Polymer composite membrane for in-situ growth of MOF (Metal Organic Framework) middle layer in low-temperature water phase as well as preparation and application

A polymer and intermediate layer technology, applied in the field of membrane separation, can solve problems such as organic solvent environmental pollution, affecting the performance of selective layer composite membranes, etc., to achieve the effects of promoting absorption, improving surface morphology and properties, and enhancing binding force

Active Publication Date: 2022-05-20
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

Although this method can avoid hydrothermal or solvothermal methods to introduce the intermediate layer, its preparation process involves organic solvents. On the one hand, organic solvents will swell the polymer base film, which will affect the preparation of the subsequent selection layer and the performance of the composite film. On the other hand, organic solvents will pollute the environment

Method used

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  • Polymer composite membrane for in-situ growth of MOF (Metal Organic Framework) middle layer in low-temperature water phase as well as preparation and application
  • Polymer composite membrane for in-situ growth of MOF (Metal Organic Framework) middle layer in low-temperature water phase as well as preparation and application
  • Polymer composite membrane for in-situ growth of MOF (Metal Organic Framework) middle layer in low-temperature water phase as well as preparation and application

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preparation example Construction

[0035] The invention provides a polymer composite membrane with a low-temperature water-phase in-situ growth MOF intermediate layer and its preparation method and application, mainly comprising the following steps:

[0036] (1) MOF intermediate layer grown on the surface of the polymer support layer

[0037] Put the polymer support layer in 1.0-2.0M NaOH solution for alkali treatment for 15-60 minutes, then soak in deionized water to remove the adsorbed alkali solution; then soak the alkali-treated polymer support layer in the water phase MOF growth After growing in the solution for 0.5-12 hours at 20-60°C, take it out, wash away the residual solution adsorbed on the surface and inside of the support layer with deionized water, and obtain a polymer support layer with an MOF intermediate layer after drying;

[0038] (2) Preparation of chitosan composite membrane with MOF intermediate layer

[0039] The polymer support layer with the MOF intermediate layer prepared in step (1) ...

Embodiment 1

[0060] Embodiment 1 is a polymer composite membrane based on chitosan, and the support layer of the composite membrane is a polyacrylonitrile hollow fiber membrane. The preparation process of the composite membrane includes the following steps :

[0061] (1) Prepare an aqueous NaOH solution with a molar concentration of 2M, heat it to 50° C., put it into a polyacrylonitrile support layer, and treat it with alkali for 30 minutes.

[0062] (2) Add 1.75 g of zirconium chloride, 10 mL of formic acid and 0.9 g of fumaric acid in sequence to 200 mL of deionized water, stir and dissolve to obtain a MOF growth solution. Heating to 30°C, putting the alkali-treated polyacrylonitrile support layer in, and growing in-situ in the low-temperature water phase for 12 hours, to prepare a hollow fiber support layer with an MOF middle layer.

[0063] (3) Prepare a chitosan-acetic acid-water solution with a mass fraction of 1 / 10 / 89 wt%, and fully stir until completely dissolved. The two ends ...

Embodiment 2

[0065] The experimental operation is the same as in Example 1, except that in step (3), the chitosan reaction time is 3 minutes.

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Abstract

The invention relates to a polymer composite membrane of a low-temperature water-phase in-situ growth MOF (Metal Organic Framework) middle layer as well as preparation and application, and belongs to the technical field of membrane separation. The preparation method comprises the following steps: soaking the polymer support layer in a water-phase MOF growth solution to prepare the MOF middle layer at low temperature, and then performing in-situ polymerization curing on the surface of the MOF middle layer to form the polymer selection layer, thereby obtaining the polymer composite membrane. The MOF is grown through the aqueous solution, the problem that a polymer is not resistant to solvents and high temperature in a conventional preparation method is solved, the growth temperature is low, and the technological process is simple. Meanwhile, the MOF middle layer and the polymer selection layer are connected through electrostatic interaction, and when the composite membrane is applied to dehydration of an organic solvent (ethanol), compared with a polymer composite membrane without the middle layer, the separation performance is obviously improved.

Description

technical field [0001] The invention belongs to the field of membrane separation, and more specifically relates to a polymer composite membrane for in-situ growth of an MOF intermediate layer in a low-temperature water phase, as well as its preparation and application. Background technique [0002] Membrane separation technology has low energy consumption, high efficiency, and convenient operation. It has been widely used in many fields such as petrochemical industry, drug separation, and environmental governance. It has become one of the most popular and important means in industry. The core of membrane separation technology lies in the research and development of separation membranes. An ideal separation membrane needs to have excellent separation performance and mechanical properties. Therefore, the composite membrane composed of a porous support layer and a separation selective layer is favored by researchers. Among them, the porous support layer is mainly used to enhan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D69/10B01D67/00B01D61/00B01D61/02B01D61/36
CPCB01D69/125B01D69/105B01D67/0088B01D61/002B01D61/025B01D61/027B01D61/362Y02A20/131
Inventor 王艳夏庆
Owner HUAZHONG UNIV OF SCI & TECH
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