porous material is high in controllability over the pore size and distribution.

Description

technical field [0001] The invention belongs to the field of material technology, in particular to a porous metastable Bi 2 SiO 5 Method of preparation of blocks. Background technique [0002] Currently, in Bi 2 o 3 -SiO 2 The crystal phases of compounds discovered and studied in the system mainly include three types: Bi 2 SiO 5 Crystal, Bi 4 Si 3 o 12 Crystal and Bi 12 SiO 20 crystals, the former of which is a metastable compound, and currently Bi 2 SiO 5 Powder methods mainly include solid phase method, melting method, chemical solution decomposition method and hydrothermal method. The porous bulk material not only maintains a high specific surface area by using the fine pores, but also solves the problem of powder material agglomeration by taking advantage of the advantages of the bulk material. To prepare porous bulk materials, the traditional method is to combine the above methods to obtain Bi 2 SiO 5 Powder, and then add various substances (such as foam...

Claims

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Application Information

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IPC IPC(8): C04B35/16C04B35/624C04B38/06C04B38/02
CPCC04B35/16C04B35/624C04B38/067C04B2235/3298C04B2235/785C04B38/0645C04B38/02C04B38/0054
Inventor 伍媛婷栗梦龙鲁建王秀峰高辉
Owner SHAANXI UNIV OF SCI & TECH
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