Method for preparing small aperture ceramic film

A ceramic membrane and small pore technology, which is applied in the field of preparation of small pore ceramic membranes, can solve problems such as large resistance, membrane layer defects, and inability to obtain ceramic membranes, so as to increase membrane flux, reduce membrane resistance, and shorten membrane preparation. cycle effect

Active Publication Date: 2008-09-17
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main reason for limiting the popularization and application of ceramic ultrafiltration membranes with small pore sizes is that it is easy to penetrate into the large pores on the surface of the support when using a membrane-forming solution with a smaller sol particle size to coat the membrane, so one or even multiple intermediate transition layers are required, which leads to The membrane has a large resistance during use; at the same time, the rough and macroporous structure of the support surface can cause defects in the membrane layer prepared by sol-gel, and a complete ceramic membrane cannot be obtained

Method used

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  • Method for preparing small aperture ceramic film
  • Method for preparing small aperture ceramic film
  • Method for preparing small aperture ceramic film

Examples

Experimental program
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Embodiment 1

[0024] Titanium content is 1.5mol L -1 , the sol particle diameter is to add MC solution (the mass volume concentration of MC is 50g L -1 ) to prepare a membrane-forming solution, wherein the mass ratio of titanium sol to MC solution is 100:1. Adopt the mode of suction filtration to utilize PVA solution (the mass volume fraction of PVA is 10g L -1 ) to treat the support body (the surface structure pore size is 180nmAl 2 o 3 Ceramic membrane) after coating. After placing the support body containing the surface coating for 7 minutes, place it under constant temperature and humidity conditions with a temperature of 40°C and a humidity of 80% for 0.1 hour, then take it out, the film layer is gelled, and then dry the wet film, and Drying at 60°C and calcining at 400°C can obtain a titanium oxide ceramic film with a pore size of 8nm.

Embodiment 2

[0026] The content of titanium and aluminum is 1mol L -1 , the sol particle diameter is to add PVA solution (the mass volume concentration of PVA is 100g L in the sol of 8nm -1 ) and dimethylformamide to prepare a membrane solution, wherein the mass ratio of the sol to the PVA solution and the dimethylformamide organic additive is 100:10. Adopt the mode of soaking to utilize MC solution (the mass volume fraction of MC is 150g L -1 ) to coat the surface of the support body (the surface structure pore diameter is 100nm carbon film). After placing the support body containing the surface coating for 20 minutes, place it under constant temperature and humidity conditions with a temperature of 60°C and a humidity of 90% for 10 hours and then take it out. Drying at 40°C and calcining at 600°C can obtain a ceramic composite membrane with a pore size of 18nm.

Embodiment 3

[0028] Silicon content is 0.1mol L -1 , Add PEG solution (the mass volume concentration of PEG is 200g L -1 ) to prepare a membrane-forming solution, wherein the mass ratio of silica sol to PEG solution is 100:0.5. The support body (the pore size is 50nm Al 2 o 3 Ceramic membrane) after coating the surface. After the support body containing the surface coating is placed for 10 minutes, it is placed under constant temperature and humidity conditions of 20°C and 100% humidity for 24 hours, and then the film layer is gelled, and then the wet film is dried and placed in the Drying at 30°C and calcining at 250°C can obtain a ceramic ultrafiltration membrane with a pore size of 1nm.

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Abstract

The invention relates to a method for producing a small-aperture ceramic membrane. The invention can produce a small-aperture ceramic ultrafiltration membrane on the surface of a support with an aperture of 50- 200 nm. The method comprises the following steps: treating the surface of the support with larger pore size with organic solution, covering the surface with coating solution with smaller sole particle size, allowing rapid gelatination of the coating under constant-temperature and constant-humidity conditions, preventing leakage of the sol, sun-drying or oven-drying the coating, and removing organic substances by means of solvent extraction or direct calcination, to obtain the small-aperture ceramic membrane. The produced small-aperture ceramic membrane doesn't be affected by the support. The production cycle of the membrane is short with low cost.

Description

technical field [0001] The invention relates to a preparation method of a small-aperture ceramic membrane, in particular to a preparation method of a complete and defect-free small-aperture ceramic membrane without a transition layer. Background technique [0002] Compared with organic membranes, inorganic ceramic membranes have better characteristics such as high temperature resistance, corrosion resistance, microbial erosion resistance, online cleaning, and good regeneration recovery. In the past ten years, their status in membrane separation technology has been increasing. [0003] The ceramic membrane is mainly composed of three layers: a porous carrier, a transition layer, and an active separation layer. The porous carrier can increase the mechanical strength of the membrane, and it is required to have a larger pore size and porosity to increase permeability and reduce liquid transport resistance. The transition layer (intermediate layer) is a structure between the por...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/00C04B35/622
Inventor 景文珩吴守红邢卫红徐南平
Owner NANJING UNIV OF TECH
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