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Method for preparing nanometer material mixed matrix membrane

A technology of mixed matrix membranes and nanomaterials, applied in chemical instruments and methods, membrane technology, semipermeable membrane separation, etc., can solve the problems of difficulty in controlling the coverage of nanomaterials, easy aggregation of nanomaterials, filtration and retention performance of mixed matrix membranes Adverse effects and other issues, to achieve the effect of easy control of coverage, high firmness, and not easy to gather

Inactive Publication Date: 2012-11-07
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main disadvantage of this method is that the nanomaterials are prone to aggregation, which adversely affects the filtration and retention performance of the mixed matrix membrane; at the same time, the coverage of the nanomaterials on the membrane surface is not easy to control

Method used

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  • Method for preparing nanometer material mixed matrix membrane
  • Method for preparing nanometer material mixed matrix membrane
  • Method for preparing nanometer material mixed matrix membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] refer to image 3 , the preparation method of the present embodiment comprises two steps:

[0046] Step 1. Prepare the microporous intermediate layer implanted with nanomaterials:

[0047] The nanometer material is aluminum oxide.

[0048] In the method for implanting nanomaterials on the surface of the microporous intermediate layer in the step 1, the "in situ implantation" method is used to implant the nanomaterials on the surface of the microporous intermediate layer while preparing the microporous intermediate layer;

[0049] The material of the microporous intermediate layer is polysulfone PSf, and the average particle diameter of the particles is 100 nanometers.

[0050] Step 2, preparing a filter cortex on the surface of the microporous middle layer implanted with nanomaterials.

[0051] The "in situ implantation" method is: while preparing the microporous interlayer, the nanomaterial is implanted in situ on the surface of the microporous interlayer, which can b...

Embodiment 2

[0061] refer to Figure 4 , the preparation method of the present embodiment comprises two steps:

[0062] Step 1, preparing a microporous intermediate layer implanted with nanomaterials;

[0063] The microporous interlayer is prepared by "non-solvent-induced phase separation method NIPS", and then the nanomaterials are implanted on the surface of the microporous interlayer by "physical coating method";

[0064] The microporous intermediate layer material is polyetherimide PEI, and the nanometer material is carbon nanotubes, the average length of carbon nanotubes is 200 nanometers, and the average diameter is 1 nanometer.

[0065] The "non-solvent-induced phase separation method" for preparing the microporous intermediate layer is implemented in this embodiment as follows: 18 grams of polyetherimide is dissolved in 82 grams of dimethylformamide DMF to form a casting solution ; Before film formation, the casting solution is evenly coated on the non-woven polyester cloth with ...

Embodiment 3

[0075] refer to Figure 5 , the preparation method of the present embodiment comprises two steps:

[0076] Step 1, preparing a microporous intermediate layer implanted with nanomaterials;

[0077] While preparing the microporous middle layer, the "in situ implantation" method is used to implant nanomaterials into the surface of the microporous middle layer;

[0078] The material of the microporous intermediate layer is polysulfone PSf, the nano material is zeolite, and the average particle size of the particles is 100 nanometers.

[0079] The microporous intermediate layer is prepared by the non-solvent-induced phase separation method NIPS: 18 grams of polysulfone is dissolved in 82 grams of N-methylpyrrolidone NMP to form a casting solution; before film formation, the casting solution is evenly coated The cloth is on the non-woven polyester cloth, and the thickness is 100 microns; The non-solvent phase is water containing 0.15% nanometer zeolite particles in mass ratio, and...

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Abstract

The invention relates to a method for preparing a nanometer material mixed matrix membrane, which comprises two steps: 1, a micropore intermediate layer implanted with nanometer materials is prepared; and 2, a filter cortex is prepared on the surface of the micropore intermediate layer implanted with the nanometer materials. According to the method disclosed by the invention, the nanometer materials on the membrane surface have high firmness, and do not drop easily in an application process, and the nanometer materials are uniformly distributed on the membrane surface and are not gathered easily. In addition, the coverage rate of the nanometer materials on the membrane surface is easy to control, so that the functions of the nanometer materials can be fully exerted, and harms on the filtering performance of the membrane can not be caused.

Description

technical field [0001] The invention relates to the technical field of preparation of a composite membrane, in particular to a preparation method of a nanomaterial mixed matrix membrane. Background technique [0002] High-pressure membranes such as reverse osmosis membranes and nanofiltration membranes have extensive and irreplaceable applications in many fields such as drinking water treatment and sewage reuse. Due to its high membrane flux and extremely high rejection rate for dissolved organic matter, composite membrane is currently the most important form of high pressure membrane. Composite membranes have basically become the industry standard for high-pressure membrane preparation. [0003] The structural feature of the composite membrane is that the microporous middle layer which plays a supporting role and the filtering skin layer which plays a filtering role are separately prepared, that is, the microporous middle layer is prepared first, and then the filtering ski...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D69/12B01D67/00
Inventor 王小杨宏伟解跃峰
Owner TSINGHUA UNIV
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