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Method for improving inorganic/organic composite membrane performance through interface modification

An inorganic composite membrane, modified technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., to achieve the effect of wide application, low cost, and improved bonding strength

Inactive Publication Date: 2015-07-15
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of the bonding strength of the interface between the separation layer and the support layer, and propose a method for interface modification to improve the performance of organic-inorganic composite membranes

Method used

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  • Method for improving inorganic/organic composite membrane performance through interface modification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Mix octyltriethoxysilane and toluene at a mass ratio of 1:8 to prepare a silane modification solution.

[0020] (2) The tubular ZrO with an average pore diameter of 200nm 2 / Al 2 O 3 Place it in the modification solution and treat it at 60°C for 2h. Remove the support from the modification solution, put it in an oven, and treat it at 110°C for 4h.

[0021] (3) Take 4 g of polydimethylsiloxane and 60 g of n-hexane, stir evenly and stand still to obtain the PDMS coating liquid.

[0022] (4) When the viscosity of the coating liquid is 100mPa·s, apply the coating liquid on the outside of the tubular ceramic support by dipping and pulling. The coating time is 40s. After coating, the film is processed in an oven. It is 80℃, and the time is 1 day. The electron microscope picture of the cross section of the composite membrane is as follows figure 1 Shown.

Embodiment 2

[0028] (1) Mix dodecyltriethoxysilane and xylene at a mass ratio of 1:30 to prepare a silane modification solution.

[0029] (2) The flake TiO with an average pore diameter of 50nm 2 Place it in the modification solution and treat it at 70°C for 2h. Remove the support from the modification solution, put it in an oven, and treat it at 120°C for 3h.

[0030] (3) Take 5g of polyoctyltrimethylsiloxane (POMS) and 70g of n-octane, stir evenly and stand still to obtain the POMS coating liquid.

[0031] (4) When the viscosity of the coating liquid is 50mPa·s, use the dipping and pulling method to 2 The outside of the support is coated with a coating liquid, and the coating time is 60s. After coating, the film is processed in an oven at 100°C for 2 days.

Embodiment 3

[0037] (1) Mix hexadecyltrimethoxysiloxane and absolute ethanol at a mass ratio of 1:40 to prepare a silane modification liquid.

[0038] (2) The hollow fiber Al with an average pore diameter of 300nm 2 O 3 Place it in the modification solution and treat it at 60°C for 4 hours. Remove the support from the modification solution, put it in an oven, and treat it at 100°C for 4 hours.

[0039] (3) Take 3 g of chitosan (CS) and 50 g of n-heptane, stir evenly and stand still to obtain the CS coating liquid.

[0040] (4) When the viscosity of the coating liquid is 20mPa·s, the hollow fiber Al 2 O 3 The outer side of the support is coated with a coating liquid, and the coating time is 30s. After coating, the film is processed in an oven for 120°C for 3 days.

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Abstract

The invention relates to a method for improving the inorganic / organic composite membrane performance through interface modification. In the provided method, a porous ceramic support body is soaked in a silane modifying solution, and then a polymer film-forming solution is painted on the side, which has been modified, of the inorganic ceramic support body so as to obtain the inorganic / organic composite membrane with a modified interface. The provided method can improve the selectivity of the pervaporation composite membrane, at the same time, the binding strength between the inorganic material and the organic material is enhanced at the same time, and thus the stability of the composite membrane is improved. The provided method is simple and economic, and the application range is wide.

Description

Technical field [0001] The invention relates to a method for improving the performance of an organic-inorganic composite membrane by interface modification, and more specifically, it regulates the interface bonding strength of an organic layer and an inorganic support through graft modification of a support. Background technique [0002] Pervaporation is a new type of liquid mixture separation technology. This technology has the characteristics of green energy saving, simple operation and high economic benefits. It is easy to couple with other industrial technologies and is widely used in gas separation, material separation and water treatment. In the research of pervaporation separation method, it is very important to improve the selectivity and flux of the membrane, and the bonding strength between the separation layer and the support layer determines the long-term stability of the composite membrane in practical application in the mixture. Therefore, in order to improve the pe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D69/12B01D67/00
Inventor 金万勤刘公平杭颖婷
Owner NANJING UNIV OF TECH
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