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Metal-organic framework nanosheet modified forward osmosis film and preparation method and application thereof

Active Publication Date: 2019-01-04
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Mixing nanomaterials (such as carbon nanotubes, graphene oxide, etc.) into the active layer for modification is a method commonly used in recent years to improve the flux of forward osmosis membranes. main component) poor compatibility, resulting in the reduction of the salt rejection rate of the traditional nanomaterial modified forward osmosis membrane, J s (salt backmixing amount) / J w (water flux) value increases

Method used

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  • Metal-organic framework nanosheet modified forward osmosis film and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Preparation of copper-terephthalic acid metal-organic framework nanosheets: 10 g / L concentration of terephthalic acid (McLean) was dissolved in acetonitrile (Aladdin) and N,N-dimethylformamide (Aladdin) 2: Obtain solution A in the solvent of 1, and solution B is the solvent of acetonitrile and N, N-dimethylformamide 1:1, and 10g / L copper nitrate trihydrate (McLean) is dissolved in acetonitrile and N, N-dimethylformamide Solution C was obtained in the solvent of methyl formamide 1:2, and slowly added in the test tube in the order of solutions A, B, and C at a ratio of 3:2:3 to avoid complete mixing, and then stood at 40°C for 24 hours , and the precipitates are copper-terephthalic acid metal organic framework nanosheets.

[0040] Material characterization: After washing the nanosheets with N,N-dimethylformamide and dichloromethane (Aladdin) three times, disperse them in dichloromethane, ultrasonically disperse them for 30 minutes, then disperse the nanosheets-dichloromet...

Embodiment 2

[0043]Preparation of the support layer of the forward osmosis membrane: the composition of the casting solution of the support layer is 12wt% polyethersulfone (BASF), no porogen is added, dissolved in N,N-dimethylformamide; after 8 hours of dissolution at 40°C , put it in a 40°C oven for 1 day to defoam, form a uniform mixed solution, pour it onto a glass plate, scrape the film with a scraper with a height of 200 μm, and then place it in a deionized hydrogel bath for phase Transformation, the membrane automatically falls off from the glass plate, and the support layer for the forward osmosis membrane can be obtained.

Embodiment 3

[0045] Preparation of copper-terephthalic acid metal-organic framework nanosheets modified forward osmosis membrane: metal-organic framework nanosheets were added to 0.05wt% trimesoyl chloride (Aladdin) in n-hexane at a ratio of 0.12wt / v% (Aladdin) solution, ultrasonic 30min to form a uniformly dispersed solution. Treat the support layer in 2.0wt% m-phenylenediamine (Aladdin) aqueous solution for 2min, remove excess droplets on the surface of the support layer with an air knife, and then treat the surface of the support layer with trimesoyl chloride-n-hexane solution of nanosheets for 30s , Pour off the solution, and finally treat the membrane in hot water at 80°C for 1 min.

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Abstract

The invention discloses metal-organic framework nanosheet modified forward osmosis film and a preparation method and application thereof. metal-organic framework nanosheets are introduced to an interfacial polymerization process for active layer preparation; a polyamide active layer containing metal-organic framework nanosheets is formed in situ on a support layer. An organic ligand to synthesizethe metal-organic framework nanosheets is terephthalic acid so that the metal-organic framework nanosheets have excellent hydrophilicity; compared with traditional inorganic nano materials, the metal-organic framework nanosheets are well compatible with polyamide film; extra pores are provided for mass transfer of the forward osmosis film polyamide active layer; water flux of the film can be further increased in the actual forward osmosis process; a higher water flux is attained under equal osmotic pressure, salt return mixing amount is lower, and anti-pollution performance is good.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a forward osmosis membrane modified by metal-organic framework nanosheets and a preparation method and application thereof. Background technique [0002] As an emerging technology, forward osmosis membrane has the advantages of anti-pollution and low energy consumption compared with reverse osmosis technology, and has good application prospects in seawater desalination, wastewater treatment, pharmaceutical industry, aerospace and other fields. Forward osmosis is the process of using high-concentration draw solution to generate high osmotic pressure to force low-concentration raw material solution to pass through a semi-permeable membrane. In addition to operating conditions, the treatment efficiency (water flux and salt backmixing) of this process mainly depends on the membrane material. itself. [0003] At present, forward osmosis is commonly used in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/10B01D69/12B01D67/00
CPCB01D67/0002B01D67/0006B01D69/10B01D69/12
Inventor 王志伟戴若彬王巧英吴志超
Owner TONGJI UNIV
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