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
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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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