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A kind of preparation method of high flux antifouling inorganic membrane

An inorganic membrane and high-flux technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of limited improvement in permeation flux and anti-pollution ability, and unsatisfactory dispersion

Active Publication Date: 2016-06-29
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitation of the structure of the active reactant layer, although the generated surface layer also has some nano-microstructures, the dispersion degree is not ideal, and the improvement of the permeation flux and anti-pollution ability of the membrane is limited.

Method used

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preparation example Construction

[0030] According to another embodiment of the present invention, the preparation method of the inorganic membrane with nano-rough surface and pore wall is provided, comprising:

[0031] A) Immerse the inorganic membrane in the modification solution, which is a solution that can generate metal or silicon oxide through hydrolysis-polycondensation reaction, and take out the membrane after a predetermined time of reaction;

[0032] B) cleaning the membrane with a solvent;

[0033] C) drying the washed membrane;

[0034] D) The dried membrane is heat-treated to obtain a high-flux membrane.

[0035] According to one embodiment of the present invention, the above-mentioned modifying liquid is Si(OR) 4 Solution, R is alkyl, solute is SiO 2 Calculation based on the mass ratio of the solution, SiO 2 The concentration is 0.01-5%.

[0036] According to an embodiment of the present invention, the modification step A) above is carried out at a temperature ranging from room temperature ...

Embodiment 1

[0043] Prepare the modified solution according to the volume ratio of tetraethyl orthosilicate: water: ethanol: ammonia = 10:270:40:5. The raw material membrane is an asymmetric fly ash base with an average pore diameter of 0.77 μm, an outer diameter of 10 mm, and an inner diameter of 5.5 mm. Ceramic microfiltration membrane, under the pressure difference across the mold of 01.MPa, the pure water flux of the raw material membrane is 1.33m 3 / m 2 h. Immerse the raw material film in the modification solution, heat the modification solution to 70°C, reflux for 4 hours, take out the film, clean the film with absolute ethanol, dry the cleaned film and put it in a heating furnace at 1°C / Raise the temperature to 500°C at a heating rate of 1 minute, keep the temperature at 500°C for 1 hour, and cool down to room temperature naturally to obtain a ceramic membrane with nano-silica surface and pore walls.

[0044] The flux and antifouling ability of the modified ceramic membrane

[0...

Embodiment 2

[0047]Prepare the modified solution according to the volume ratio of tetraethyl orthosilicate: water: ethanol: ammonia water = 1:20:9:5. The raw material membrane is a homogeneous fly ash membrane with an average pore size of 0.3 microns, and the pure water flux of the membrane is 381.1L / m 2 h. Immerse the raw material film in the modification solution, heat the modification solution to 70°C, reflux for 4 hours, take out the film, clean the film with absolute ethanol at 60°C, dry the cleaned film and put it in a heating furnace. Raise the temperature to 500°C at a heating rate of 1°C / min, keep at 500°C for 1 hour, and cool down to room temperature naturally. Under the pressure difference across the mold of 0.1MPa, the measured pure water flux of the modified membrane is 391.32L / m 2 h, increased by 2.68% compared with before modification.

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Abstract

The invention provides a method capable of greatly improving the infiltration capacity and the anti-pollution capacity of a membrane. The method is characterized in that nano-silica is formed on the surface and pore walls of the membrane. The invention provides a preparation method of a high-pass inorganic membrane, and the preparation method is characterized by comprising the following steps: (A) soaking the inorganic membrane in a modifying solution which is a solution capable of generating silica through hydrolysis- polycondensation reaction, and reacting for preset time; (B) taking out the membrane, and washing the inorganic membrane by using a solvent; (C) drying the washed inorganic membrane; and (D) thermally treating the dried inorganic membrane to obtain the high-pass inorganic membrane. The invention also provides the high-pass inorganic membrane which is prepared by the method according to any one of claims 1-8.

Description

field of invention [0001] The invention relates to the field of inorganic membranes, and provides a method for preparing a high-throughput, anti-pollution inorganic membrane with a nano-silicon dioxide surface and a hole wall. Background technique [0002] Porous membrane materials include polymer membranes and inorganic membranes. Inorganic membranes are more and more widely used due to their good thermal stability, high mechanical strength, and high chemical stability. Although inorganic membranes have good performance, their high cost limits their applications. Improve the flux and anti-fouling ability of the membrane, thereby increasing the production capacity per unit membrane area, and reducing the cost for a certain production capacity requirement. For this reason, asymmetric inorganic membranes have been developed, and the thickness of the separation layer has been reduced as much as possible to increase the porosity in order to increase the flux of the membrane. T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/02B01D69/10B01D67/00
Inventor 秦国彤方晶江雷
Owner BEIHANG UNIV