Asymmetrically-structural ceramic ultrafiltration membrane and preparation method thereof

A technology of ceramic ultrafiltration membrane and asymmetric structure, which is applied in the field of ceramic ultrafiltration membrane of asymmetric structure and its preparation, can solve the problems of flux loss, reduced pore size, long period, etc., achieves high selectivity and reduces internal seepage , the effect of complete structure

Active Publication Date: 2010-08-04
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: the ultrafiltration membrane prepared by the existing sol-gel method has long cycle time, high cost, and the loss of flux i

Method used

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  • Asymmetrically-structural ceramic ultrafiltration membrane and preparation method thereof
  • Asymmetrically-structural ceramic ultrafiltration membrane and preparation method thereof
  • Asymmetrically-structural ceramic ultrafiltration membrane and preparation method thereof

Examples

Experimental program
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Example Embodiment

[0027] Example 1 Preparation of double-layer titanium oxide ultrafiltration membrane

[0028] 5g of titanium oxide fiber (diameter 200nm, length-to-diameter ratio of 50:1) was added to 80g of titanium oxide sol and mixed thoroughly. The solid content of the sol was 0.8% (wt%) and the particle size was 25nm. Add nitric acid dropwise to adjust the pH of the solution to 3, add 0.4g polyethyleneimine (PEI), 0.4g hydroxypropyl cellulose (HPC), 0.1g silicone defoamer, and 30g deionized water to prepare a mixed solution in sequence. After high-speed stirring and ultrasonic dispersion, the coating liquid is prepared, and the film is coated on a flat α-alumina porous carrier with an average pore diameter of 3μm. The temperature is raised at 2℃ / min to 80℃ and dried in a hot air drying oven for 10 hours to form a transition. Floor. Coating the surface of the transition layer with a solid content of 0.75% (wt%) titanium oxide sol film-forming solution 3 times, each coating is dried in a con...

Example Embodiment

[0029] Example 2 Preparation of double-layer titanium oxide / potassium titanate ultrafiltration membrane

[0030] 5g potassium titanate whiskers (diameter 400nm, length-to-diameter ratio 40:1) were added to 50g titanium oxide sol and mixed thoroughly. The solid content of the sol was 0.8% (wt%) and the particle size was 25nm. Add nitric acid dropwise to adjust the pH of the solution to 4, add 0.3g of polyethylene industrial amine (PEI), 0.4g of polyvinyl alcohol (PVA), 0.1g of silicone defoamer, and 30g of deionized water to prepare a mixed solution. Stir and ultrasonically disperse to prepare a film coating solution, coat the film on a tubular titanium oxide porous carrier with an average pore diameter of 3 μm, and heat it up at 2° C. / min to 80° C. and dry it in a hot air drying oven for 10 hours to form a transition layer. The surface of the transition layer was repeatedly coated with a solid content of 0.8% (wt%) titanium oxide sol film-forming solution twice. After each coatin...

Example Embodiment

[0031] Example 3 Preparation of double-layer silica / alumina ultrafiltration membrane

[0032] 5g alumina nanowires (diameter 10nm, length-to-diameter ratio 50:1) are added to 50g silica sol and mixed thoroughly. The solid content of the sol is 0.8% (wt%) and the particle size is 25nm. Add nitric acid dropwise to adjust the pH of the solution to 3, add 0.2g polyethylene glycol (PEG), 0.2g methylcellulose (MC), 0.1g silicone defoamer, and 30g deionized water to prepare a mixed solution. High-speed agitation and ultrasonic dispersion were used to prepare a coating liquid. The film was coated on a flat porous titanium support with an average pore diameter of 2μm, and the temperature was raised to 60°C at 2°C / min and dried in a hot air drying oven for 12 hours to form a transition layer. Coat the surface of the transition layer with a solid content of 0.75% (wt%) silica sol film-forming solution, dry it in a constant temperature and humidity box at 75°C for 12 hours, then heat it up t...

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Abstract

The invention relates to an asymmetrically-structural ceramic ultrafiltration membrane and a preparation method thereof, wherein the preparation method thereof comprises the steps: dispersing one-dimensional fibrous material in sol and sufficiently mixing the material with the gel; by adding deionized water, controlling the weight ratio of gel particle to fiber in membrane preparing solution in a range from 0.01 to 0.4, adjusting pH value of the solution, adding dispersing agent, thickening agent and defoaming agent to formulate the membrane preparing solution, coating membrane on a porous support body and drying the porous support body to form a transition layer; coating the gel-containing membrane preparing solution on the surface of the transition layer, air-drying, oven-drying and roasting the wet membrane, and naturally cooling the membrane to result in the asymmetrically-structural ceramic ultrafiltration membrane. Since the transition layer is composed of fiber and sintering is promoted through the gel, resistance of the transition layer is advantageously lessened and interior combination strength of the transition layer is enhanced; the fiber-constructed transition layer divides large pores into small pores to provide larger total porosity and flowing pore channel, thus high permeation flux is maintained while high selectivity is obtained.

Description

technical field [0001] The invention relates to a ceramic ultrafiltration membrane and a preparation method thereof, in particular to an asymmetric ceramic ultrafiltration membrane with a one-dimensional fibrous material as a transition layer and sol particles as a separation layer and a preparation method thereof. Background technique [0002] Ceramic membrane is a functional ceramic material with asymmetric structure. It has the characteristics of acid and alkali resistance, organic solvent resistance and high temperature resistance. It has been widely used in chemical industry, food industry, pharmaceutical industry and environmental protection. Generally speaking, ceramic ultrafiltration membranes for industrial applications are composed of a porous carrier, an intermediate transition layer, and a separation layer. The transition layer is usually prepared by solid particle sintering, and the separation layer is mostly prepared by sol-gel method. Each layer needs to be si...

Claims

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Application Information

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IPC IPC(8): B01D71/02B01D67/00
Inventor 范益群邱鸣慧徐南平
Owner NANJING UNIV OF TECH
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