High-flux polyamide/ZIF-8 nanofiltration composite film and preparation method thereof

A ZIF-8 and polyamide nanotechnology, which is applied in the field of interfacial polymerization to prepare polyamide/ZIF-8 nanofiltration membranes, can solve problems such as defects, MOFs agglomeration interface, and affecting membrane separation performance, so as to improve membrane performance and make membranes The process is simple and feasible, and the effect of excellent selectivity

Inactive Publication Date: 2014-12-17
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of PA / MOFs nanofiltration membranes by this kind of filling and blending method requires the synthesis of MOFs materials before membrane formation, and the filling amount of MOFs is affected by its dispersion in the membrane-making liquid. separation performance

Method used

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  • High-flux polyamide/ZIF-8 nanofiltration composite film and preparation method thereof

Examples

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Effect test

preparation example Construction

[0023] The invention provides a novel PA / ZIF-8 membrane used for separating aqueous solution by nanofiltration and a preparation method thereof. First, ZIF-8 particles are grown on the surface of the ultrafiltration bottom membrane by an in-situ growth method, and then a PA / ZIF-8 dense skin layer is prepared by an interface polymerization method, and the composite membrane is obtained through post-processing.

[0024] The prepared PA / ZIF-8 nanofiltration membrane uses a flat-panel membrane performance evaluation device to evaluate the separation performance of the separated aqueous solution system, that is, the permeation flux and rejection rate of the membrane.

[0025] 1) Osmotic flux ( J ), the permeability of the reaction membrane is defined as:

[0026] J = M / ( A · t ) or J = V / ( A · t )

[0027] In the formula, M and V respectively is the mass (kg) and volume (m) of permeate permeated through the membrane 3 ); A is the membrane area, m 2 ; t is the ...

Embodiment 1~4

[0032] 5.0 g Zn(NO 3 ) 2 ·6H 2 O was dissolved in a mixture of 100 mL methanol and 50 ml water to make Zn(NO 3 ) 2 ·6H 2 O solution, 15.0 g 2-methylimidazole was dissolved in 100 mL methanol to form a 2-methylimidazole solution; Zn(NO 3 ) 2 ·6H 2 The O solution was quickly poured into the 2-methylimidazole solution and stirred for 10 min to obtain a white ZIF-8 dispersion. The polyethersulfone ultrafiltration bottom membrane (30,000 Dal molecular weight cut-off) was immersed in the dispersion solution and allowed to stand at room temperature for 12 hours to allow ZIF-8 particles to grow on the bottom membrane surface. The bottom membrane was taken out, washed repeatedly with distilled water and methanol, and dried at 60 °C for 2 h to obtain the bottom membrane of a single growth of ZIF-8. Repeat the above ZIF-8 growth process to prepare the bottom membrane of ZIF-8 grown multiple times.

[0033] A flat-panel membrane performance evaluation device was used to evaluate ...

Embodiment 5-8

[0036]At room temperature, the TMC monomer was dissolved in n-hexane to prepare a 0.1% (w / v) organic phase solution, and the MPD monomer was dissolved in ultrapure water to prepare a 2% (w / v) aqueous phase solution. The ultrafiltration bottom membranes of Comparative Example 1 and Examples 1 to 4 were respectively selected and immersed in the MPD aqueous phase solution for 2 min, and the bottom membrane in the aqueous phase solution was removed to remove the excess water phase on the surface of the membrane; then the bottom membrane was placed on the The interfacial polymerization reaction occurred in the TMC organic phase solution for 20 s, took it out to dry in air, and heat-treated at 60 °C for 2 min, and finally washed repeatedly with deionized water to obtain the nanofiltration membrane.

[0037] The separation performance of the nanofiltration membrane separation aqueous solution system was measured by a flat-plate membrane performance evaluation device: the feed liquid w...

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Abstract

The invention discloses a preparation method of a high-flux polyamide / ZIF-8 nanofiltration composite film. The preparation method comprises the following steps of (1) growing a ZIF-8 type metal-organic framework material on an ultrafiltration bottom film in situ; (2) preparing a polyamide skin layer on the bottom film with ZIF-8 particles through interfacial polymerization; and (3) post-treating a primary composite film to obtain the polyamide / ZIF-8 nanofiltration composite film. A dense skin layer of the nanofiltration film consists of ZIF-8 and polyamide; by virtue of single or multiple in-situ growth, the ZIF-8 particles grow on the surface of the bottom film, and the polyamide skin layer is formed through interfacial polymerization, and the ZIF-8 particles on the surface of the bottom film are embedded into the polyamide layer. By use of a ZIF-8 multi-hole structure and a nano-grade channel size, the nanofiltration separation performance of the polyamide film of the prepared polyamide / ZIF-8 nanofiltration composite film can be improved. On the basis of the in-situ growth method, the operation of firstly synthesizing ZIF-8 and then adding into film preparation liquid is eliminated, so that the film preparation technology is simple; the performance of the polyamide / ZIF-8 film prepared by in-situ growth for multiple times is high; when the nanofiltration composite film is used for separating an inorganic salt aqueous solution system, the permeation flux can be increased; when the nanofiltration composite film is used for separating a congo red aqueous solution, the permeation flux and the retention rate can be increased at the same time.

Description

technical field [0001] The invention relates to the preparation of a novel polyamide / ZIF-8 type metal-organic framework material nanofiltration composite membrane: pre-grow ZIF-8 in situ on the surface of the ultrafiltration bottom membrane, and then prepare polyamide / ZIF-8 by interfacial polymerization Nanofiltration. This method can introduce ZIF-8 material into the polyamide skin layer, increase the pores in the skin layer to improve the permeability of the membrane; growing ZIF-8 in advance can improve the dispersion of ZIF-8 in polyamide, thereby reducing interface defects to improve membrane permeability. selectivity. Background technique [0002] The membrane separation process is a process in which the mixed components of raw materials selectively pass through the separation membrane under the action of the driving force to achieve separation. Nanofiltration is a membrane separation process driven by pressure difference. It has the characteristics of allowing small...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D69/12B01D67/00
Inventor 王璐莹雷建都何静刘静邓立红
Owner BEIJING FORESTRY UNIVERSITY
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