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Breathable and hydrophobic mixed matrix membrane and preparation method thereof

A mixed-matrix membrane, hydrophobic technology, applied in semi-permeable membrane separation, chemical instruments and methods, membranes, etc., can solve the problems such as literature reports on porous carbon microspheres that have not been found, and achieve good modifiability, improved anti-pollution performance, The effect of reducing the phenomenon of agglomeration

Active Publication Date: 2017-12-12
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Through the search, no literature reports on the application of porous carbon microspheres to the membrane field have been found

Method used

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  • Breathable and hydrophobic mixed matrix membrane and preparation method thereof
  • Breathable and hydrophobic mixed matrix membrane and preparation method thereof
  • Breathable and hydrophobic mixed matrix membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Preparation method of fluoroalkylation modified porous carbon microspheres:

[0040] ⑴ Dissolve 1.0g of porous carbon microspheres in a mixed acid consisting of 75ml of concentrated sulfuric acid and 25ml of concentrated nitric acid, heat and stir at 80°C, and 50Hz ultrasonic treatment to graft hydroxyl and carboxyl functional groups on the surface of porous carbon microspheres to obtain carboxylated Porous carbon microspheres;

[0041] (2) The carboxylated porous carbon microspheres were dissolved in 20ml of hexafluoroisopropanol, heated at 90°C and stirred, and catalyzed by concentrated sulfuric acid to obtain fluoroalkylated modified porous carbon microspheres.

Embodiment 2

[0043] Preparation of flat membrane:

[0044] Weigh 30g of PVDF powder, 120ml of solvent DMAc, 20ml of porogen, and 0.3g of fluoroalkylated modified porous carbon microspheres. Stir fully and dissolve at 75°C to keep the solution uniform and stable. Keep the temperature constant, stop stirring, stand for 12 hours to degas, and scrape a flat film on a flat glass plate.

[0045] Table 1 Performance data statistics of the prepared mixed matrix flat membrane

[0046]

Embodiment 3

[0048] Preparation of hollow fiber membrane:

[0049] Weigh 30 g of PVDF powder, 120 ml of solvent DMAc, 20 ml of porogen, and 0.3 g of fluoroalkylated modified porous carbon microspheres. Stir and dissolve at 75° C. to keep the solution uniform and stable. Keep the temperature constant, stop stirring, stand for 12 hours to degas and spin to prepare hollow fiber membranes. The main component of the coagulation bath liquid is water, and the spinning draft speed is 25 m / min. The core of the spinning nozzle is inserted into the tube to pass the core liquid. The obtained polyvinylidene fluoride hollow fiber separation membrane has an inner diameter of 800 μm and a fiber wall thickness of 200 μm. The membrane is distilled Flux 39.3kg / m 2 h.

[0050] Table 2 Performance data statistics of the prepared mixed matrix hollow fiber membranes

[0051]

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Abstract

The invention relates to a breathable hydrophobic mixed matrix membrane and a preparation method thereof. The method comprises a fluoroalkylation modification method on porous carbon microspheres and a method for preparing the hydrophobic mixed matrix membrane by doping the carbon microspheres into polymers. Micron-size activated carbon powder serves as the porous carbon microspheres, fluoroalkyl chains are grafted on the surface of the porous carbon microspheres sequentially through the processes of strong acid oxidization, fluoroalkylation and the like to obtain fluoroalkylation powder, and then the powder is mixed with the polymers, solvent, an additive and the like to form a membrane preparation solution and prepare the mixed matrix membrane.

Description

Technical field [0001] The invention belongs to the technical field of membranes, and relates to the improvement of the performance and structure of polymer separation membranes, in particular to a breathable and hydrophobic mixed matrix membrane using fluoroalkylated modified porous carbon microspheres as inorganic additives and a preparation method thereof. Background technique [0002] With the development of membrane technology, membrane separation has been more and more widely used in all aspects of production and life. Membrane separation technology can not only effectively purify wastewater, but also recover useful substances. It also has the characteristics of energy saving, simple equipment, and convenient operation. Therefore, it has been widely used in wastewater treatment and has shown broad development prospects. The introduction of inorganic components into the polymer separation membrane can not only improve and modify the pore structure and distribution of the mem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/82B01D71/02B01D71/06B01D69/02B01D69/08
CPCB01D69/02B01D69/08B01D71/021B01D71/06B01D71/82B01D2323/04B01D2323/12B01D2323/36B01D2325/38
Inventor 武春瑞孙学超吕晓龙唐文勇赵丽华
Owner TIANJIN POLYTECHNIC UNIV