Method for preparing ceramic nanofiltration membrane support body with gradient pores

A ceramic nanofiltration membrane and support technology are applied in the field of preparing ceramic nanofiltration membrane supports, which can solve the problems of ceramic nanofiltration membrane preparation and industrialization difficulty, and achieve the effects of less defects, low roughness, and reduced preparation conditions.

Active Publication Date: 2012-02-15
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These have brought great difficulties to the preparation and industrialization of ceramic nanofiltration membranes;

Method used

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  • Method for preparing ceramic nanofiltration membrane support body with gradient pores
  • Method for preparing ceramic nanofiltration membrane support body with gradient pores
  • Method for preparing ceramic nanofiltration membrane support body with gradient pores

Examples

Experimental program
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Effect test

Embodiment 1

[0024] In this example, α-Al 2 o 3 Powder (the particle size distribution range is 100nm~14.2 μm, and the average particle size is 0.55 μm) 50 grams plus 50 grams of deionized water is mixed with a suspension with a mass concentration of 50%, adding nitric acid as a dispersant, adjusting the pH to 2.0, Add 1.0 g of polyvinyl alcohol with a molecular weight of 22,000 as a binder; add 2.0 g of zirconia as a sintering aid; ultrasonicate for 10 minutes, add the suspension to the mold, let it stand for 10 hours, and pump it under a pressure of 0.2 bar. Dry at 40°C for 2 hours; remove the mold to obtain a green body, then raise the temperature of the green body to 950°C at a heating rate of 2.0°C / min for 3 hours, and cool naturally to obtain a ceramic membrane support with gradient pores; the surface layer of the support Surface scanning (SEM) photographs of figure 1 shown.

Embodiment 2

[0026] In this example, α-Al 2 o 3 Powder (the particle size distribution range is 100nm ~ 4.0μm, the average particle size is 0.8μm) 40 grams plus 60 grams of deionized water to prepare a suspension with a mass concentration of 40%, adding 0.2 grams of polyammonium methacrylate as a dispersant , adding 2.3 grams of polyvinyl alcohol with a molecular weight of 55,000 as a binder; adding 1.6 grams of zirconia as a sintering aid; ultrasonication for 10 minutes, adding the suspension to the mold, standing for 15 hours, and pumping under a pressure of 0.2bar , dried at 40°C for 2 hours; demolded to obtain a green body, the green body was heated at a heating rate of 1.5°C / min to 1150°C for 1 hour, and cooled naturally to obtain a ceramic membrane support with gradient pores.

Embodiment 3

[0028] Add 40 grams of zirconia powder (the particle size distribution range is 100 nm to 4.78 μm, and the average particle size is 0.27 μm) and add 460 grams of deionized water to prepare a suspension with a mass concentration of 8%, and add 0.2 grams of polyammonium methacrylate As a dispersant, add 2.3 grams of polyvinyl alcohol with a molecular weight of 55,000 as a binder; add 1.6 grams of zirconia and 10 grams of alumina as a sintering aid; ultrasonic for 10 minutes, add the suspension to the mold, and let it stand for 15 hours. Suction at a pressure of 0.1bar, dry at 70°C for 1 hour; demould to obtain a green body, heat the green body at a rate of 1.5°C / min to 1150°C for 1 hour, and cool naturally to obtain a ceramic with gradient pores membrane support.

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Abstract

The invention relates to a preparation method of a ceramic nanofiltration membrane support body with a gradient pore structure. It is characterized in that: the ceramic powder with particle size distribution range of 50nm-20μm and average particle size of 0.1-10μm is added with water, dispersant, and binder to prepare a well-dispersed suspension, after standing (gravity sedimentation), Vacuum suction, drying, sintering and molding. The present invention deposits particles of different particle sizes in order from large to small through gravity settling and vacuum suction, thereby obtaining high throughput, high surface performance (smooth, complete and defect-free surface), and an average surface pore diameter of 50nm ~300nm and a ceramic nanofiltration membrane support with a gradient pore structure of a certain strength.

Description

technical field [0001] The invention relates to a method for preparing a ceramic nanofiltration membrane support body, in particular to a method for preparing a ceramic nanofiltration membrane support body with gradient pores. Background technique [0002] As a new type of separation technology, ceramic membrane has been widely used in chemical industry, medicine, food wastewater treatment and other industries. Compared with the partially industrialized organic nanofiltration membranes with corresponding pore structures, the preparation of ceramic nanofiltration membranes is very difficult. As a secret, the industrial preparation technology is mastered by a few large foreign companies. The research on ceramic nanofiltration membranes in the literature mostly uses the above-mentioned commercial supports, and the ceramic nanofiltration membranes are directly prepared on them. At present, only German Inopor company in the world has realized it. Industrial production of ceramic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/10
Inventor 漆虹江晓骆刑卫红范益群徐南平
Owner NANJING TECH UNIV
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