Polyamide/COFs hybridized nanofiltration composite membrane and preparation method thereof

A composite membrane and polyamide technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of low selectivity and low permeability of high-permeability separation membranes, and achieve high water flux and The effect of retention

Active Publication Date: 2016-06-08
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Researchers have been committed to developing high-flux nanofiltration membranes, but the permeability and selectivity of traditional polymer membranes are mutually restricted, and there is a "Robeson" effect, that is, high-selectivity separation membranes usually have low permeability and high permeability. Sexual separation membranes usually have low selectivity

Method used

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  • Polyamide/COFs hybridized nanofiltration composite membrane and preparation method thereof
  • Polyamide/COFs hybridized nanofiltration composite membrane and preparation method thereof
  • Polyamide/COFs hybridized nanofiltration composite membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The porous support layer was prepared by non-solvent-induced phase inversion method: 6.4g polyethersulfone, 6.4g polyethylene glycol (molecular weight 2000) and 27.2g N,N-dimethylformamide were added to a three-necked flask, and the The mixture was stirred for 5 h, and when the stirring time was reached, the mixture was left standing in a water bath at 60° C. for 4 hours to defoam. After degassing, pour the casting solution on a glass plate with a groove depth of 200-400 microns, use a scraper to make a flat liquid film from the casting solution on the glass plate, and then place the obtained liquid film on a gel at room temperature In a water bath (i.e., a water bath), through a phase inversion process, the liquid membrane is solidified into a porous support layer of polyethersulfone sulfone, which is taken out after 2 minutes, and then soaked in deionized water at room temperature for 24 hours to obtain a film with a thickness of 200-400 microns. Polyethersulfone poro...

Embodiment 2-4

[0041] The content of SNW-1 in the water phase was adjusted, and the rest were the same as in Example 1. The performance test results are shown in Table 1.

[0042]

[0043] Example 1-4 is to investigate the influence of the content of SNW-1 in the aqueous phase on the performance of the nanofiltration membrane obtained.

example 5-7

[0045] Embodiment 5-7 is the same as embodiment 3 except that the concentration of polyamine in water phase is adjusted

[0046]

[0047] Examples 8-10 are to investigate the effect of the concentration of trimesoyl chloride in the oil phase medium on the performance of the prepared SNW-1 / PA nanofiltration composite membrane.

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Abstract

The invention provides a polyamide / COFs hybridized nanofiltration composite membrane. The composite membrane comprises a composite layer and a loaded porous frame material. The composite layer is a layer of polyamide compound formed by conducting polymerization reaction on piperazine and trimesoyl chloride, and the thickness is 100-500 nm. The porous frame material is SNW-1 obtained when melamine and terephthalaldehyde react, and is a compound layer with the loading amount of 0.5-3 g / m<2>. A covalent organic framework is effectively hybridized in a separation layer of the composite membrane, and more water channels are provided for the nanofiltration membrane. By means of the method, various types of COFs can be introduced onto a polyether sulfone base membrane, the water flux can reach 200 L / m<2>.h.MPa and increased by 2 times, the sodium sulfate retention rate of the nanofiltration membrane is still kept at 80% or above, and the high water flux and the high retention rate are achieved.

Description

technical field [0001] The invention relates to the technical field of nanofiltration membrane separation, in particular to a preparation method for preparing a hybrid nanofiltration composite membrane containing covalent organic frameworks (COFs). Background technique [0002] Membrane separation technology uses the membrane as the separation medium to realize the separation, fractionation, purification and enrichment of the mixture by using the difference in the selective permeability of the components to be separated and the external pressure or chemical potential difference as the driving force. Compared with traditional separation technology, membrane separation technology has the advantages of simple operation, no phase change in the separation process, low energy consumption, and high efficiency. In recent years, membrane separation, as an environmentally friendly and efficient separation technology, has been widely used in the fields of pharmaceutical purification, m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/40B01D69/12B01D61/00B01D67/00
CPCB01D61/027B01D67/0002B01D69/12B01D71/40
Inventor 陈建新李志远王重斌李银辉苏敏卢爱党韩健
Owner HEBEI UNIV OF TECH
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