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Preparation method of nanoparticle-containing modified cellulose ultrafiltration membrane

A nanoparticle modification, nanocellulose technology, applied in ultrafiltration, chemical instruments and methods, membranes, etc., can solve the problems of poor anti-pollution, poor acid and alkali resistance, and reduced service life of ultrafiltration membranes, and achieve excellent Oxide resistance, good mechanical properties, high water flux effect

Inactive Publication Date: 2021-02-05
杭州鹿扬科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, cellulose acetate has disadvantages such as poor acid and alkali resistance, easy contamination, poor antibacterial ability, and poor compaction resistance. The ultrafiltration membrane prepared by it has poor anti-pollution performance, which reduces the service life of the membrane and restricts the development and application of the membrane

Method used

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  • Preparation method of nanoparticle-containing modified cellulose ultrafiltration membrane
  • Preparation method of nanoparticle-containing modified cellulose ultrafiltration membrane
  • Preparation method of nanoparticle-containing modified cellulose ultrafiltration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Embodiment 1: a kind of silica nanoparticle:

[0069] 1) Dissolve 2g of cetyltrimethylammonium bromide in 8g of 1.0mol / L sodium hydroxide solution to make a weakly alkaline solution, slowly drop in 15g of tetraethyl orthosilicate at a rate of 5mL / min, 50 Stir at a high speed of 4500r / min for 4 hours at ℃ until a precipitate is formed, and the precipitate is washed with methanol and deionized water in turn until the washing liquid is neutral;

[0070] 2) Step 1) Dry the precipitate in a vacuum oven at 60°C to constant weight, add 3-aminopropyl-triethoxysilane 5 times the weight of the precipitate and 150g of absolute ethanol, reflux in a -80°C refrigerator for 12 hours, and anhydrous After washing with ethanol for 3 times, dry in a vacuum oven at 50°C for 4 hours to obtain aminated silica nanoparticles;

[0071] 3) Dissolve 1 g of hyaluronic acid (molecular weight 1000 KDa) in a large amount of deionized water, adjust the pH to 4.8, add 50 mg of EDC and 80 mg of NHS, st...

Embodiment 2

[0072] Example 2: Another silica nanoparticle:

[0073] Dissolve 2g of cetyltrimethylammonium bromide in 8g of 1.0mol / L sodium hydroxide solution to make a weakly alkaline solution, slowly drop in 15g of tetraethyl orthosilicate at a rate of 5mL / min, at 50°C Stir at a high speed of 4500r / min for 4h until precipitation occurs, wash the precipitate with methanol and deionized water in turn until the washing solution is neutral, and dry in a vacuum oven at 60°C until constant weight.

Embodiment 3

[0074] Example 3: Another silica nanoparticle:

[0075] 1) Dissolve 2g of cetyltrimethylammonium bromide in 8g of 1.0mol / L sodium hydroxide solution to make a weakly alkaline solution, slowly drop in 15g of tetraethyl orthosilicate at a rate of 5mL / min, 50 Stir at a high speed of 4500r / min for 4 hours at ℃ until a precipitate is formed, and the precipitate is washed with methanol and deionized water in turn until the washing liquid is neutral;

[0076] 2) Step 1) Dry the precipitate in a vacuum oven at 60°C to constant weight, add 3-aminopropyl-triethoxysilane 5 times the weight of the precipitate and 150g of absolute ethanol, reflux in a -80°C refrigerator for 12 hours, and anhydrous After washing with ethanol for 3 times, dry in a vacuum oven at 50° C. for 4 hours to obtain aminated silica nanoparticles.

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Abstract

The invention relates to the technical field of functional polymer ultrafiltration membrane materials, in particular to a preparation method of a nanoparticle-containing modified cellulose ultrafiltration membrane, which comprises the following steps: S1, activating microcrystalline cellulose in glacial acetic acid, and adding acetic anhydride and concentrated sulfuric acid to prepare cellulose acetate, S2, adding nano cellulose into N, N-dimethylformamide and acetone, fully dispersing, then adding cellulose acetate, hyaluronic acid functionalized silicon dioxide nanoparticles and polyethyleneglycol, fully mixing and dissolving to be uniform, defoaming and filtering to obtain a membrane casting solution, and S3, casting the membrane casting solution onto a clean glass plate, scraping intoa membrane by using a membrane scraping knife, evaporating the solvent, immersing the glass into a gel bath, removing, taking the membrane, soaking into a glycerol aqueous solution, washing, and drying to obtain the product. The preparation method is simple, the mechanical strength of the ultrafiltration membrane is higher, the anti-pollution capability is stronger, the bacteriostatic and antibacterial effects are better, and the cellulose ultrafiltration membrane has excellent oxide tolerance, so that the service life of the cellulose ultrafiltration membrane is prolonged.

Description

technical field [0001] The invention relates to the technical field of functional polymer ultrafiltration membrane materials, in particular to a preparation method of a modified cellulose ultrafiltration membrane containing nanoparticles. Background technique [0002] As a green and energy-saving emerging industrial technology, membrane technology is an important technology to solve the problems of resource-based water shortage and water quality-based water shortage, and has become the mainstream technology of water treatment. Ultrafiltration is a membrane separation process that takes pressure difference as the driving force and uses the screening mechanism to intercept macromolecular solutes and separate them from solvents or small molecular solutes according to the size of substances. It is the main force of membrane wastewater treatment. The effective pore size of the ultrafiltration membrane is generally between 2 and 100nm. Using the screening function of the micropore...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/02B01D61/14B01D71/10B01D67/00
CPCB01D61/145B01D67/0079B01D69/02B01D71/10B01D2325/48
Inventor 不公告发明人
Owner 杭州鹿扬科技有限公司
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