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Ceramic membrane, chemical grafting modification method and application

A technology of chemical grafting and grafting modifier, applied in the field of membrane material modification, can solve the problems of dependence, limited chemical grafting modification methods, narrowing of membrane pore size and porosity, etc.

Active Publication Date: 2021-10-22
NANJING UNIV OF TECH
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  • Abstract
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Problems solved by technology

However, when the ceramic nanofiltration membrane with small pore size is grafted and modified, the chemical grafting modification will seriously reduce the pore size and porosity of the membrane, which is fatal to the permeation flux of the membrane.
[0005] Since there are only hydroxyl functional groups on the surface of the ceramic membrane, the available chemical grafting modification methods are limited and rely on organosilane coupling agents

Method used

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  • Ceramic membrane, chemical grafting modification method and application
  • Ceramic membrane, chemical grafting modification method and application
  • Ceramic membrane, chemical grafting modification method and application

Examples

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Embodiment 1

[0047] A sheet-type zirconia ceramic nanofiltration membrane (diameter 3 cm, film thickness 2 mm) with an average pore diameter of 2 nm was cleaned with deionized water, and dried at 110° C. for 6 hours. Dissolve 3-aminopropyltriethoxysilane in petroleum ether to prepare a 10 mmol / L modified solution, and stir evenly at room temperature. Through vacuum filtration, the ceramic membrane pores are filled with water. The wetted ceramic membrane was placed in a beaker, the bottom layer was put into deionized water, and the upper layer was poured into the modified petroleum ether solution. The surface of the ceramic membrane was at the interface of the two phases. Modified at 35°C for 4 hours. After the graft modification was completed, the membrane was taken out, the unreacted modifying reagent was washed away with ethanol, and dried at 110°C to obtain a surface-charged modified ceramic nanofiltration membrane. The structure of 3-aminopropyltriethoxysilane is as follows:

[0048]...

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Abstract

The invention relates to a ceramic membrane and an improved ceramic membrane chemical grafting modification method. A chemical modification layer exists on the surface of the ceramic membrane, no chemical modification layer is contained in pore channels of the inner wall, and the ceramic membrane shows good flux during liquid filtration. Meanwhile, according to the modification method provided by the invention, firstly, the ceramic membrane is filled with water through a vacuum pump, and then the surface of the membrane is placed at the interface of the organic solvent containing the silane modification liquid and the deionized water, so that the modified ceramic membrane with ideal surface properties is prepared. Through an interface chemical grafting modification method, the surface property of the ceramic membrane is adjusted, and the separation performance or the anti-pollution effect of the ceramic membrane is improved. Meanwhile, the grafting of the modified substance is limited in the surface area of the membrane, and only the aperture and porosity of the surface of the membrane are influenced. Compared with a modified membrane obtained by a traditional chemical grafting modification method, the modified membrane obtained by the method has the same modification effect, and meanwhile, attenuation of permeation flux is obviously reduced.

Description

technical field [0001] The invention belongs to the modification of membrane materials, and in particular relates to a method for modifying only the physical and chemical properties of the ceramic membrane surface. Background technique [0002] Ceramic membranes have the advantages of high temperature resistance, chemical corrosion resistance, and high mechanical strength, and are widely used in the separation process of harsh systems. However, because there is only a single hydroxyl functional group on the surface of the ceramic membrane, it has the characteristics of hydrophilic, oleophobic and weakly charged, which is not ideal for the separation of organic solvent systems and charged small molecules. Therefore, in order to make ceramic membranes suitable for more complex and diverse application systems, it is usually necessary to adjust their surface properties (roughness, hydrophilicity and hydrophobicity, and chargeability) through chemical modification. [0003] At p...

Claims

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Application Information

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IPC IPC(8): B01D69/10B01D69/02B01D67/00B01D61/00
CPCB01D69/10B01D69/02B01D67/0079B01D61/00Y02A20/131
Inventor 范益群邱鸣慧赵晨陈献富
Owner NANJING UNIV OF TECH
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