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Cellulose gel layer modified loose nanofiltration membrane for high-flux dye separation as well as preparation method and application of cellulose gel layer modified loose nanofiltration membrane

A technology of cellulose gel and nanofiltration membrane, which is applied in the direction of semipermeable membrane separation, chemical instruments and methods, membranes, etc., can solve the problems of reduced separation performance of loose nanofiltration membranes, and achieve excellent hydrophilicity and antifouling properties , Simple operation, easy to control the effect

Active Publication Date: 2021-12-17
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical applications, the membrane fouling caused by the feed liquid will reduce the separation performance of the loose nanofiltration membrane. Long-term separation of salt has become a widespread concern

Method used

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  • Cellulose gel layer modified loose nanofiltration membrane for high-flux dye separation as well as preparation method and application of cellulose gel layer modified loose nanofiltration membrane
  • Cellulose gel layer modified loose nanofiltration membrane for high-flux dye separation as well as preparation method and application of cellulose gel layer modified loose nanofiltration membrane
  • Cellulose gel layer modified loose nanofiltration membrane for high-flux dye separation as well as preparation method and application of cellulose gel layer modified loose nanofiltration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Example 1: Preparation of a loose nanofiltration membrane for high-throughput dye separation modified by a cellulose gel layer.

[0045] Specific steps are as follows:

[0046] 1) Preparation of ultrafiltration membrane base membrane: add dry polyvinylidene fluoride PVDF, PEG, LiCl and NMP into a three-necked flask in sequence, and mechanically stir for 10 hours at 65°C to obtain a uniform casting solution. After defoaming, use a film scraper to scrape the uniform casting solution on the glass plate, soak the glass plate in the coagulation solution, and prepare the polyvinylidene fluoride PVDF film (M-Pure) by the NIPS phase inversion method, that is Ultrafiltration membrane base membrane;

[0047] 2) dopamine and cellulose co-deposition modified ultrafiltration membrane base membrane: soak the PVDF membrane obtained in step 1) in 30mL Tris buffer containing 1g / L carboxymethylcellulose CMC and 1g / L dopamine DA, Shake in a shaker at a constant speed for 2 hours to carr...

Embodiment 2

[0051] Example 2: Preparation of a loose nanofiltration membrane for high-throughput dye separation modified by a cellulose gel layer.

[0052] Specific steps are as follows:

[0053] 1) Preparation of ultrafiltration membrane base membrane: add dry polyvinylidene fluoride PVDF, PEG, LiCl and NMP into a three-necked flask in sequence, and mechanically stir for 10 hours at 65°C to obtain a uniform casting solution. After defoaming, use a film scraper to scrape the uniform casting solution on the glass plate, soak the glass plate in the coagulation solution, and prepare the polyvinylidene fluoride PVDF film (M-Pure) by the NIPS phase inversion method, that is Ultrafiltration membrane base membrane;

[0054] 2) dopamine and cellulose co-deposition modified ultrafiltration membrane base membrane: soak the PVDF membrane obtained in step 1) in 30mL Tris buffer containing 1g / L carboxymethylcellulose CMC and 1g / L dopamine DA, Shake in a shaker at a constant speed for 2 hours to carr...

Embodiment 3

[0058] Example 3: Preparation of a loose nanofiltration membrane for high-throughput dye separation modified by a cellulose gel layer.

[0059] Specific steps are as follows:

[0060] 1) Preparation of ultrafiltration membrane base membrane: add dry polyvinylidene fluoride PVDF, PEG, LiCl and NMP into a three-necked flask in sequence, and mechanically stir for 10 hours at 65°C to obtain a uniform casting solution. After defoaming, use a film scraper to scrape the uniform casting solution on the glass plate, soak the glass plate in the coagulation solution, and prepare the polyvinylidene fluoride PVDF film (M-Pure) by the NIPS phase inversion method, that is Ultrafiltration membrane base membrane;

[0061] 2) dopamine and cellulose co-deposition modified ultrafiltration membrane base membrane: soak the PVDF membrane obtained in step 1) in 30mL Tris buffer containing 1g / L carboxymethylcellulose CMC and 1g / L dopamine DA, Shake in a shaker at a constant speed for 2 hours to carr...

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Abstract

The invention discloses a cellulose gel layer modified loose nanofiltration membrane for high-flux dye separation as well as a preparation method and application of the cellulose gel layer modified loose nanofiltration membrane. The nanofiltration membrane comprises an ultrafiltration base membrane and a gel layer, the ultrafiltration base membrane is modified through codeposition coating of dopamine and carboxymethyl cellulose, the gel layer is of a compact three-dimensional network structure and is constructed on the surface of the modified ultrafiltration base membrane through two cross-linking reactions of carboxymethyl cellulose under the action of a cross-linking agent, the thickness of the nanofiltration membrane is 110 nm, and the pore diameter of the nanofiltration membrane is 1.38 nm. The ultrafiltration base membrane is one or more of a polyvinylidene fluoride ultrafiltration membrane, a polyether sulfone ultrafiltration membrane, a polysulfone ultrafiltration membrane and a polyimide ultrafiltration membrane, the ultrafiltration base membrane is the polyvinylidene fluoride ultrafiltration membrane, the thickness of the ultrafiltration base membrane is 100-400 microns, and the aperture of the ultrafiltration base membrane is 4.24 nm.

Description

technical field [0001] The invention belongs to the technical field of loose nanofiltration membranes, and in particular relates to a loose nanofiltration membrane modified by a cellulose gel layer for high-throughput dye separation and a preparation method and application thereof. Background technique [0002] Textile wastewater is usually composed of dyes, inorganic salts (such as NaCl, Na 2 SO 4 ), different types of surfactants, suspended solid particles, acids, alkalis and other auxiliary chemicals, it is one of the more difficult industrial wastewater to treat. As a textile powerhouse, China produces a large amount of textile wastewater every year. The direct discharge of textile wastewater will cause serious harm to the environment and human health. Therefore, the treatment of textile wastewater is extremely important for environmental protection and water resource recycling. [0003] Nanofiltration (NF for short), also known as Loose reverse osmosis membrane, is a...

Claims

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Application Information

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IPC IPC(8): B01D69/02B01D71/34B01D67/00C02F1/44C02F101/30C02F101/34C02F101/38
CPCB01D69/02B01D71/34B01D67/0006C02F1/442B01D2325/36C02F2101/308C02F2101/40C02F2101/38C02F2101/34Y02A20/131
Inventor 林立刚杨景邓雪松马文松李昕阳郑甜甜程琦
Owner TIANJIN POLYTECHNIC UNIV
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