Forward osmosis membrane with two-dimensional MOFs as middle layer and preparation method of forward osmosis membrane

A technology of intermediate layer and support layer, applied in semi-permeable membrane separation, chemical instruments and methods, osmotic/dialysis water/sewage treatment, etc., can solve the problems of low efficiency, easy pollution of TFC membrane, etc. Operational efficiency, strong interaction effect

Active Publication Date: 2022-02-22
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Existing modification methods cannot well solve the problem of low efficiency of TFC membranes due to the Trade-off effect between water permeability coefficient and retention performance and the easy-to-fouling characteristics.

Method used

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  • Forward osmosis membrane with two-dimensional MOFs as middle layer and preparation method of forward osmosis membrane
  • Forward osmosis membrane with two-dimensional MOFs as middle layer and preparation method of forward osmosis membrane
  • Forward osmosis membrane with two-dimensional MOFs as middle layer and preparation method of forward osmosis membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A method for preparing two-dimensional MOFs as a TFC-FO membrane of an intermediate layer, comprising the steps of:

[0041] (1) Preparation of two-dimensional MOFs dispersion: 92.23 mg of aluminum nitrate nonahydrate and 14 mg of polyvinylpyrrolidone were dissolved in 150 mL of N,N-dimethylformamide, which was stock solution A. Another 200mg of tetracarboxyphenylporphyrin was dissolved in 200mL of N,N-dimethylformamide, which was stock solution B. Then, the A and B stock solutions were mixed evenly in a glass bottle with a cap at a volume ratio of 2:1. The mixture was reacted at 120°C for 18h. After the reaction solution was cooled, the sample was collected by centrifugation, and the sample was washed three times with N,N-dimethylformamide and ethanol, respectively, to obtain the three-dimensional Al-MOF material. The three-dimensional Al-MOF material was dissolved in ethanol, and the two-dimensional Al-MOF material was obtained by ultrasonication at room temperature...

Embodiment 2

[0048] A method for preparing a TFC-FO membrane with two-dimensional MOFs as the middle layer, the difference from Example 1 is: under a pressure of 0.2 MPa, 125.6 mL of the dispersion is suction-filtered onto the polyethersulfone support layer. Subsequently, the film is fixed with a plate frame, and an appropriate amount (the amount is the same as in Example 1, the same below) of 2% m-phenylenediamine solution is poured on the surface of the film and soaked for 1 min. After soaking, use a rubber roller to remove the residual m-phenylenediamine solution on the film surface. , and then take an appropriate amount (the same amount as in Example 1, the same below) of 0.1% trimesoyl chloride solution and pour it onto the membrane surface to react for 2 minutes. After draining, place the membrane in a hot water bath at 100° C. for thermal crosslinking for 5 minutes. That is to obtain the TFC-FO membrane with the two-dimensional MOFs as the middle layer.

[0049] According to the tes...

Embodiment 3

[0053] A method for preparing a forward osmosis membrane with two-dimensional MOFs as the middle layer. The difference from Example 1 is that: under a pressure of 0.2 MPa, 188.4 mL of the dispersion is suction-filtered onto the polyethersulfone support layer. Then fix the membrane with a plate frame, take an appropriate amount of 2% m-phenylenediamine solution and pour it on the surface of the membrane to soak for 1 min. The acid chloride solution was poured onto the membrane surface to react for 2 minutes, and after draining, the membrane was placed in a hot water bath at 100°C for 5 minutes of thermal crosslinking to obtain the TFC-FO membrane with the two-dimensional MOFs as the middle layer.

[0054] According to the test method of Example 1, the water flux of the TFC-FO membrane that measures the two-dimensional MOFs as the intermediate layer is 23.4L m -2 h -1 , the reverse salt flux is 0.37g m -2 h -1 .

[0055] Compared with Comparative Example 1, the water flux of...

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Abstract

The invention discloses a forward osmosis membrane with two-dimensional MOFs as a middle layer and a preparation method of the forward osmosis membrane, and belongs to the technical field of water treatment. According to the invention, a polymer film is taken as a carrier, Al-MOF is taken as a middle layer material, an Al-MOF dispersion is deposited on a supporting layer in a vacuum suction filtration mode, and the TFC-FO film with two-dimensional MOFs as a middle layer is prepared through interfacial polymerization. The forward osmosis membrane with the two-dimensional MOFs as the middle layer breaks through the Trade-off effect, has the good characteristics of high water flux and high retention rate, is expected to be applied to a membrane separation process in a sewage treatment process, and has efficient salt retention performance while keeping high-flux operation.

Description

technical field [0001] The invention relates to a forward osmosis membrane with two-dimensional MOFs as an intermediate layer and a preparation method thereof, belonging to the technical field of water treatment. Background technique [0002] Polyamide composite films (TFC membranes) are mainly composed of a non-porous and highly cross-linked polyamide active layer (PA layer) and a porous support layer. Due to the advantages of stable performance, low preparation cost and large-scale production, TFC membranes occupy a leading position in the production and application of nanofiltration (NF), reverse osmosis (RO) and forward osmosis (FO) membranes. However, the trade-off effect between water permeability coefficient and interception performance and the easy-to-fouling characteristics severely restrict the development of TFC membranes. [0003] The properties of the PA layer have an important impact on the performance of the TFC membrane, and the optimization of the performan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D71/56B01D69/02B01D67/00C02F1/44
CPCB01D69/12B01D71/56B01D69/02B01D67/0002C02F1/445
Inventor 赵频刘浩王新华宋伟龙
Owner JIANGNAN UNIV
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