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Preparation method of a novel nanofiltration membrane based on zinc hydroxide nanowires

A zinc hydroxide and nanowire technology, applied in the field of nanofiltration membrane technology and water separation, can solve the problems of permeability and selectivity hindering development, poor chemical resistance of nanofiltration membrane, limited service life, etc., and achieve high-efficiency dye desalination. The effect of performance, easy operation and simple preparation process

Active Publication Date: 2022-04-19
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nanofiltration membranes also have disadvantages such as poor chemical resistance, limited service life, and most importantly, their development is often hindered by the trade-off between permeability and selectivity due to disordered pore structure.

Method used

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  • Preparation method of a novel nanofiltration membrane based on zinc hydroxide nanowires
  • Preparation method of a novel nanofiltration membrane based on zinc hydroxide nanowires
  • Preparation method of a novel nanofiltration membrane based on zinc hydroxide nanowires

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-6

[0029] The polyvinylidene fluoride membrane (PVDF) membrane with an average pore diameter of about 200nm produced by the German Millipore Company is used as the substrate, the effective diameter of the membrane is 5cm, and the solvent used is ultrapure water;

[0030] 1) First, pretreat the PVDF membrane, soak the PVDF membrane in a mixed solution of ethanol and water with a volume ratio of 1:3 to 1:1 for 30-60 minutes, then rinse with pure water 2-3 times for use;

[0031] 2) Mix absolute ethanol and ultrapure water at a volume ratio of 2:3 to accurately prepare 1 L of the mixed solution. Dissolve ethanolamine and zinc nitrate in the mixed solution respectively to prepare a mixed solution of ethanolamine with a concentration of 1.6mmol / L and a mixed solution of zinc nitrate with a concentration of 4mmol / L;

[0032] 3) Take 10 mL of ethanolamine mixed solution and quickly add 10 mL of zinc nitrate mixed solution, stir magnetically at room temperature for 5 minutes and then let...

Embodiment 7-11

[0038] A polyvinylidene fluoride membrane (PVDF) membrane with an average pore diameter of about 200 nm produced by Millipore, Germany, was used as the substrate, and the effective diameter of the membrane was 5 cm. The solvent used was ultrapure water.

[0039] Like the above-mentioned embodiments, the nanowire thin film prepared by the zinc hydroxide nanowire solution with a volume of 6 mL is preferred. Prepare sodium alginate with concentrations of 0.01%, 0.05%, 0.1%, 0.15%, and 0.2%, and vacuum filter onto zinc hydroxide nanofilm to prepare a new nanofiltration membrane based on zinc hydroxide nanowires. The obtained nanofiltration membrane was tested for dye removal performance in a nanofiltration device. The feed solution was 100mg / L Congo red (Mw=696.66) aqueous solution, the test pressure was 1 bar, and the test temperature was 25°C. The measured removal performance of the nanofiltration membrane to Congo red is as follows:

[0040]

Embodiment 12-16

[0042] A polyvinylidene fluoride membrane (PVDF) membrane with an average pore diameter of about 200 nm produced by Millipore, Germany, was used as the substrate, and the effective diameter of the membrane was 5 cm. The solvent used was ultrapure water.

[0043] As in the above examples, a new nanofiltration membrane based on zinc hydroxide nanowires prepared with a concentration of 0.1% sodium alginate is preferred, and the dye removal performance test is carried out in a nanofiltration device. Feed solutions were 100 mg / L methylene blue (Mw=319.85), crystal violet (Mw=407.98), neocarmine (Mw=604.47), Congo red (Mw=696.66) and Coomassie brilliant blue G250 (Mw=858.05) aqueous solution, the test pressure is 1 bar, and the test temperature is 25°C. The measured removal performance of nanofiltration membranes for different dyes is as follows:

[0044]

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Abstract

The invention discloses a preparation method of a novel nanofiltration membrane based on zinc hydroxide nanowires, using polyvinylidene fluoride membrane (PVDF) as a substrate, and suction-filtering solutions containing zinc hydroxide nanowires and sodium alginate respectively A novel nanofiltration membrane based on zinc hydroxide nanowires was obtained on a porous substrate. The preparation process of the present invention is simple, safe, low in cost, easy to operate, and the prepared nanofiltration membrane has good separation performance and stability for organic dyes, and a high desalination rate, so it is useful in the removal of organic dyes and dye desalination. with broadly application foreground.

Description

technical field [0001] The invention belongs to the field of nanofiltration membrane technology and water separation, and specifically relates to a preparation method of a novel nanofiltration membrane based on zinc hydroxide nanowires for organic dye removal and dye desalination. [0002] technical background [0003] Water plays a vital role in the survival of single-celled organisms, complex plants, animals and humans. With the continuous increase of industrial activities, water resources are polluted or destroyed. In particular, the wastewater from the synthetic dye industry contains a large amount of aromatic compounds and organic dyes, which pose a great threat to the water environment. In general, the manufacture of textiles, plastics, paper, cosmetics, etc. involves the use of large amounts of organic dyes. About 10-15% of the organic dyes produced by the textile industry are released into the environment every year. Most of these organic dyes are toxic and carcino...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D61/02B01D71/02C02F1/44C02F101/30C02F101/36C02F101/38
CPCB01D61/027B01D71/02C02F1/442C02F2101/308C02F2101/40C02F2101/38C02F2101/36Y02A20/131
Inventor 吴梦瑶周勇高从堦
Owner ZHEJIANG UNIV OF TECH
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