Method for preparing porous nanoparticle/polydimethylsiloxane membrane through water surface spreading

A technology of dimethylsiloxane membrane and polydimethylsiloxane, which is applied in the field of membrane separation, can solve the problems of easy falling off of particles, inability to control the phenomenon of liquid casting and seepage, and reduced operation stability.

Pending Publication Date: 2021-10-19
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The traditional preparation method of mixed matrix composite membrane is mostly to apply the fluid mixed matrix material on the porous support body, which cannot control the permeation phenomenon caused by liquid casting; during the preparation process, if the particle size of the doped filler is larger than the support body , during the permeation process, the polymer cannot flow into the pores of the porous support, so that the filler and the polymer are separated, and some particles float on the surface of the membrane. During the pervaporation operation, some particles are easy to fall off, resulting in certain surface defects. Reduced loading of fillers reduces the operational stability of the membrane

Method used

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  • Method for preparing porous nanoparticle/polydimethylsiloxane membrane through water surface spreading
  • Method for preparing porous nanoparticle/polydimethylsiloxane membrane through water surface spreading

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Membrane preparation method:

[0032] (1) Pre-crosslinking of polydimethylsiloxane casting solution

[0033] Dissolve 2g of polydimethylsiloxane in 18g of n-heptane, stir for 3 hours, add 0.2g of crosslinking agent ethyl orthosilicate, stir for a period of time, add 0.005g of dibutyltin dilaurate, in a water bath at 60°C Stir in medium for 3h;

[0034] (2) Pre-crosslinking of covalent organic framework COF-LZU8 / polydimethylsiloxane casting solution

[0035] Add 0.05wt% covalent organic framework COF-LZU8 particles into the polydimethylsiloxane casting solution, continue to stir for 30 minutes, and sonicate for 30 minutes, repeating 3 times.

[0036] (3) Preparation of covalent organic framework COF-LZU8 / polydimethylsiloxane composite film by water surface spreading method

[0037]Rinse the surface of the polysulfone base membrane (20nm pore size) with deionized water for 1min, place it in a vacuum filter bottle equipped with deionized water and filter it for 5h; pour...

Embodiment 2

[0040] Membrane preparation method:

[0041] (1) Pre-crosslinking of polydimethylsiloxane casting solution

[0042] Dissolve 2g of polydimethylsiloxane in 18g of n-heptane, stir for 3 hours, add 0.2g of crosslinking agent ethyl orthosilicate, stir for a period of time, add 0.005g of dibutyltin dilaurate, in a water bath at 60°C Stir in medium for 3h;

[0043] (2) Pre-crosslinking of covalent organic framework COF-LZU8 / polydimethylsiloxane casting solution

[0044] Add 0.1wt% covalent organic framework COF-LZU8 particles into the polydimethylsiloxane casting solution, continue to stir for 30 minutes, and sonicate for 30 minutes, repeating 3 times.

[0045] (3) Preparation of covalent organic framework COF-LZU8 / polydimethylsiloxane composite film by water surface spreading method

[0046] Rinse the surface of the polysulfone base membrane (20nm pore size) with deionized water for 1min, place it in a vacuum filter bottle equipped with deionized water and filter it for 5h; pour...

Embodiment 3

[0049] Membrane preparation method:

[0050] (1) Pre-crosslinking of polydimethylsiloxane casting solution

[0051] Dissolve 2g of polydimethylsiloxane in 18g of n-heptane, stir for 3 hours, add 0.2g of crosslinking agent ethyl orthosilicate, stir for a period of time, add 0.005g of dibutyltin dilaurate, in a water bath at 60°C Stir in medium for 3h;

[0052] (2) Pre-crosslinking of covalent organic framework COF-LZU8 / polydimethylsiloxane casting solution

[0053] Add 0.15wt% covalent organic framework COF-LZU8 particles into the polydimethylsiloxane casting solution, continue to stir for 30 minutes, and sonicate for 30 minutes, repeating 3 times.

[0054] (3) Preparation of covalent organic framework COF-LZU8 / polydimethylsiloxane composite film by water surface spreading method

[0055] Rinse the surface of the polysulfone base membrane (20nm pore size) with deionized water for 1min, place it in a vacuum filter bottle equipped with deionized water and filter it for 5h; pou...

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Abstract

The invention discloses a method for preparing a porous nanoparticle/polydimethylsiloxane membrane through water surface spreading, belonging to the technical field of membrane separation. Porous nanoparticles are added into a polydimethylsiloxane membrane casting solution for dispersion, and a mixed matrix membrane casting solution is immiscible with water and can be spread on a water surface to form a thin film, so the mixed matrix membrane casting solution is crosslinked on a liquid-liquid interface and assembled into the porous nanoparticle/polydimethylsiloxane composite membrane. A water surface spreading method avoids the phenomenon of pore permeation, improves the loading capacity of the porous nanoparticles, reduces the surface defects of the membrane, reduces the thickness of an active layer at the top of the composite membrane, and increases the flux and selectivity of the pervaporation membrane. The invention provides the two-step preparation method consisting of forming the thin film on a liquid-liquid interface in advance by a porous nanoparticle/polydimethylsiloxane mixed matrix material and then compounding the thin film with a porous support body; and the method is simple and easy to operate, mild in preparation conditions and low in cost.

Description

technical field [0001] The invention relates to a method and application for preparing a porous nanoparticle / polydimethylsiloxane composite membrane used for pervaporation preferentially permeating organic matter through a water surface spreading method, and belongs to the technical field of membrane separation. Background technique [0002] Compared with traditional separation methods such as extraction, distillation and rectification, membrane separation technology has incomparable advantages such as low energy consumption, environmental protection, high efficiency, simple equipment and easy amplification, and less by-products during operation. Widely used in energy saving and emission reduction, seawater desalination, food and medicine and other fields. Membrane separation technology will become an effective method to alleviate resource scarcity, environmental crisis and energy consumption, and further promote the development of society, economy and technology. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/12B01D71/70B01D61/36
CPCB01D67/0013B01D67/0079B01D69/125B01D71/70B01D61/362
Inventor 安全福李翀李杰曹腾旋蔡鹏王乃鑫
Owner BEIJING UNIV OF TECH
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