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Method for preparing porous inorganic membrane by particle sintering technology assisted by carbon skeleton

An inorganic membrane and inorganic membrane-forming technology, applied in the field of membrane science, can solve problems such as cracks in the membrane layer, complex heat treatment process, and harsh requirements on the substrate, so as to achieve low fluid penetration resistance, avoid cracks or even peeling off, and weaken the stress of the membrane layer Effect

Active Publication Date: 2014-06-11
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method for preparing a porous inorganic membrane by a particle sintering process assisted by a carbon skeleton, which can overcome the harsh requirements for the substrate and the defects of the complex heat treatment process in the prior art, and solve the problem that the film layer is prone to cracks in the preparation of the porous inorganic membrane. Even the technical problem of peeling off, the inorganic membrane with excellent performance is directly prepared on the surface of the large-pore substrate

Method used

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  • Method for preparing porous inorganic membrane by particle sintering technology assisted by carbon skeleton
  • Method for preparing porous inorganic membrane by particle sintering technology assisted by carbon skeleton
  • Method for preparing porous inorganic membrane by particle sintering technology assisted by carbon skeleton

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Effect test

Embodiment 1

[0044] Adopt the method of the present invention to prepare porous Al 2 o 3 film, the specific steps are as follows:

[0045] (1)Al 2 o 3 Preparation of coating solution

[0046] Add 16 g of commercial PURAL SB powder into 500 ml of deionized water, mix well to form a suspension, stir and heat to 85 °C and reflux for 2 h, then add 15 ml of nitric acid solution with a concentration of 1.6 mol / L to dissolve the gel, and keep it at 85 Stirring was continued at ℃ for 5 h, then the temperature was naturally lowered, and a stable translucent γ-AlOOH sol was obtained by aging. Finally, the obtained sol was uniformly mixed with a dispersant (aqueous solution of 8 wt.% polyvinyl alcohol (polymerization degree 1750) and 5 wt.% polyethylene glycol-400) at a mass ratio of 6:1 to obtain a γ- 2.6% coating solution of AlOOH particles (particle size 30 nm).

[0047] (2) Coating film

[0048] The substrate used is a porous ceramic substrate with an average pore size of 0.8 μm. Al by di...

Embodiment 2

[0055] Adopt the method of the present invention to prepare porous Al 2 o 3 film, the specific steps are as follows:

[0056] (1) Same as step (1) of Example 1, but the composition of the dispersant in the coating solution used is 3 wt.% polyvinyl alcohol, 2 wt.% methylcellulose, and 4 wt.% polyethyleneimine.

[0057] (2) Same as step (2) of Example 1.

[0058] (3) Anaerobic heat treatment

[0059] The dried substrate was placed in a heating furnace, and the temperature was raised to 600 °C at a rate of 0.5 °C / min, and kept for 3 h, and the heat treatment atmosphere was argon.

[0060] (4) Aerobic heat treatment

[0061] The argon gas was switched to oxygen, at 400 °C, kept for 1 h and then cooled naturally.

[0062] The average pore diameter was measured by mercury intrusion porosimetry to be 0.04 μm.

Embodiment 3

[0064] Adopt method of the present invention to prepare porous silver film, its concrete steps are as follows:

[0065] (1) Preparation of silver coating solution

[0066] 2 g AgNO 3 The solid was dissolved in 50 g of dispersant (aqueous solution of 5 wt.% polyvinyl alcohol and 3 wt.% polyethylene glycol), and 1 ml (85 wt.%) of hydrazine hydrate was added dropwise while stirring. After complete reaction, a solution containing Ag particle (particle size: 150 nm) 2.4% coating solution.

[0067] (2) Coating film

[0068] The substrate used is a porous stainless steel substrate with an average pore size of 2.0 μm. The coating solution was coated on the surface of the substrate by dipping method, and dried for 12 h at a temperature of 30 °C and a humidity of 20%.

[0069] (3) Anaerobic heat treatment

[0070] The dried substrate was placed in a heating furnace, and the temperature was raised to 500 °C at a rate of 1 °C / min, and kept for 1.5 h, and the heat treatment atmosphere...

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Abstract

The invention discloses a method for preparing a porous inorganic membrane by a particle sintering technology assisted by a carbon skeleton. The method is characterized by including the following steps: firstly, preparing membrane coating liquid containing inorganic membrane-forming particles, organic membrane-forming agent and membrane-forming assistant; secondly, uniformly coating the membrane coating liquid on the surface of a porous matrix and drying the membrane coating liquid to form a coating layer; thirdly, conducting anaerobic heat treatment on the coating layer and taking carbon formed after the carbonization of the organic membrane-forming agent and membrane-forming assistant as a skeleton to realize the on-site sintering of the inorganic membrane-forming particles; and at last, conducting aerobic heat treatment and decarburization on the inorganic membrane-forming particles after sintering, thus preparing the porous inorganic membrane. The method can meet the requirement on direct membrane formation on the surface of a matrix with large pore diameter; during the process of particle sintering, membrane layer stress and aggregation sintering can be effectively weakened, the membrane layer is prevented from cracking even stripping and the success rate of membrane preparation is improved greatly; and the prepared porous inorganic membrane has the characteristics of being thin in thickness, small in pore diameter and narrow in distribution, high in porosity, small in osmotic resistance of fluid, and the like.

Description

technical field [0001] The invention belongs to the field of membrane science and technology, and relates to a preparation process of a porous inorganic membrane, in particular to a method for preparing a porous inorganic membrane by a particle sintering process assisted by a carbon skeleton, which is applicable to the preparation of a sol-gel method and a suspended particle sintering method Porous ceramic membrane or porous metal membrane. Background technique [0002] With the rapid development of membrane science and technology, membrane separation, as a new and efficient separation technology, has been widely used in many fields such as energy, petrochemical industry, biochemical industry, health medicine, environment, metallurgy and food. Compared with traditional separation technology, membrane separation technology has the advantages of high efficiency, energy saving, easy operation, environmental friendliness and high integration. [0003] According to different mem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D67/00B01D71/02
Inventor 黄彦魏磊俞健宋军
Owner NANJING TECH UNIV
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