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A kind of anti-pollution oil-water separation ultrafiltration membrane modified by gel microspheres and its preparation method

A technology for gel microspheres and oil-water separation, applied in separation methods, immiscible liquid separation, liquid separation, etc., can solve problems such as the stability of composite membranes, achieve high membrane flux recovery rate, improve hydrophilicity, Enhanced effect of anti-oil droplet adsorption ability

Active Publication Date: 2021-05-28
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the modified membrane prepared by this method is used in the field of oil-water emulsion separation membrane, the stability of the composite membrane will be affected during use in different acid-base environments.

Method used

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  • A kind of anti-pollution oil-water separation ultrafiltration membrane modified by gel microspheres and its preparation method
  • A kind of anti-pollution oil-water separation ultrafiltration membrane modified by gel microspheres and its preparation method
  • A kind of anti-pollution oil-water separation ultrafiltration membrane modified by gel microspheres and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Synthesis of P(MAAc-co-MAAm) gel microspheres:

[0033] 1) Add MAAc (0.50g), MAAm (0.50g) and 50mL distilled water into a three-necked flask (volume 250mL, 70°C water bath);

[0034] 2) Add a spherical condenser tube and a mechanical stirring paddle to the three-necked flask to assemble the experimental device, start stirring and feed N 2 Deoxygenation for 30 minutes;

[0035] 3) Add AIBN (0.05g) to the above stirred mixture and react for 270min;

[0036] 4) After the reaction is completed, place it in a dialysis bag for dialysis for more than 2 days, and change the water every 12 hours;

[0037] 5) Put the above-dialyzed gel microspheres into a 1000 mL beaker, add 800 mL of distilled water and 150 mL of absolute ethanol; the prepared gel microspheres are ready for use.

[0038] (2) Preparation of anti-pollution oil-water separation membrane:

[0039] 1) Rinse the original commercial PVDF membrane with a pore size of 0.1 μm and a diameter of 5 cm with methanol s...

Embodiment 2

[0046] (1) Synthesis of P(MAAc-co-MAAm) gel microspheres: Same as Example 1.

[0047] (2) Preparation of anti-pollution oil-water separation membrane:

[0048] 1) Put the PVDF commercial original membrane with a pore size of 0.22 μm and a diameter of 5 cm in methanol solution for cleaning;

[0049] 2) Soak the cleaned PVDF membrane in a methanol solution of benzophenone (0.4mol / L), take it out after 1.5h and dry it naturally;

[0050] 3) Make a mixed solution of AA (0.6g), FAS (0.05g) and 50mL distilled water, then put it in a ziplock bag, blow nitrogen for 30min, immerse the dried PVDF membrane, and seal it for storage;

[0051] 4) Put the sealed ziplock bag under a 300W ultraviolet lamp, take out the film after irradiating for 15 minutes, and soak the film with a mixed solution of methanol and water to remove unreacted monomers;

[0052] 5) Place the membrane in a sand core filter, pour 30mL of gel microsphere solution during the vacuum filtration process, and the gel micr...

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Abstract

The invention relates to an anti-pollution oil-water separation ultrafiltration membrane modified by gel microspheres and a preparation method thereof. Random copolymers are formed by free radical polymerization, and a physically cross-linked network structure is formed by hydrogen bonding supramolecular self-assembly between the side groups of the molecular chains. The particle size of the microspheres can be adjusted in the range of 50-500nm; The carboxylation (‑COOH) modification was carried out by the branch polymerization method, and the amide group (‑CONH) on the surface of the microspheres 2 ) are linked by hydrogen bonding. The invention provides a new idea for the hydrophilic modification of the surface of the hydrophobic ultrafiltration membrane and its use in oil-water separation. The modified membrane has good hydrophilicity and underwater oleophobicity. It can effectively reduce the adhesion of oil droplets on the membrane surface and is expected to be used for the separation of oil-in-water emulsions.

Description

technical field [0001] The invention belongs to a method for preparing a modified polymer membrane material in the field of water treatment, in particular to a gel microsphere-modified anti-pollution oil-water separation ultrafiltration membrane and a preparation method thereof. Background technique [0002] With the rapid development of industrial technology, the oily sewage produced in the production processes of petroleum, daily chemical, textile, leather and electroplating has increased year by year, but the treatment of oily sewage has not been completely solved. Oily sewage can be divided into slick oil, dispersed oil, emulsified oil, and dissolved oil according to the particle size of oil droplets. The emulsified oil can exist stably and is difficult to merge into large oil droplets due to the wrapping of surfactants. It is also difficult to separate it from waste water by standing method. In order to effectively reduce oil-water pollution, oil-water mixtures, especi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/34B01D71/26B01D69/02B01D67/00B01D17/022
CPCB01D17/02B01D67/0002B01D69/02B01D71/26B01D71/34B01D2325/36
Inventor 付维贵李国霞张乐毅冯浩然翟高伟孙宝山赵义平陈莉
Owner TIANJIN POLYTECHNIC UNIV
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