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Secondary polymerization synchronous self-sealing ZIF-8 modified reverse osmosis membrane and preparation method thereof

A ZIF-8, secondary polymerization technology, applied in reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc., can solve the problem of easy agglomeration of ZIF-8 materials, broken aromatic polyamide layer, limiting reverse osmosis membrane performance and other issues, to achieve good application prospects, simple preparation methods, and high-throughput effects

Active Publication Date: 2022-08-05
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above excellent properties make it possible to effectively improve the water permeability of reverse osmosis membranes. However, the ZIF-8 material directly added to the water phase or oil phase is very easy to agglomerate, which greatly limits its improvement on the performance of reverse osmosis membranes.
In the early stage, the ZIF modified polyamide membrane was prepared by in situ reverse diffusion. Although the agglomeration of ZIF nanoparticles was effectively avoided, it was easy to cause damage to the dense aromatic polyamide layer and affect the salt interception performance of the membrane.

Method used

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  • Secondary polymerization synchronous self-sealing ZIF-8 modified reverse osmosis membrane and preparation method thereof
  • Secondary polymerization synchronous self-sealing ZIF-8 modified reverse osmosis membrane and preparation method thereof
  • Secondary polymerization synchronous self-sealing ZIF-8 modified reverse osmosis membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 2

[0034] Example 1 Synchronous growth of ZIF-8 by secondary polymerization:

[0035] (1) spread the 0.12mol / L hexahydrate zinc nitrate aqueous solution on the polysulfone ultrafiltration support membrane, immerse it for 2min, pour out the solution, and dry the membrane;

[0036] (2) immersing the obtained membrane in a 2wt% m-phenylenediamine aqueous solution, after immersing for 3min, the solution is poured out, and the membrane is air-dried;

[0037] (3) contacting the obtained film with a 0.1 wt% trimesoyl chloride n-hexane solution, and after interfacial polymerization for 60s, the film is placed in a 60°C oven for 10min;

[0038] (4) placing the obtained film in a 75% isopropanol aqueous solution with a mass fraction of 3wt% m-phenylenediamine and 10wt% 2-methylimidazole for 10min, and drying the film;

[0039] (5) The obtained membrane was placed in a 0.2 wt% sodium bicarbonate aqueous solution for cleaning for 2 min, taken out, cleaned with deionized water, dried in the ...

Embodiment 2

[0042] Embodiment 2 changes the concentration of ZIF solution of secondary polymerization synchronous growth:

[0043] (1) spread the 0.12mol / L hexahydrate zinc nitrate aqueous solution on the polysulfone ultrafiltration support membrane, immerse it for 2min, pour out the solution, and dry the membrane;

[0044] (2) immersing the obtained membrane in a 2wt% m-phenylenediamine aqueous solution, after immersing for 3min, the solution is poured out, and the membrane is air-dried;

[0045] (3) contacting the obtained film with a 0.1 wt% trimesoyl chloride n-hexane solution, and after interfacial polymerization for 60s, the film is placed in a 60°C oven for 10min;

[0046] (4) placing the obtained film in a 75% isopropanol aqueous solution with a mass fraction of 5wt% m-phenylenediamine and 10wt% 2-methylimidazole for 10min, and drying the film;

[0047](5) The obtained membrane was placed in a 0.2 wt% sodium bicarbonate aqueous solution for cleaning for 2 min, taken out, cleaned ...

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Abstract

The invention discloses a secondary polymerization synchronous self-sealing ZIF-8 modified reverse osmosis membrane and a preparation method thereof.The reverse osmosis membrane is composed of an ultrafiltration membrane supporting layer, an aromatic polyamide layer, a secondary polymerization aromatic polyamide layer and ZIF-8. The preparation method comprises the steps that the ultrafiltration membrane supporting layer is soaked in a zinc ion solution; secondly, performing interfacial polymerization on the supporting layer to obtain an aromatic polyamide layer coated with metal ions, and then synchronously performing secondary interfacial polymerization and ZIF-8 growth to obtain the ZIF-8 modified reverse osmosis membrane which is synchronously sealed by secondary polymerization. According to the method, the agglomeration phenomenon of the ZIF-8 in a water phase or an oil phase is avoided, so that the ZIF-8 material uniformly grows in polyamide and an ultrafiltration membrane supporting layer, the defects of an aromatic polyamide layer caused by the ZIF-8 are overcome through secondary polymerization, and the prepared reverse osmosis membrane polymer has high flux and relatively high interception performance.

Description

technical field [0001] The invention relates to the technical field of reverse osmosis membranes, in particular to a secondary polymerization synchronous self-sealing ZIF-8 modified reverse osmosis membrane and a preparation method thereof. Background technique [0002] Due to the continuous growth of the world population, the continuous development of industrialization and the uneven distribution of water resources, human beings have an increasing demand for freshwater resources, while the available freshwater resources only account for 0.8% of the global water resources reserves. development and human water security, seeking solutions to the shortage of freshwater resources is a top priority. Freshwater treatment technology based on reverse osmosis (RO) is a key technology for producing freshwater from seawater, and it has gained widespread attention due to its advantages of simple operation and low energy consumption. [0003] Polyamide has good stability and hydrophilic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/02B01D67/00B01D69/12B01D71/34B01D71/42B01D71/56B01D71/68
CPCB01D61/025B01D69/12B01D67/0006B01D71/56B01D71/68B01D71/42B01D71/34Y02A20/131
Inventor 薛立新张祚群白超杰苌现
Owner ZHEJIANG UNIV OF TECH
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