Post-treatment modification method of polyamide composite nanofiltration membrane

A technology of composite nanofiltration membrane and polyamide, which is applied in the field of membrane separation to achieve the effects of less toxic and side effects, significant membrane performance, and improved permeability selectivity

Pending Publication Date: 2021-06-25
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, how to overcome the disadvantages of traditional membrane material modification methods and overcome the contradiction between the improvement of water flux and the reduction of solute rej...

Method used

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  • Post-treatment modification method of polyamide composite nanofiltration membrane
  • Post-treatment modification method of polyamide composite nanofiltration membrane
  • Post-treatment modification method of polyamide composite nanofiltration membrane

Examples

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Embodiment 1

[0033] This example takes the polyamide composite nanofiltration membrane prepared by the interfacial polymerization method as an example to illustrate the steps of the post-treatment modification method and the beneficial effects brought about.

[0034] 1. Prepare polyamide composite nanofiltration membrane by interfacial polymerization method: select polysulfone ultrafiltration membrane with a molecular weight cut-off of 100,000 Daltons as the base membrane, and use ultrapure water as the aqueous phase solvent to prepare a concentration of 0.8% (w / v) Piperazine aqueous phase solution, using n-hexane as the organic phase solvent to prepare 0.1% (w / v) trimesoyl chloride organic phase solution. First pour the piperazine aqueous phase solution on the base film, soak for 5 minutes, pour off the piperazine aqueous phase solution, remove the residual water droplets on the surface of the film with a scraper, then pour the trimesoyl chloride organic phase solution, react for 20s, and ...

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Abstract

The invention discloses a post-treatment modification method of a polyamide composite nanofiltration membrane. The method comprises the following steps: carrying out post-treatment modification on a new nanofiltration membrane by using an alkaline alcohol solution, and dissolving and removing residual macromolecular chains in a polyamide active layer of the nanofiltration membrane by exerting a synergistic effect between an alkaline substance and an alcohol solvent, so that the polyamide active layer is etched and thinned, and the core functional layer which can play a solute interception role is reserved, so that the interception performance of the nanofiltration membrane is guaranteed, the mass transfer resistance of the nanofiltration membrane is greatly reduced, the water molecule permeability of the nanofiltration membrane is improved, the pure water flux is obviously improved, and the improvement amplitude can reach 100%. The post-treatment modification mode provided by the invention is low in cost and easy to operate, the treatment effect is superior to that of other traditional modification methods, and the method is expected to play an important role in performance improvement of the polyamide composite nanofiltration membrane.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and relates to a simple and effective nanofiltration membrane modification method capable of realizing synchronous regulation and optimization of multiple membrane structures and membrane performance parameters. Background technique [0002] With the rapid development of social economy, the shortage of global water resources has become increasingly prominent, and with the increasingly serious problem of water pollution, the problem of water resources has become a major challenge to the development of the national economy. Due to its excellent permeability and selectivity, polyamide composite nanofiltration membranes are widely used in water treatment fields such as seawater desalination, drinking water purification, brackish water desalination, industrial wastewater treatment, sewage and wastewater recycling, as well as food processing, biochemistry and Other industrial industries suc...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D69/12B01D71/56B01D61/02
CPCB01D67/0093B01D69/125B01D71/56B01D61/027
Inventor 张瑞君苏松田家宇高珊珊肖峰
Owner HEBEI UNIV OF TECH
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