Preparation method of self-supporting composite nanofiltration membrane

A composite nanofiltration membrane, self-supporting technology, applied in the field of nanofiltration membranes, can solve the problems of stability limiting the development of two-dimensional graphene-based membranes, increasing the length of molecular transport paths, affecting membrane permeability, etc., and achieving good long-term operation and stability. performance and strong alkali resistance, good application value, and the effect of prolonging the service life

Active Publication Date: 2022-07-01
TIANJIN POLYTECHNIC UNIV
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  • Description
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Problems solved by technology

The improvement of membrane separation performance is mainly due to the thinning of the separation layer and the improvement of surface hydrophilicity after the two-dimensional material is embedded in the separation layer. Compared with other nanomaterials, there is no obvious advantage, and the corresponding agglomeration and accompanying defects will also affect separation performance
Although the two-dimensional graphene-based film prepared by constructing additional water channels has ideal application prospects, the defects of two-dimensional graphene layered films are usually reduced by increasing the number of layers of graphene materials, but at the same time it will also increase the number of layers of two-dimensional graphite The length of the molecular transport path in the ene layered film affects the permeability of the film, and the stability of the two-dimensional graphene layered film in water or other solvents is also the main factor limiting the development of the two-dimensional graphene-based film.

Method used

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Examples

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Embodiment 1

[0029] A preparation method of a self-supporting composite nanofiltration membrane, comprising the following steps:

[0030] (1) preparation of aminated graphene quantum dots: 45mg graphene oxide was dispersed in 45mL distilled water through ultrasonic vibration, 15mL ammonia water was added and mixed, and then transferred to the reactor, the reactor was sealed and placed in the muffle furnace, in 120 ℃ constant temperature reaction 5h. After cooling, it was filtered with a sand core filter equipped with a polyethersulfone membrane (pore size: 0.22 μm), and then the filtrate was distilled under reduced pressure in a water bath at 80 °C for 1 h, and then freeze-dried to obtain aminated graphene quantum dot powder. After redissolving, it was filtered with a polyethersulfone filter membrane (pore size 0.1 μm) for a second time, and then freeze-dried again to obtain a pale yellow aminated graphene quantum dot powder. The transmission electron microscope image is as follows. figur...

Embodiment 2

[0035] A preparation method of a self-supporting composite nanofiltration membrane, comprising the following steps:

[0036] (1) step (1) with embodiment 1;

[0037] (2) except that the interfacial polymerization reaction time is 10s, all other steps and conditions are the same as the step (2) of embodiment 1;

[0038] (3) Preparation of composite nanofiltration membrane: Immediately after step (2), 1.5 mL of a 0.02w / v% piperazine aqueous solution with a concentration of 0.02w / v% was injected into the solution after the interfacial polymerization reaction in step (2) at a constant speed, and the reaction was continued for 60s to prepare The porous graphene / polyamide separation layer was obtained, and after removing the aqueous phase solution and the organic phase solution, the porous graphene / polyamide separation layer was loaded on the polyethersulfone filter membrane substrate, and the obtained composite membrane was heat-treated at 45 °C for 10 min to prepare. Obtained fro...

Embodiment 3

[0041] A preparation method of a self-supporting composite nanofiltration membrane, comprising the following steps:

[0042] (1) step (1) with embodiment 1;

[0043] (2) except that the interfacial polymerization reaction time is 30s, all other steps and conditions are the same as the step (2) of embodiment 1;

[0044] (3) with step (3) of embodiment 2.

[0045] The prepared self-supporting composite nanofiltration membrane was 0.1 g L -1 Congo red and methyl orange solution system and 1g L -1 Na 2 SO 4 The solution system was tested under 0.2MPa pressure, and its permeation flux was 13.8L m -2 ·h -1 ·bar -1 , the rejection rate of Congo red is 99.5%, the rejection rate of methyl orange is 38.6%, SO 4 2- The rejection rate of ions is 30.2%, Congo red / SO 4 2- The separation factor is 92.13.

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Abstract

The invention discloses a preparation method of a self-supporting composite nanofiltration membrane, which comprises the following steps: by taking aminated graphene quantum dots as a main body, preparing a porous graphene-based two-dimensional sheet material through interfacial polymerization reaction between the aminated graphene quantum dots and multi-element acyl chloride; and then in-situ packaging the porous graphene-based two-dimensional sheet material by using polyamide through an in-situ packaging technology to prepare the self-supporting porous graphene/polyamide separation layer with excellent permeability and high selectivity. The self-supporting composite nanofiltration membrane prepared by the method overcomes the Trade-off effect of a traditional polymer membrane material, shows excellent permeation flux, separation performance and dye desalting capacity, has excellent strong alkali resistance and long-term operation stability, obviously prolongs the service life of the membrane, and is suitable for industrial production. The method has good practical value in the fields of industrial wastewater treatment, dye desalination, chemical separation and the like.

Description

technical field [0001] The invention relates to the field of nanofiltration membranes, in particular to a preparation method of a self-supporting composite nanofiltration membrane. Background technique [0002] As an efficient, energy-saving and environmentally friendly separation technology, membrane separation technology has become an important technology to solve the problems of energy, resources and environmental pollution. At present, polymer membrane materials have developed into one of the main forms of commercial separation membrane materials due to their simple and efficient membrane formation and excellent separation performance. However, there is a "Trade-off" effect between permeability and selectivity. Therefore, it still faces certain challenges in practical applications. [0003] In recent years, more and more researchers have devoted themselves to the development of new membrane materials such as metal-organic frameworks, covalent organic frameworks, two-dim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D71/02B01D69/12B01D69/10B01D69/02B01D67/00
CPCB01D71/56B01D71/021B01D69/125B01D69/10B01D69/02B01D67/0079Y02A20/131
Inventor 刘海亮崔浩王永辉秦杨孙昱旻
Owner TIANJIN POLYTECHNIC UNIV
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