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Preparation method of cellulose flat nanofiltration membrane with stable structure

A technology with stable structure and regenerated cellulose membrane, applied in chemical instruments and methods, membranes, membrane technology, etc., can solve the problems of short service life and reduced separation performance of nanofiltration membranes, and achieve reduced production costs, good retention rate, Water flux and strong effect

Active Publication Date: 2020-08-25
FUJIAN AGRI & FORESTRY UNIV
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  • Application Information

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Problems solved by technology

However, since there is no stable chemical bond established between the active layer and the support layer, only relying on the physical effect of mutual adhesion, in long-term use, the support layer and the active layer are separated from each other, resulting in a decrease in the separation performance of the nanofiltration membrane, which needs to be regularly checked. Replace with new separation membrane, the service life is shorter

Method used

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  • Preparation method of cellulose flat nanofiltration membrane with stable structure
  • Preparation method of cellulose flat nanofiltration membrane with stable structure
  • Preparation method of cellulose flat nanofiltration membrane with stable structure

Examples

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Embodiment

[0026] 1) The bamboo pulp is pulverized and dissolved in 80wt% NMMO aqueous solution, and 3 wt‰ n-propyl gallate is added, and the reaction is stirred at 100 ℃ for 3 hours, then the heating is stopped, and the stirrer is turned off after the temperature drops to 90 ℃. Vacuum or let stand for 3 hours to defoam to obtain 6 wt% cellulose casting liquid. Pour the obtained cellulose casting liquid on a glass plate, scrape it with a coater to form a film, and then quickly immerse it in deionized water. Membrane, produced regenerated cellulose membrane (RCM);

[0027] 2) Prepare a 2 g / L dopamine solution with Tris-HCl buffer (50 mM, pH=7-9), then cut the resulting regenerated cellulose membrane into a circular sheet with a diameter of 5 cm and place it in the resulting In the dopamine solution, vibrate at a constant temperature for 4 hours to cause the dopamine to undergo self-polymerization, and then fully wash with deionized water to obtain a surface-modified regenerated cellulose mem...

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Abstract

The invention discloses a preparation method of a cellulose flat nanofiltration membrane with a stable structure. According to the preparation method, a regenerated cellulose membrane, taken as a supporting layer is soaked in a dopamine solution for surface modification, and the regenerated cellulose membrane subjected to surface modification is sequentially put into a piperazine aqueous solutionand an n-hexane solution of trimesoyl chloride for reaction, so that a polyamide active layer is formed on the surface of the membrane. With the use of dopamine, the interaction force between the basemembrane and the polyamide active layer is increased, such that a support layer and the active layer are tightly combined, and the prepared nanofiltration membrane has good stability.

Description

Technical field [0001] The invention belongs to the field of natural polymer materials, and specifically relates to a method for preparing a cellulose flat nanofiltration membrane with a stable structure. Background technique [0002] Separation membranes play a very important role in membrane technology. They can separate and treat organics, microorganisms, and metal ions in wastewater to achieve the effect of water purification. Among them, the membrane pores of the separation membrane are controlled by its preparation process, and can be divided into microfiltration, ultrafiltration, and nanofiltration according to the characteristics of the pore size of the membrane. The substances filtered by different pore sizes are also different, and based on this, they are also used in different fields. The molecular weight cut-off of nanofiltration membrane is between 200~1000Da, and its pore size range is 1~10nm, which can be effectively used to remove heavy metals, reduce total dissol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/00B01D69/06B01D67/00
CPCB01D61/027B01D69/06B01D67/0006B01D2325/36
Inventor 汪东黄六莲林珊张慧曹石林马晓娟陈礼辉倪永浩李建国苗庆显
Owner FUJIAN AGRI & FORESTRY UNIV
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