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Asymmetric porous ceramic micro filter film and its preparing method

A porous ceramic and microfiltration membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of low permeability and thick membrane thickness, and achieve the effect of high permeability

Inactive Publication Date: 2008-06-11
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the thickness of this asymmetric porous ceramic filter membrane is relatively thick, generally greater than 2 mm. Compared with the thinner organic polymer membrane, the permeability of the former is obviously lower under the same pore size of the separation layer, separation objects and operating conditions. Low

Method used

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  • Asymmetric porous ceramic micro filter film and its preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: Asymmetric porous γ-Al 2 O 3 Ceramic microfiltration membrane preparation

[0022] 2 grams of nanometer γ-Al with an average diameter of 20nm and a length of 800-1000nm 2 O 3 The fiber is dispersed in deionized water (the mass ratio of the two is 2.0: 100), and an appropriate amount of HNO is added at 85°C 3 Dispersant (H + / Al 3+ =0.04:1), stir for about 4 hours to prepare nano metal oxide fiber suspension, add binder methyl cellulose and plasticizer polyvinyl alcohol to prepare coating liquid, nano γ-Al 2 O3 The fiber content is 1.4% (wt%), the total amount of plasticizer and binder is 0.4% (wt%), and the mass ratio of plasticizer and binder is 1:4. The coating solution was immediately immersed on the surface of the ceramic substrate transition layer (average pore diameter 0.8μm), and after being allowed to dry at room temperature for 15 hours, the temperature was raised to 350°C at a rate of 0.5°C / min, kept at a constant temperature for 3 hours, and continued ...

Embodiment 2

[0025] Example 2: Asymmetric porous ceramic Al 2 O 3 -TiO 2 Preparation of composite microfiltration membrane

[0026] 1.5 grams of nano TiO with an average diameter of 20nm and a length of 800-900nm 2 Fiber, dispersed in deionized water (the mass ratio of the two is 1.5: 100), add appropriate amount of HNO at 85℃ 3 Dispersant (H + / Ti 4+ =0.05:1), electromagnetic stirring for about 4 hours to produce nanometer TiO 2 Fiber suspension, add binder methyl cellulose and plasticizer polyvinyl alcohol to make a coating liquid, nano TiO 2 The fiber content is 1.1% (wt%), and the total amount of plasticizer and binder is 0.4% (wt%). The mass ratio of plasticizer and binder is 1:4. Immediately immerse the finished coating liquid on the surface of the ceramic substrate transition layer (average pore diameter 0.8μm), and after it is allowed to dry at room temperature for 20 hours, the temperature is increased to 350°C at a rate of 0.1°C / min, the temperature is kept constant for 2 hours, and ...

Embodiment 3

[0027] Example 3: Asymmetric porous ceramic Al 2 O 3 -CeO 2 Preparation of composite microfiltration membrane

[0028] 2.5 grams of nano CeO with an average diameter of 20nm and a length of 850-1000nm 2 Fiber, dispersed in ion-free water (the mass ratio between the two is 2.5: 100), add appropriate amount of HNO at 60-90℃ 3 Dispersant (H + / Ce 4+ =0.05:1), electromagnetic stirring for about 4 hours to prepare nano-CeO 2 Fiber suspension, add binder methyl cellulose and plasticizer polyvinyl alcohol to prepare coating liquid, nano CeO 2 The fiber content is 2.0% (wt%), and the total amount of plasticizer and binder is 0.6% (wt%). The mass ratio of plasticizer and binder is 1:4. Immediately immerse the finished coating liquid on the surface of the ceramic substrate transition layer (average pore diameter 0.8μm), and dry it at room temperature for 20 hours, then increase the temperature to 350°C at a rate of 0.1°C / min, keep the temperature constant for 2 hours, and continue at 0.1°C ...

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Abstract

The present invention relates to asymmetric porous ceramic ultra-filtering membrane and its preparation process. The asymmetric porous ceramic ultra-filtering membrane in high permeability is prepared with nanometer metal oxide fiber to replace conventionally used metal oxide grain as the transition layer and separation layer film material, and porous alpha-alumina ceramic substrate. Compared with available ceramic ultra-filtering membrane prepared with micron metal oxide grain, the asymmetric porous ceramic ultra-filtering membrane prepared with nanometer metal oxide fiber has a two times higher pure water permeability.

Description

Technical field [0001] The invention relates to an asymmetric porous ceramic microfiltration membrane and a preparation method thereof. The asymmetric porous ceramic microfiltration membrane is prepared by using nano metal oxide fibers as the membrane material of the transition layer and the separation layer, and the nano or micro metal oxide particles are used as the transition layer Compared with the corresponding ceramic microfiltration membrane prepared by the membrane material of the separation layer, it has a high permeability. Background technique [0002] Compared with organic polymer membranes, inorganic membranes have the advantages of high temperature resistance, good chemical stability, high mechanical strength, strong antimicrobial ability, and long service life. Therefore, inorganic membrane technology has developed rapidly in the past ten years and has become an international membrane. Hot spots of technology research and application development. Asymmetric porous ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/02B01D67/00
Inventor 高学平朱怀勇曲金秋叶世海张淑芬鲁淑群尹杰宋德瑛
Owner NANKAI UNIV
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