A preparation method of alumina porous ceramic membrane with adjustable pore shape

Abstract

The preparation method of the alumina porous ceramic membrane with adjustable pore shape disclosed by the present invention includes: uniformly dispersing carbon substances in absolute ethanol to obtain a carbon suspension; dissolving aluminum nitrate and ammonium bicarbonate respectively to form a solution, and Under magnetic stirring, add the ammonium bicarbonate solution dropwise to the aluminum nitrate solution, and mix well; then add the carbon suspension dropwise to the above mixed solution, and disperse it evenly through ultrasonic vibration; adjust the pH value to acidic, and then add PAA solution, stirring and mixing to make it into a sol, and obtain a xerogel; after granulation, molding, insulation to remove organic matter, and then isostatic pressing, then put it in a high-temperature furnace and sinter in multiple temperature sections to obtain alumina porous ceramics membrane. When carbon black is used as the carbon material, the pore diameter of the ceramic membrane can reach 10-30nm. The porous ceramic membrane prepared by the invention has the characteristics of uniform pore distribution, controllable pore shape, small pore diameter, high bending strength, etc., and has important application prospects in the fields of sewage filtration, air purification and the like.

Description

technical field

[0001] The invention relates to a method for preparing porous materials, in particular to a method for preparing porous alumina ceramic membranes with adjustable pore shapes, and belongs to the technical field of material science. Background technique

[0002] Porous ceramics is a new type of material that has received widespread attention in recent years. Because of its unique pore structure that can realize a variety of functional properties, it is also called porous functional materials. Porous ceramics not only have excellent stability and high temperature corrosion resistance, but also have the advantages of large specific surface area, high porosity, high permeability, low electrical conductivity, etc., and can be used as filter materials, catalyst carriers, insulation insulation, etc. Thermal materials, biological functional materials, etc., have been widely used in chemical industry, energy, metallurgy, biomedicine, environmental protection, aerospace...

Examples

Embodiment 1

[0018] Dissolve 7 parts by mass of carbon black in absolute ethanol and disperse by ultrasonic to obtain a uniform suspension of carbon black; aluminum nitrate and ammonium bicarbonate in a molar ratio of 1:4; aluminum nitrate in deionized dissolved in water, and ammonium bicarbonate was dissolved in deionized water at the same time; and under the condition of magnetic stirring, the ammonium bicarbonate solution was added dropwise to the aluminum nitrate solution, and the magnetic stirring was used to make it evenly mixed; subsequently, the carbon black suspension was dropped Add it to the mixed solution of aluminum nitrate and ammonium bicarbonate, and disperse it evenly through ultrasonic vibration; adjust the pH value of the solution to acidity, then add the PAA solution with a concentration of 20g / L, stir and mix to make it into a sol; After melting and drying, the xerogel is obtained; add a small amount of binder to the xerogel for granulation, and after it is completely a...

Embodiment 2

[0020] Dissolve 15 parts by mass of activated carbon in absolute ethanol and disperse by ultrasonic to obtain a uniform suspension of activated carbon; aluminum nitrate and ammonium bicarbonate in a molar ratio of 1:4; dissolve aluminum nitrate in deionized water At the same time, ammonium bicarbonate was dissolved in deionized water; and under the condition of magnetic stirring, the ammonium bicarbonate solution was added dropwise to the aluminum nitrate solution, and the magnetic stirring was used to make it evenly mixed; subsequently, the activated carbon suspension was added dropwise to the nitric acid In the mixed solution of aluminum and ammonium bicarbonate, disperse evenly through ultrasonic vibration; adjust the pH value of the solution to acidity, then add PAA solution with a concentration of 25g / L, stir and mix to make a sol; Finally, the xerogel is obtained; add a small amount of binder to the xerogel for granulation, and after it is completely uniformly dispersed, ...

Embodiment 3

[0022] Dissolve 20 parts by mass of carbon nanofibers in absolute ethanol and disperse by ultrasonic to obtain a uniform suspension of carbon nanofibers; aluminum nitrate and ammonium bicarbonate in a molar ratio of 1:4; aluminum nitrate in Dissolve in deionized water, and dissolve ammonium bicarbonate in deionized water at the same time; and under the condition of magnetic stirring, add the ammonium bicarbonate solution dropwise to the aluminum nitrate solution, and magnetically stir to make it evenly mixed; subsequently, the carbon nanofiber Add the suspension dropwise to the mixed solution of aluminum nitrate and ammonium bicarbonate, and disperse it evenly through ultrasonic vibration; adjust the pH value of the solution to acidity, then add PAA solution with a concentration of 30g / L, stir and mix to make a sol ;Obtain the xerogel after forming and drying; add a small amount of binder to the xerogel for granulation, after it is completely and uniformly dispersed, first shap...

technical field

[0001] The invention relates to a method for preparing porous materials, in particular to a method for preparing porous alumina ceramic membranes with adjustable pore shapes, and belongs to the technical field of material science. Background technique

[0002] Porous ceramics is a new type of material that has received widespread attention in recent years. Because of its unique pore structure that can realize a variety of functional properties, it is also called porous functional materials. Porous ceramics not only have excellent stability and high temperature corrosion resistance, but also have the advantages of large specific surface area, high porosity, high permeability, low electrical conductivity, etc., and can be used as filter materials, catalyst carriers, insulation insulation, etc. Thermal materials, biological functional materials, etc., have been widely used in chemical industry, energy, metallurgy, biomedicine, environmental protection, aerospace...

Examples

Embodiment 1

[0018] Dissolve 7 parts by mass of carbon black in absolute ethanol and disperse by ultrasonic to obtain a uniform suspension of carbon black; aluminum nitrate and ammonium bicarbonate in a molar ratio of 1:4; aluminum nitrate in deionized dissolved in water, and ammonium bicarbonate was dissolved in deionized water at the same time; and under the condition of magnetic stirring, the ammonium bicarbonate solution was added dropwise to the aluminum nitrate solution, and the magnetic stirring was used to make it evenly mixed; subsequently, the carbon black suspension was dropped Add it to the mixed solution of aluminum nitrate and ammonium bicarbonate, and disperse it evenly through ultrasonic vibration; adjust the pH value of the solution to acidity, then add the PAA solution with a concentration of 20g / L, stir and mix to make it into a sol; After melting and drying, the xerogel is obtained; add a small amount of binder to the xerogel for granulation, and after it is completely a...

Embodiment 2

[0020] Dissolve 15 parts by mass of activated carbon in absolute ethanol and disperse by ultrasonic to obtain a uniform suspension of activated carbon; aluminum nitrate and ammonium bicarbonate in a molar ratio of 1:4; dissolve aluminum nitrate in deionized water At the same time, ammonium bicarbonate was dissolved in deionized water; and under the condition of magnetic stirring, the ammonium bicarbonate solution was added dropwise to the aluminum nitrate solution, and the magnetic stirring was used to make it evenly mixed; subsequently, the activated carbon suspension was added dropwise to the nitric acid In the mixed solution of aluminum and ammonium bicarbonate, disperse evenly through ultrasonic vibration; adjust the pH value of the solution to acidity, then add PAA solution with a concentration of 25g / L, stir and mix to make a sol; Finally, the xerogel is obtained; add a small amount of binder to the xerogel for granulation, and after it is completely uniformly dispersed, ...

Embodiment 3

[0022] Dissolve 20 parts by mass of carbon nanofibers in absolute ethanol and disperse by ultrasonic to obtain a uniform suspension of carbon nanofibers; aluminum nitrate and ammonium bicarbonate in a molar ratio of 1:4; aluminum nitrate in Dissolve in deionized water, and dissolve ammonium bicarbonate in deionized water at the same time; and under the condition of magnetic stirring, add the ammonium bicarbonate solution dropwise to the aluminum nitrate solution, and magnetically stir to make it evenly mixed; subsequently, the carbon nanofiber Add the suspension dropwise to the mixed solution of aluminum nitrate and ammonium bicarbonate, and disperse it evenly through ultrasonic vibration; adjust the pH value of the solution to acidity, then add PAA solution with a concentration of 30g / L, stir and mix to make a sol ;Obtain the xerogel after forming and drying; add a small amount of binder to the xerogel for granulation, after it is completely and uniformly dispersed, first shap...