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Dopamine based UiO-66 membrane modifying method

A uio-66, dopamine technology, applied in separation methods, chemical instruments and methods, membrane technology, etc., to achieve the effect of expanding the scope of application, excellent selectivity and flux, and increasing selectivity and flux

Inactive Publication Date: 2019-07-26
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But so far, although the flux of UiO-66 membrane can be greater than 1000GPU, while CO 2 / N 2 The selectivity is usually less than 30

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A modification method based on dopamine UiO-66 film, preparation of PDA / UiO-66 film

[0037] The steps and process conditions thereof are as follows:

[0038] Step 1: UiO-66 film preparation

[0039] (1) Preparation of precursor solution

[0040] Dissolve 0.42g of zirconium chloride and 0.30g of terephthalic acid in 67.5mL of N,N-dimethylformamide (DMF), add 32μL of deionized water, and use stirring and ultrasonic to fully dissolve the reagents, and the clarified The precursor solution is transferred to the hydrothermal kettle;

[0041] (2) heat treatment

[0042]Immerse the anodized aluminum porous substrate vertically in the prepared precursor solution with a fixed frame, heat-treat it at a constant temperature of 120°C for 72 hours, and cool it naturally after the heat treatment is completed;

[0043] (3) Ultrasonic treatment

[0044] Take out the membrane and ultrasonically treat it for 5s to remove the UiO-66 particles with poor binding force and obtain the su...

Embodiment 2

[0056] A modification method and steps based on dopamine UiO-66 film are basically the same as in Example 1, the difference from Example 1 is:

[0057] Porous substrate used in step one (2) heat treatment can be polyvinylidene fluoride (PVDF) or polystyrene (PS) or polyacrylonitrile (PAN) respectively; From an economic point of view, the preferred polymer is the hollow fiber membrane of PVDF; The fixed frame is vertically immersed in the prepared precursor solution, heat-treated at a constant temperature of 120°C for 72 hours, and cooled naturally after the heat treatment is completed; (3) The ultrasonic treatment time of ultrasonic treatment is 7s;

[0058] Step 2 (1) soaking dopamine solution concentration for the first time is 6.54mmol / L, soaking time for the first time is 6h; (2) second time soaking dopamine solution concentration in polydopamine (PDA) graft polymerization is 6.54mmol / L and 10mmol / L The mixed solution of Tris-Hcl buffer solution was soaked for 6 hours; aft...

Embodiment 3

[0060] A modification method and steps based on dopamine UiO-66 film are basically the same as in Example 1, the difference from Example 1 is:

[0061] Step 2 (1) The soaking time of dopamine for the first time and the second time is 6 hours respectively;

[0062] The prepared PDA / UiO-66 film has excellent continuity. Test the membrane for CO 2 , N 2 and CH 4 The fluxes were 4.8×10 -7 mol m -2 the s -1 Pa -1 , 1.2×10 -8 mol m -2 the s -1 Pa -1 and 2.1×10 -8 mol m -2 the s -1 Pa -1 . Corresponding to its CO 2 / N 2 and CO 2 / CH 4 The ideal selectivities are 40 and 23.4, respectively. CO of unmodified UiO-66 film 2 , N 2 and CH 4 The fluxes were 5.8×10 -7 mol m -2 the s -1 Pa -1 , 2.2×10 -8 mol m -2 the s -1 Pa -1 and 3.4×10 -8 mol m -2 the s -1 Pa -1 . Corresponding to its CO 2 / N 2 and CO 2 / CH 4 The ideal selectivities are 26.5 and 17, respectively. Compared with the unmodified membrane, the PDA / UiO-66 membrane maintained a higher CO 2...

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PUM

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Abstract

The invention discloses a dopamine based UiO-66 membrane modifying method. The method includes: immersing a fixing frame for a porous substrate in a precursor solution configured by dissolving zirconium chloride and p-phthalic acid in N,N-dimethylamino-amine, and performing thermal treatment for 48-96 hours at the constant temperature; performing ultrasonic treatment for 3-30 seconds to obtain a substrate with seed crystal; performing thermal treatment for at least twice on the substrate deposited with the seed crystal till a continuous UiO-66 membrane is obtained; immersing the obtained membrane for twice to obtain a polydopamine grafted UiO-66 membrane, wherein the concentration of dopamine solutions for twice immersion is the same, the optical selection is in the range of 6.54-26.1mmol / L, and the immersing time is optimized in the range of 6-12 hours. The modifying method is simple, efficiency and easy to operate, and the modified UiO-66 membrane is greatly improved in selectivity and flux; the method has the advantages of environmental friendliness, energy conservation and the like in the production of MOF (metal-organic framework) membranes and application of gas separation membranes, and high prospect of industrial application in the trapping application of CO2 is achieved.

Description

technical field [0001] The invention relates to a method for modifying MOF membranes, in particular to a method for improving UiO-66 membrane CO by modification with dopamine. 2 A Modification Method Based on Dopamine UiO-66 Membrane for Trap Performance. Background technique [0002] In recent years, in the field of porous materials, metal-organic framework (MOF) materials are very popular. The functional modification of UiO-66 groups and the reasonable selection of polymers have been extensively studied by researchers. As one of the MOF materials with outstanding physical and chemical stability, the development of composite membranes based on UiO-66 with superior performance will be a new direction for industrial gas separation in the future. Polymers are the earliest developed and most widely used membrane materials. However, polymer membranes have a separation upper limit on flux and selectivity in gas separation, that is, the greater the flux of the membrane, the low...

Claims

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Application Information

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IPC IPC(8): B01D71/62B01D67/00B01D53/22
CPCB01D53/228B01D67/0079B01D71/62B01D2257/504
Inventor 李万斌吴武凤李战军
Owner JINAN UNIVERSITY
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