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UiO-66 doped multifunctional layer composite nanofiltration membrane and method for preparing UiO-66 doped multifunctional layer composite nanofiltration membrane

A uio-66, multi-functional technology, applied in the field of membrane separation, can solve the problems of reduced composite membrane retention rate, long time-consuming composite membrane, low production efficiency, etc., to improve flux and retention rate, improve membrane flux, phase Good capacitive effect

Active Publication Date: 2022-07-22
XIAN UNIV OF SCI & TECH
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Problems solved by technology

However, the application of layer-by-layer self-assembly method to prepare composite films takes a long time, the production efficiency is low, and it is easy to cause cross-contamination during repeated deposition processes. At the same time, relying on electrostatic interaction and hydrogen bond interaction is less stable than covalent bond film formation. It is easy to swell in a strong polar solvent, resulting in a decrease in the rejection rate of the composite membrane

Method used

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  • UiO-66 doped multifunctional layer composite nanofiltration membrane and method for preparing UiO-66 doped multifunctional layer composite nanofiltration membrane

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Experimental program
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Effect test

preparation example Construction

[0039] The preparation method of UiO-66 is:

[0040] Add 30-60mL N,N-dimethylformamide (DMF), 8-12mL concentrated hydrochloric acid and 1-1.5g zirconium chloride to the flask, and ultrasonically treat for 20-30min to obtain solution A; Phthalic acid and 80-120 00mL DMF were mixed into solution A for sonication for 20-30min, then heated in a water bath at 70-100°C for 6-12h, filtered and dried to obtain UiO-66 solid powder.

[0041] Step 2, mix the surface of the membrane covered with a cationic polyelectrolyte monolayer with a concentration of 0.5-2.5 g / L and an anionic polyelectrolyte (polyacrylic acid, sodium poly-4-styrene sulfonate or sodium alginate with a concentration of 0.5-2.5 g / L); ) solution was contacted for 10-30 min, then rinsed with deionized water for 2 min, and then drained the membrane surface liquid to obtain a membrane covered with an anionic-cationic polyelectrolyte double layer.

[0042] Step 3: Repeat steps 1 and 1 to 3 times on the membrane covered wit...

Embodiment 1

[0047] (1) A polyvinylamine (PVAm, concentration 0.5g / L) solution containing 5wt% UiO-66 was prepared.

[0048] First, 50 mL of N,N-dimethylformamide (DMF), 10 mL of concentrated hydrochloric acid and 1.25 g of zirconium chloride were added to the flask, and ultrasonically treated for 20 min to obtain solution A; then 1 mL of terephthalic acid and 100 mL of DMF were mixed into the solution Ultrasonic treatment in A for 20 min, then heated in a water bath at 80 °C for 8 h, filtered and dried to obtain UiO-66 solid powder.

[0049] Then, the UiO-66 solid powder was mixed with 5wt% polyvinylamine solution, and then the mixed solution was ultrasonically treated for 1 h to obtain a PVAm solution mixed with UiO-66, which was denoted as UiO-66 / non-space PVAm solution.

[0050] Using the polysulfone ultrafiltration membrane as the base membrane, the surface of the base membrane was contacted with the UiO-66 / PVAm solution for 30 minutes, and then the membrane surface was rinsed with de...

Embodiment 2

[0056] (1) A polyethyleneimine (PEI, concentration 1.5g / L) solution containing 8wt% UiO-66 was prepared.

[0057] First, 60 mL of N,N-dimethylformamide (DMF), 8 mL of concentrated hydrochloric acid and 1 g of zirconium chloride were added to the flask, and ultrasonically treated for 30 min to obtain solution A; then 2 mL of terephthalic acid and 80 mL of DMF were mixed into solution A Ultrasonic treatment was carried out for 25 min, then heated in a water bath at 70 °C for 12 h, filtered and dried to obtain UiO-66 solid powder.

[0058] Then, the UiO-66 solid powder was mixed with 8wt% polyethyleneimine solution, and then the mixed solution was ultrasonically treated for 1 h to obtain a PEI solution mixed with UiO-66, which was denoted as UiO-66 / PEI solution.

[0059] The ultrafiltration membrane obtained after the hydrolysis modification of the polyacrylonitrile membrane was used as the base membrane, and the surface of the base membrane was contacted with the UiO-66 / PEI solu...

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Abstract

The invention discloses a method for preparing a UiO-66 doped multifunctional layer composite nanofiltration membrane, and the method comprises the following steps: respectively contacting the surface of a base membrane with a cationic polyelectrolyte solution and an anionic polyelectrolyte solution which are mixed with UiO-66, and repeating the steps for a plurality of times until a multi-layer UiO-66 + polyelectrolyte composite membrane is obtained. And respectively contacting the surface of the multi-layer UiO-66 + polyelectrolyte composite membrane with a m-phenylenediamine aqueous phase solution and a trimesoyl chloride organic phase solution to obtain the multi-layer UiO-66 + polyelectrolyte-polyamide composite membrane. And carrying out heat treatment to obtain the UiO-66 doped multifunctional layer composite nanofiltration membrane. The composite nanofiltration membrane provided by the invention improves the membrane preparation efficiency and the membrane stability, and has the comprehensive properties of high flux, high retention rate, good pollution resistance, good organic compatibility, adjustable pore size and height, and easy realization of functional group modification.

Description

technical field [0001] The invention relates to a layer-by-layer self-assembly-interface polymerization method for preparing a UiO-66-doped multifunctional layer composite nanofiltration membrane and a method, and belongs to the technical field of membrane separation. Background technique [0002] Nanofiltration (NF) membrane is a separation membrane with a pore size of less than 2 nm. Its advantages are that it not only has a good interception effect on small molecular organics and inorganic salts, but also can selectively separate ions of different valences. The traditional preparation techniques of nanofiltration membranes mainly include phase inversion method, blending method, surface charging method and composite method. The composite method is currently the most used and most effective method for preparing nanofiltration membranes, and it is the method with the largest variety and largest yield of commercial nanofiltration membranes. The composite method includes the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/02B01D69/12B01D71/06
CPCB01D67/0006B01D67/0002B01D69/02B01D69/125B01D71/06B01D61/027Y02A20/131
Inventor 王佳璇孙沛东刘喆王娜路程
Owner XIAN UNIV OF SCI & TECH
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