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Asymmetric porous ceramic micro filter film and its preparing method

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

Inactive Publication Date: 2007-01-24
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

[0022] Example 1: Asymmetric Porous γ-Al 2 o 3 Ceramic Microfiltration Membrane Preparation

[0023] 2 grams of γ-Al with an average diameter of 20nm and a length of 800-1000nm 2 o 3 The fibers were dispersed in deionized water (the mass ratio of the two was 2.0:100), at 85°C, an appropriate amount of HNO was added 3 Dispersant (H + / Al 3+ = 0.04:1), stirred for about 4 hours to make a suspension of nano metal oxide fibers, added binder methyl cellulose and plasticizer polyvinyl alcohol to make a coating solution, nano γ-Al 2 o 3The fiber content is 1.4% (wt%), the total amount of additives is 0.4% (wt%), and the mass ratio of methylcellulose and polyvinyl alcohol in the additives is 1:4. Immediately immerse the prepared coating solution on the surface of the ceramic matrix transition layer (average pore size 0.8 μm), and after drying at room temperature for 15 hours, raise the temperature to 350°C at a rate of 0.5°C / min, keep the temperature for 3 hours, and continue a...

Embodiment 2

[0026] Example 2: Asymmetric Porous Ceramic Al 2 o 3 -TiO 2 Composite microfiltration membrane preparation

[0027] 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), at 85 °C, add an appropriate amount of HNO 3 Dispersant (H + / Ti 4+ =0.05:1), electromagnetic stirring for about 4 hours to make nano-TiO 2 Fiber suspension, add binder methyl cellulose and plasticizer polyvinyl alcohol to make coating liquid, nano TiO 2 The fiber content is 1.1% (wt%), and the total amount of additives is 0.4% (wt%). The mass ratio of methyl cellulose and polyvinyl alcohol in the additive is 1:4. Immediately immerse the prepared coating solution on the surface of the transition layer (average pore size 0.8μm) of the ceramic matrix, and after drying at room temperature for 20 hours, raise the temperature to 350°C at a rate of 0.1°C / min, keep the temperature for 2 hours, and continue...

Embodiment 3

[0028] Example 3: Asymmetric Porous Ceramic Al 2 o 3 -CeO 2 Composite microfiltration membrane preparation

[0029] 2.5 grams of nano-CeO with an average diameter of 20nm and a length of 850-1000nm 2 Fiber, dispersed in deionized water (the mass ratio of the two is 2.5:100), at 60-90°C, add an appropriate amount of HNO 3 Dispersant (H + / C 4+ =0.05:1), electromagnetic stirring for about 4 hours to make nano-CeO 2 Fiber suspension, add binder methyl cellulose and plasticizer polyvinyl alcohol to make coating liquid, nano CeO 2 The fiber content is 2.0% (wt%), and the total amount of additives is 0.6% (wt%). The mass ratio of methyl cellulose and polyvinyl alcohol in the additive is 1:4. Immediately immerse the prepared coating solution on the surface of the transition layer (average pore size 0.8μm) of the ceramic matrix, and after drying at room temperature for 20 hours, raise the temperature to 350°C at a rate of 0.1°C / min, keep the temperature for 2 hours, and contin...

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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 nanometer metal oxide fiber as a membrane material for a transition layer and a separation layer, and nanometer or micron metal oxide particles are used as a transition layer Compared with the corresponding ceramic microfiltration membrane prepared from the membrane material of the separation layer, it has 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 anti-microbial ability, and long service life. Hotspots of technology research and application development. Asymmetric porous ceramic filter membrane is an inorganic membrane with wide application and more research and development. Its structure i...

Claims

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Application Information

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