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Polyamide thin-layer composite reverse osmosis membrane and preparation method and application thereof

A technology of reverse osmosis membrane and polyamide, which is used in semi-permeable membrane separation, chemical instruments and methods, osmosis/dialysis water/sewage treatment, etc., to achieve the effects of intensifying interfacial polymerization, strong flexibility, and small pore size

Inactive Publication Date: 2020-06-09
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the deficiencies in the prior art, the primary purpose of the present invention is to provide a method for preparing a polyamide thin-layer composite reverse osmosis membrane, thereby solving the bottleneck problem of mutual checks and balances between the permeation flux and the salt interception rate of the composite reverse osmosis membrane , reduce operating costs and energy consumption, and prolong the service life of the membrane

Method used

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  • Polyamide thin-layer composite reverse osmosis membrane and preparation method and application thereof
  • Polyamide thin-layer composite reverse osmosis membrane and preparation method and application thereof
  • Polyamide thin-layer composite reverse osmosis membrane and preparation method and application thereof

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[0044]

[0045] The preparation method of polyamide thin layer composite reverse osmosis membrane of the present invention comprises the steps:

[0046] (1), Zn(NO 3 ) 2 ·6H 2 O, polyvinylpyrrolidone and pyrazine are dissolved in organic solvent and made into zinc nitrate solution, and middle-tetra(4-carboxyphenyl) porphine is dissolved in organic solvent and made into porphin solution, and porphin solution is stirred (100 -300rpm) into the zinc nitrate solution drop by drop, after mixing the two solutions, sonicate for 15-30min, react at 80-100°C for 12-24h, and synthesize metal-organic framework nanosheets Zn-TCPP;

[0047] (2), the metal organic framework nanosheet Zn-TCPP is centrifuged to obtain a purple precipitate, and vacuum-dried; Soxhlet extraction is performed with deionized water to remove the residual organic solvent in the Zn-TCPP, dried, and dissolved in an organic solvent In the process, the metal organic framework nanosheet solution (Zn-TCPP solution) was...

Embodiment 1

[0065] The preparation method of the polyamide thin-layer composite reverse osmosis membrane of the present embodiment comprises the following steps:

[0066] (1), 45mg Zn(NO 3 ) 2 ·6H 2 O, 200mg of polyvinylpyrrolidone and 8mg of pyrazine are dissolved in 150mL of N,N-dimethylformamide and the mixed solution of ethanol (volume ratio is 3:1) and are made into zinc nitrate solution; Carboxyphenyl) porphine is dissolved in 50mL N,N-dimethylformamide and ethanol mixed solution (volume ratio is 3:1) and is made into porphin solution; The zinc nitrate solution is stirred (150rpm) gradually Add dropwise into the porphin solution, and react at 80° C. for 24 hours after ultrasonication for 15 minutes to obtain metal-organic framework nanosheets Zn-TCPP.

[0067] (2), the metal organic framework nanosheet Zn-TCPP was centrifuged at 8000rpm for 8 minutes to obtain a purple precipitate, which was dried in vacuum for 12 hours; the obtained Zn-TCPP was subjected to Soxhlet extraction wi...

Embodiment 2

[0071] The preparation method of the polyamide thin-layer composite reverse osmosis membrane of the present embodiment comprises the following steps:

[0072] (1), 45mg Zn(NO 3 ) 2 ·6H 2 O, 200mg polyvinylpyrrolidone and 8mg pyrazine are dissolved in 90mL N,N-dimethylformamide and the mixed solution of ethanol (volume ratio is 3:1) and be made into in the zinc nitrate solution; -carboxyphenyl) porphine is dissolved in 30mL N, N-dimethylformamide and ethanol mixed solution (volume ratio is 3:1) and is made into porphine solution; Zinc nitrate solution is stirred (150rpm) Add dropwise into the porphin solution, and react at 80° C. for 24 hours after ultrasonication for 15 minutes to obtain metal-organic framework nanosheets Zn-TCPP.

[0073] (2), the metal organic framework nanosheet Zn-TCPP was centrifuged at 8000rpm for 8 minutes to obtain a purple precipitate, which was dried in vacuum for 12 hours; the obtained Zn-TCPP was subjected to Soxhlet extraction with deionized wa...

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Abstract

The invention provides a polyamide thin-layer composite reverse osmosis membrane as well as a preparation method and application thereof. The preparation method comprises the steps: preparing an ultrathin metal organic framework nanosheet zinc-meso-tetra(4-carboxyphenyl)porphin; ultrasonically dissolving the ultrathin metal organic framework nanosheet zinc-meso-tetra(4-carboxyphenyl)porphin in alcohol, performing filter pressing on a polyethersulfone ultrafiltration membrane through a filter pressing method to prepare an ultrathin middle layer, and soaking the composite membrane in a resorcinol aqueous solution and a n-hexane solution containing polybenzoyl chloride to form the polyamide thin-layer composite reverse osmosis membrane. The middle layer of the metal organic framework nanosheet can be used as a water permeation channel, so that the geometric resistance of water molecules infiltrating from a polyamide membrane to a polyether sulfone membrane is reduced, and the permeation rate of water in a polyamide thin-layer composite reverse osmosis membrane is increased; the ultrathin middle layer provides a good reaction container for formation of interfacial polymerization reaction, the surface area and crosslinking degree of the prepared polyamide membrane are increased, the internal thickness of the polyamide membrane is reduced, and the salt rejection rate is also improvedwhile the membrane flux is greatly increased.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a polyamide thin-layer composite reverse osmosis membrane and its preparation method and application. Background technique [0002] Reverse osmosis membrane separation technology is a new type of high-efficiency separation technology. It uses the selective permeability of reverse osmosis membrane and uses the pressure difference on both sides of the membrane as the driving force to achieve membrane separation. It has been applied in many fields, such as Brackish water treatment, seawater desalination and pure water preparation, etc. Polyamide thin-layer composite separation membrane has good stability and mechanical strength, chemical corrosion resistance, high separation performance, and is widely used in the field of reverse osmosis membrane separation. However, in the application process of polyamide thin-layer composite separation membrane technology, mem...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D69/02B01D71/56B01D67/00C02F1/44
CPCB01D67/0002B01D69/02B01D69/12B01D71/56C02F1/441
Inventor 王志伟文越张星冉吴志超
Owner TONGJI UNIV
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