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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 is serious with the increase of the number and thickness of the transition layer; Although the membrane has a large flux, its strength is low, and it is difficult to further reduce the pore size

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

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Embodiment 1

[0027] The preparation of embodiment 1 double-layer titanium oxide ultrafiltration membrane

[0028] 5 g of titanium oxide fibers (200 nm in diameter, 50:1 aspect ratio) were added into 80 g of titanium oxide sol and mixed thoroughly. The solid content of the sol was 0.8% (wt%) and the particle size was 25 nm. Nitric acid was added dropwise to adjust the pH of the solution to 3, followed by adding 0.4 g of polyethyleneimine (PEI), 0.4 g of hydroxypropyl cellulose (HPC), 0.1 g of silicone defoamer, and 30 g of deionized water to prepare a mixed solution. 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 size of 3 μm, and the temperature is raised to 80 °C at 2 °C / min and dried in a hot air drying oven for 10 hours to form a transition layer. The titanium oxide sol film-making liquid of solid content 0.75% (wt%) is repeatedly coated on the surface of the transition ...

Embodiment 2

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

[0030] Add 5g of potassium titanate whiskers (diameter: 400nm, aspect ratio: 40:1) into 50g titanium oxide sol and mix well. The sol has a solid content of 0.8% (wt%) and a particle size of 25nm. Nitric acid was added dropwise to adjust the pH of the solution to 4, followed by adding 0.3 g of polyvinylamine (PEI), 0.4 g of polyvinyl alcohol (PVA), 0.1 g of silicone defoamer, and 30 g of deionized water to form a mixed solution, which was passed through high-speed Stir and ultrasonically disperse to prepare a coating solution, coat the tubular titanium oxide porous carrier with an average pore size of 3 μm, raise the temperature at 2 °C / min to 80 °C, and dry in a hot air drying oven for 10 hours to form a transition layer. The titanium oxide sol film-making solution of 0.8% (wt%) of solid content is repeatedly coated on the surface of the transition layer 2 times, and afte...

Embodiment 3

[0031] The preparation of embodiment 3 double-layer silicon oxide / alumina ultrafiltration membranes

[0032] 5g of alumina nanowires (diameter: 10nm, aspect ratio: 50:1) were added into 50g of silica sol and mixed thoroughly. The solid content of the sol was 0.8% (wt%) and the particle size was 25nm. Add dropwise nitric acid to adjust the pH of the solution to 3, add polyethylene glycol (PEG) 0.2g, methyl cellulose (MC) 0.2g, organic silicon defoamer 0.1g, deionized water 30g, and prepare a mixed solution. The coating solution was prepared by high-speed stirring and ultrasonic dispersion, and the film was coated on a flat porous titanium support with an average pore size of 2 μm. 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 silica sol film-making solution with a solid content of 0.75% (wt%), dry it in a constant temperature and humidity box at 75°C for...

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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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