Preparation method of two-dimensional temperature-sensitive metal organic framework nanosheet-based filter membrane

A technology of metal-organic frameworks and nanosheets, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as lack of intelligent response performance, achieve a good industrial production foundation, be environmentally friendly, and be easy to batch Effect

Active Publication Date: 2019-06-07
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

"American Chemical Society Applied Materials and Interfaces" (ACS Applied Materials & Interfaces, 2017, 9: 28079-28088) used two-dimensional metal-organic framework nanosheets to form a membrane by suction filtration, and obtained a filter membrane with excellent separation performance, but it does not have intelligent response performance

Method used

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  • Preparation method of two-dimensional temperature-sensitive metal organic framework nanosheet-based filter membrane
  • Preparation method of two-dimensional temperature-sensitive metal organic framework nanosheet-based filter membrane
  • Preparation method of two-dimensional temperature-sensitive metal organic framework nanosheet-based filter membrane

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Experimental program
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Effect test

Embodiment 1

[0033] (1) 20g zinc nitrate, 3.6g pyrazine, and 80g polyvinylpyrrolidone / polyvinylcaprolactam (mass ratio 3 / 1, polyvinylpyrrolidone molecular weight 30000-40000, purchased from Aladdin Company; polyvinylcaprolactam molecular weight 4000 -6000, prepared by free radical polymerization of vinyl caprolactam, raw materials purchased from Aladdin Company) was dissolved in 36L dimethylformamide / ethanol (volume ratio 3 / 1) mixed solvent to obtain solution A.

[0034] (2) Dissolve 12 g of tetrakis(4-carboxyphenyl) porphine in 12 L of dimethylformamide / ethanol (volume ratio 3 / 1) mixed solvent to obtain solution B.

[0035] (3) Solution A and solution B were mixed, sonicated for 30 min, followed by solvothermal reaction at 80° C. for 16 h. The product was centrifuged and washed three times with ethanol to obtain two-dimensional temperature-sensitive metal-organic framework nanosheets modified with polymers on the surface.

[0036] (4) A thin film was prepared on a cellulose-based membran...

Embodiment 2

[0040] (1) 10g zinc chloride, 1.8g pyrazine, and 50g polyvinylpyrrolidone / polyvinylcaprolactam (mass ratio 2 / 1, polyvinylpyrrolidone molecular weight 8000-12000, purchased from Aladdin Company; polyvinylcaprolactam molecular weight 2000-3000, prepared by free radical polymerization of vinyl caprolactam, raw materials purchased from Aladdin Company) dissolved in 18L dimethylformamide / ethanol (volume ratio 3 / 1) mixed solvent to obtain solution A.

[0041] (2) Dissolve 6 g of tetrakis(4-carboxyphenyl) porphine in 6 L of dimethylformamide / ethanol (volume ratio 3 / 1) mixed solvent to obtain solution B.

[0042] (3) Solution A and solution B were mixed, sonicated for 30 min, followed by solvothermal reaction at 80° C. for 12 h. The product was centrifuged and washed three times with ethanol to obtain two-dimensional temperature-sensitive metal-organic framework nanosheets modified with polymers on the surface.

[0043] (4) A thin film was prepared on a nylon-based membrane (purchase...

Embodiment 3

[0047] (1) 40g zinc acetate, 8g pyrazine, and 200g polyisopropylacrylamide / polyvinyl caprolactam (mass ratio 1 / 4, polyisopropylacrylamide molecular weight 8000-12000, prepared by free radical polymerization, single Polyvinyl caprolactam molecular weight 2000-3000, obtained by free radical polymerization of vinyl caprolactam, raw materials purchased from Aladdin company) mixed in 72L dimethylformamide / ethanol (volume ratio 3 / 1) dissolved in a solvent to obtain solution A.

[0048] (2) 25 g of tetrakis(4-carboxyphenyl) porphin was dissolved in 30 L of dimethylformamide / ethanol (volume ratio 3 / 1) mixed solvent to obtain solution B.

[0049] (3) Solution A and solution B were mixed, sonicated for 30 min, followed by solvothermal reaction at 80° C. for 15 h. The product was centrifuged and washed three times with ethanol to obtain two-dimensional temperature-sensitive metal-organic framework nanosheets modified with polymers on the surface.

[0050] (4) A thin film was prepared o...

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Abstract

The invention relates to a preparation method of a two-dimensional temperature-sensitive metal organic framework nanosheet-based filter membrane. The preparation method comprises the following steps:firstly, inhibiting the growth of metal organic framework nanoparticles in the Z-axis direction by utilizing the interaction of a polymer and the metal organic framework nanoparticles, and modifying the surfaces of the metal organic framework nanoparticles to obtain two-dimensional temperature-sensitive metal organic framework nanosheets; preparing a film, and carrying out surface polymerization.The novel filter membrane has the intelligent property that the flux is variable along with the temperature and the salt concentration. Meanwhile, due to the high specific surface area and high porosity of the two-dimensional metal organic framework nanosheet and the modification effect of the surface polymerization layer, the novel membrane has excellent separation performance of high flux and high interception. The method disclosed by the invention is simple and convenient to operate, environment-friendly and easy for batch and large-scale production, and has a good industrial production basis and a wide application prospect.

Description

technical field [0001] The invention belongs to the field of membrane preparation, and in particular relates to a preparation method of a two-dimensional temperature-sensitive metal-organic framework nanosheet-based filter membrane. Background technique [0002] Pressure-driven membrane technology is the most widely used type of membrane process. Its increasingly wide application in water treatment and other fields has put forward higher and higher requirements for the separation performance of the filtration membrane such as flux and rejection rate. However, the flux and rejection performance of traditional polymer-based membranes often have an "exchange" effect, that is, the improvement of a certain performance comes at the expense of another performance. This "exchange" effect largely limits the development of high-performance membranes. In addition, with the development of society and the extension of application scenarios, pressure-driven membranes have also begun to ...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D69/12B01D71/02B01D71/06B01D71/10B01D71/48B01D71/68
Inventor 武培怡贾炜
Owner DONGHUA UNIV
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