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Anti-pollution and high-flux modified polymer separation membrane and preparation method thereof

A polymer and separation membrane technology, applied in semi-permeable membrane separation, chemical instruments and methods, membranes, etc., can solve the problems of harsh reaction conditions, increase the application cost of separation membranes, and difficult to control the reaction effectively, and achieve simple equipment. , to achieve large-scale industrial application, the effect of water content improvement

Pending Publication Date: 2021-07-09
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods of chemical grafting to modify the surface of the grafted polymer membrane have achieved positive experimental results in terms of hydrophilicity and anti-fouling properties. However, there are also various defects, such as harsh conditions for the grafting reaction. , the reaction is difficult to effectively control, the grafting efficiency is not ideal, a large amount of catalysts and initiators are used, etc.
This will undoubtedly increase the cost of separation membrane applications, and such complex experimental conditions are also an insurmountable challenge for large-scale industrial applications
In addition, although the anti-pollution of sewage solution after grafting is improved, and the decline of membrane flux is slowed down when filtering sewage solution, there is still no breakthrough. The water flux when filtering sewage solution is significantly lower than that of filtering pure water. This limitation of water flux when

Method used

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  • Anti-pollution and high-flux modified polymer separation membrane and preparation method thereof
  • Anti-pollution and high-flux modified polymer separation membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] First, prepare 500 mL of ferrous ammonium sulfate aqueous solution with a mass fraction of 0.1% with deionized water. The function of ferrous ammonium sulfate is to prevent homopolymerization of monomers in the solution. Then, drop 2.5g of acrylic acid in the ferrous ammonium sulfate aqueous solution that is prepared (in order to prevent acrylic acid from reacting in the air, when dropping, the tail of the dropping tube should extend below the liquid level of the ferrous ammonium sulfate aqueous solution ), that is, the grafting solution is prepared.

[0042] In the stage of preparing PVDF membrane, the PVDF with non-woven support with a pore size of 0.1 μm was cut into a membrane with a size of 10 cm×10 cm, rinsed with deionized water, and then soaked in deionized water for 24 hours. Then, put the clean PVDF membrane into the radiant tube, and add 200 mL of grafting solution into the radiant tube. The radiant tube was sealed with petroleum jelly and filled with nitrog...

Embodiment 2

[0044] First, prepare 500 mL of ferrous ammonium sulfate aqueous solution with a mass fraction of 0.1% with deionized water. The function of ferrous ammonium sulfate is to prevent homopolymerization of monomers in the solution. Then, in the ferrous ammonium sulfate aqueous solution that prepares, drop 3g acrylamide (in order to prevent acrylamide from reacting in the air, when dripping, the tail of the dropping tube should extend into the liquid level of the ferrous ammonium sulfate aqueous solution Below), the grafting solution is prepared.

[0045] In the stage of preparing PVDF membrane, the PVDF with non-woven support with a pore size of 0.1 μm was cut into a membrane with a size of 10 cm×10 cm, rinsed with deionized water, and then soaked in deionized water for 24 hours. Then, put the clean PVDF membrane into the radiant tube, and add 200 mL of grafting solution into the radiant tube. The radiant tube was sealed with petroleum jelly and filled with nitrogen for 30 min to...

Embodiment 3

[0047] First, 500 mL of ferrous ammonium sulfate aqueous solution with a mass fraction of 0.3% was prepared with deionized water. The function of ferrous ammonium sulfate was to prevent homopolymerization of monomers in the solution. Then, add 1g of acrylic acid and 2g of acrylamide dropwise to the prepared ferrous ammonium sulfate aqueous solution (in order to prevent the monomer from reacting in the air, when dropping, the tail of the dropping tube should extend into the ferrous ammonium sulfate aqueous solution below the liquid level), that is, the grafting solution is prepared.

[0048] In the stage of preparing PVDF membrane, the PVDF with non-woven support with a pore size of 0.1 μm was cut into a membrane with a size of 10 cm×10 cm, rinsed with deionized water, and then soaked in deionized water for 24 hours. Then, put the clean PVDF membrane into the radiant tube, and add 200 mL of grafting solution into the radiant tube. The radiant tube was sealed with petroleum jel...

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Abstract

The invention relates to an anti-pollution and high-flux modified polymer separation membrane and a preparation method thereof. The preparation method comprises the following steps of adding an acrylic monomer into an ammonium ferrous sulfate aqueous solution to prepare a grafting solution, and putting a polymer separation membrane into the grafting solution, introducing inert gas to remove oxygen, and carrying out electron beam radiation grafting to prepare the modified polymer separation membrane. The acrylic monomer is grafted on the polymer separation membrane through radiation, so that the hydrophilicity of the membrane is obviously improved, and the water content exceeds 3-5 times of that before modification; when the modified polymer separation membrane is used for filtering a BSA solution, the water flux is improved by 20-50% compared with the water flux when pure water is filtered, the flux decline rate is remarkably reduced, and the pollution resistance of the membrane is remarkably improved. The preparation method provided by the invention is simple to operate, low in cost and easy to realize industrial application, and has important significance in promoting the application of the separation membrane.

Description

technical field [0001] The invention relates to the technical field of surface modification of polymer separation membranes, in particular to an anti-pollution, high-throughput modified polymer separation membrane and a preparation method thereof. Background technique [0002] Membrane separation technology, which emerged in the 1960s, has many advantages, such as high efficiency, high selectivity, small footprint, low cost, and low energy consumption. Due to its outstanding filtration and separation performance, it has played and is playing a huge role in the field of water treatment. [0003] However, membrane fouling is a bottleneck problem that restricts the wide application of membrane wastewater treatment technology. Membrane fouling will lead to a serious decline in membrane filtration performance and affect filtration efficiency. Backwashing and chemical cleaning can remove membrane fouling to a certain extent, but it will undoubtedly increase the operating cost and...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D69/02
CPCB01D67/0093B01D67/009B01D69/02B01D2325/36
Inventor 林红军申利国
Owner ZHEJIANG NORMAL UNIVERSITY
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