Preparation method of aromatic polyamide film modified by ZIF-8 type metal-organic framework material

A technology of ZIF-8 and filled polyamide membrane, which is applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of high cross-linking degree, low free volume, low water flux, etc., and achieve high Effects of selectivity, improved separation performance, and simple membrane production process

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

AI Technical Summary

Problems solved by technology

Aromatic polyamides have a high degree of cross-linking and low free volume; the preparat

Method used

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  • Preparation method of aromatic polyamide film modified by ZIF-8 type metal-organic framework material
  • Preparation method of aromatic polyamide film modified by ZIF-8 type metal-organic framework material
  • Preparation method of aromatic polyamide film modified by ZIF-8 type metal-organic framework material

Examples

Experimental program
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preparation example Construction

[0032] The invention provides a ZIF-8 filled polyamide membrane used for separating aqueous solution by nanofiltration or reverse osmosis and a preparation method thereof. First, nano-scale ZIF-8 particles are synthesized, and then a dense skin layer (ZIF-8 filled polyamide film) is prepared on the base film, and the composite film is obtained after post-treatment.

[0033] synthesis : 1.0 g Zn(NO 3 ) 2 ·6H 2 O was dissolved in 20 mL of methanol and 10 ml of water to make Zn(NO 3 ) 2 ·6H 2 O solution, 3.0 g 2-methylimidazole was dissolved in 20 mL methanol to form a 2-methylimidazole solution; Zn(NO 3 ) 2 ·6H 2 O was dissolved in 2-methylimidazole solution and stirred for 10 min, and then reacted at room temperature for 12 h to obtain a white ZIF-8 dispersion. The resulting ZIF-8 particles were collected by high-speed centrifugation, soaked in distilled water and methanol overnight and then centrifuged to obtain pure ZIF-8, and vacuum-dried to obtain powdered ZIF-8 wi...

Embodiment 1~4

[0045] ZIF-8 Aqueous Phase Added Membrane : Weigh an appropriate amount of ZIF-8 to prepare MPD aqueous solution with ZIF-8 addition amount of 0.05~0.2% (w / v), and ultrasonically disperse evenly for interfacial polymerization to prepare ZIF-8 aqueous phase additive film. Other membrane preparation steps are the same as the comparative example. The separation performance is shown in Table 1. The permeation flux increases with the increase of ZIF-8 content, while the retention rate increases first and then decreases; when the addition of ZIF-8 is 0.05~0.15% (w / v), the flux and retention rate can be achieved at the same time. improve.

[0046] Table 1 Separation performance of ZIF-8 aqueous phase addition membrane

[0047]

Embodiment 5~8

[0049] ZIF-8 organic phase added film: Weigh an appropriate amount of TMC n-hexane solution with 0.05-0.2% (w / v) addition of ZIF-8, and ultrasonically disperse it uniformly for interfacial polymerization to prepare ZIF-8 organic phase additive film. The synthesis of ZIF-8 is the same as the above example, and other membrane preparation steps are the same as the comparative example. The separation performance is shown in Table 2. The permeation flux increases with the increase of ZIF-8 content, while the retention rate increases first and then decreases; when the addition of ZIF-8 is 0.05~0.15% (w / v), the flux and retention rate can be achieved at the same time. improve.

[0050] Table 2 Separation performance of ZIF-8 organic phase added membrane

[0051]

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Abstract

The invention discloses a preparation method of an aromatic polyamide film modified by a ZIF-8 type metal-organic framework material. A ZIF-8 filling polyamide composite film is prepared on an ultrafiltration bottom film by an interfacial polymerization method, wherein nano-grade ZIF-8 particles are added into an m-phenylenediamine aqueous solution and/or a trimesoyl hexane solution; a polyamide ultrathin skin layer, to which ZIF-8 is added, is formed through interfacial polymerization. The preparation method has the advantages that by the use of a ZIF-8 nano-grade aperture and a three-dimensional multi-hole structure, the selectivity or the permeability of the aromatic polyamide film is improved; the prepared ZIF-8 filling polyamide composite film can serve as a nanofiltration or reverse osmosis film for removing organic matters from the aqueous solution; when the adding ratio of an organic phase or water phase solution, to which ZIF-8 is added, is 0.05-0.15% (w/v), the performance of the film is the highest, and the permeation flux and the retention rate can be increased at the same time; furthermore, the nanofiltration or reverse osmosis performance of the two-phase adding film is higher than that of a single-phase adding film.

Description

Technical field [0001] The present invention involves preparing a ZIF-8 metal-organic skeleton material modified aromatic polyamide filter membrane to achieve high selectivity or high-throughput separation performance.The nanofractive membrane of the present invention uses the nano-grade channel and porous structure of the ZIF-8 to improve the selectivity or water flux of the separation film, which can be used to remove organic matter from the water solution. Background technique [0002] Na filtration and reverse osmosis are the membrane separation process with pressure differences as the driving force. It has the characteristics of no phase change, high selectivity, high efficiency and low energy consumption.The pore diameter of the nanoferous membrane is a few nanosome. The two -price ions are cut but allowed to pass through the unit price ion. The interception molecular weight is within the range of 100–1000 da, and the operating pressure is low.Below the natal filter membran...

Claims

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Application Information

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IPC IPC(8): B01D71/56B01D69/12B01D69/02B01D67/00
Inventor 王璐莹雷建都何静邓立红刘静
Owner BEIJING FORESTRY UNIVERSITY
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