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A polyamide composite nanofiltration membrane modified by black talc nanoparticles

A technology of nanoparticle modification and composite nanofiltration membrane, which is applied in the direction of membrane, membrane technology, and semipermeable membrane separation. It can solve the problems of low mechanical strength, poor separation performance, and easy contamination of the membrane, achieving excellent mechanical properties, Low production cost and the effect of improving water flux

Active Publication Date: 2022-05-24
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the defects of the prior art that the membrane is easily polluted, the separation performance is poor, and the mechanical strength is low, the invention provides a black talc nanoparticle modified polyamide composite nanofiltration membrane and its preparation method

Method used

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  • A polyamide composite nanofiltration membrane modified by black talc nanoparticles
  • A polyamide composite nanofiltration membrane modified by black talc nanoparticles
  • A polyamide composite nanofiltration membrane modified by black talc nanoparticles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) 10g black talc (black talc originates from Guangfeng District, Shangrao City, Jiangxi Province) is ball-milled, wet-milled with a ball mill 600r / min for 5h, washed with water, centrifuged and dried to obtain 8.8g of black talc nanoparticles (average particle size is 220nm) ). Then 0.369g of black talc nanoparticles were added to 20mL of N-methylpyrrolidone solvent, ultrasonicated (100W 40KHz) for 1h to make it uniformly dispersed, then 3.86g of polysulfone was added and stirred to dissolve for 12h. Uniform casting fluid.

[0042] (2) Use a scraper to scrape 2 mL of the casting liquid onto the glass plate, then put it into the deionized water coagulation bath quickly, and after the phase inversion is complete, obtain a 130 cm 2 The black talc nanoparticle / polysulfone support layer was transferred to deionized water for solvent exchange for 24h.

[0043] (3) Immerse the black talc nanoparticle / polysulfone porous support membrane in 10 mL of anhydrous piperazine aqueou...

Embodiment 2

[0046] (1) 10g black talc (black talc originates from Guangfeng District, Shangrao City, Jiangxi Province) is ball-milled, wet-ground with a ball mill 600r / min for 5h, washed with water, and centrifuged to dry to obtain 8.8g of black talc nanoparticles (average particle size is 220nm). Then 0.215g of black talc nanoparticles were added to 20mL of N-methylpyrrolidone solvent, ultrasonicated (100W 40KHz) for 1.5h to make it evenly dispersed, then 2.58g of polysulfone was added and stirred to dissolve for 12h, and let stand for defoaming to form 26mL Stable and uniform casting liquid.

[0047] (2) Use a scraper to scrape 2 mL of the casting solution onto the glass plate, and then put it into the deionized water coagulation bath quickly. After the phase inversion is complete, 130 cm 2 The black talc nanoparticles / polysulfone support layer was transferred to deionized water for solvent exchange for 24h for use;

[0048] (3) Immerse the black talc nanoparticle / polysulfone porous s...

Embodiment 3

[0051] (1) 10g black talc (black talc originates from Guangfeng District, Shangrao City, Jiangxi Province) is ball-milled, wet-ground with a ball mill 600r / min for 5h, washed with water, and centrifuged to dry to obtain 8.8g of black talc nanoparticles (average particle size is 220nm). Then, 0.826g of black talc nanoparticles were added to 15mL of N-methylpyrrolidone solvent, ultrasonicated (100W 40KHz) for 1h to make it evenly dispersed, then 2.48g of polysulfone was added and stirred to dissolve for 12h. Uniform casting fluid.

[0052] (2) Use a scraper to scrape 2 mL of the casting solution onto the glass plate, and then put it into the deionized water coagulation bath quickly. After the phase inversion is complete, 130 cm 2 The black talc nanoparticle / polysulfone support layer was transferred to deionized water for further solvent exchange for 24h.

[0053] (3) Immerse the black talc nanoparticle / polysulfone porous support membrane in 10 mL of a triethanolamine aqueous s...

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Abstract

The invention discloses a polyamide nanofiltration membrane modified by black talc nanoparticles and a preparation method thereof. For the first time, black talc nanoparticles were used as the membrane modification material. The black talc nanoparticles were added to the casting solution and stirred evenly. After standing still for degassing, the film was scraped to introduce it into the support membrane, and then the black talc nanoparticles were prepared by interfacial polymerization. Blended modified polyamide nanofiltration membrane. The modification method of introducing black talc nanoparticles into the support membrane can effectively adjust the pore structure and porosity of the support membrane, and realize the effective regulation of the structure of the PA active layer and the separation performance of the nanofiltration membrane, which can greatly improve the separation performance without affecting the separation performance. The water flux, mechanical strength and anti-pollution performance of the membrane are improved; the membrane production method is low in cost, simple and controllable, and has a good industrial application prospect.

Description

technical field [0001] The invention belongs to the technical field of water treatment membranes, in particular to a black talc nanoparticle-modified polyamide composite nanofiltration membrane which improves the separation performance, membrane strength and membrane anti-pollution performance of a polyamide nanofiltration membrane by adding black talc nanoparticles Membrane preparation method. Background technique [0002] Due to rapid population and economic growth, water pollution and water scarcity have become global challenges. Current research is generally focused on developing advanced materials and technologies that can be used to increase freshwater supply through desalination or wastewater recycling. Among all existing desalination technologies, pressure-driven membrane technologies, such as reverse osmosis (RO) and nanofiltration (NF), are among the most efficient and promising. Among them, the nanofiltration membrane can achieve the interception of multivalent ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/12B01D61/00B01D69/10B01D67/00
CPCB01D69/12B01D61/027B01D69/10B01D69/105B01D67/0079B01D2325/24
Inventor 张国亮范子璇张旭孟琴
Owner ZHEJIANG UNIV OF TECH
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