Preparation method and application of nano microcrystalline cellulose/dopamine composite film

A technology of nano-crystallite and cellulose, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of using and not being able to be used as a semi-permeable membrane, achieve good ion removal rate, and improve mechanical properties and separation performance, and the effect of promoting gelation

Inactive Publication Date: 2020-04-14
安徽勉以信网络科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The above-mentioned cellulose nanocrystal/chitosan composite membrane and chitosan/nanocrystalline cellulose composite membrane are mainly used...

Method used

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  • Preparation method and application of nano microcrystalline cellulose/dopamine composite film
  • Preparation method and application of nano microcrystalline cellulose/dopamine composite film

Examples

Experimental program
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Embodiment 1

[0030] A preparation method of nano-microcrystalline cellulose / dopamine composite film, specifically as follows:

[0031] Corn bran was dried and crushed into powder, passed through a 200-mesh sieve, wrapped with nylon cloth, placed in a Soxhlet extractor, refluxed for 6 hours with a mixed solution of ether and n-hexane with a volume ratio of 3:1, and then filtered and dried (corn bran The mass ratio of the powder to the mixed solution of ether and n-hexane is 1:12), then added to the α-amylase solution with a mass concentration of 20%, adjusted the pH to 5-6 with citric acid, and heated to 45°C to hydrolyze 3.5 Centrifuge after h, wash the precipitate with water until it is neutral, add it to a NaOH solution with a mass concentration of 35%, and treat it ultrasonically at 90°C for 80 minutes, centrifuge, wash the precipitate with water until it is neutral, and dry it fully at 70°C to obtain prefabricated cellulose; prefabricated fiber Add the element into dimethyl sulfoxide, ...

Embodiment 2

[0033] A preparation method of nano-microcrystalline cellulose / dopamine composite film, specifically as follows:

[0034]Corn bran is dried and pulverized into powder, passed through a 200-mesh sieve, wrapped with nylon cloth, placed in a Soxhlet extractor, refluxed for 10 h with a mixed solution of ether and n-hexane with a volume ratio of 3:1, and then filtered and dried (corn bran The mass ratio of the powder to the mixed solution of ether and n-hexane is 1:15), and then added to the α-amylase solution with a mass concentration of 25%, adjusted the pH to 5-6 with citric acid, and heated to 50°C for 4 hours for hydrolysis After centrifugation, the precipitate was washed to neutrality and then added to a NaOH solution with a mass concentration of 35% for 75 minutes of ultrasonic treatment at 90°C, centrifuged, the precipitate was washed to neutrality and then fully dried at 80°C to obtain prefabricated cellulose; the prefabricated cellulose Add it into dimethyl sulfoxide, sti...

Embodiment 3

[0036] A preparation method of nano-microcrystalline cellulose / dopamine composite film, specifically as follows:

[0037] Corn bran is dried and pulverized into powder, passed through a 200-mesh sieve, wrapped with nylon cloth, placed in a Soxhlet extractor, refluxed for 10 h with a mixed solution of ether and n-hexane with a volume ratio of 3:1, and then filtered and dried (corn bran The mass ratio of the powder to the mixed solution of ether and n-hexane is 1:8), then added to the α-amylase solution with a mass concentration of 15%, adjusted the pH to 5-6 with citric acid, and heated to 42°C for 3 hours for hydrolysis After centrifugation, the precipitate was washed to neutrality and then added to a NaOH solution with a mass concentration of 40% for 80 min at 90°C, centrifuged, the precipitate was washed to neutrality and then fully dried at 65°C to obtain prefabricated cellulose; the prefabricated cellulose Add to dimethyl sulfoxide, stir at 400r / min to raise the temperatur...

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Abstract

The invention provides a preparation method and application of a nano microcrystalline cellulose/dopamine composite film, and relates to the field of semipermeable film materials, and the method comprises the following steps: preparing prefabricated cellulose; preparing nano microcrystalline cellulose;mixing the nano microcrystalline cellulose, dopamine, K-carrageenan and N-methyl morpholine oxide, heating to 110-120 DEG C, stirring for 30 to 40min, dissolving and clearing, adding a trihydroxymethylaminomethane buffer solution to adjust the pH value to 8-9, standing for 20 to 25h, decompressing and defoamingtoobtain a film solution, casting the filmsolution onto a polytetrafluoroethylene glass plate, putting the mixture into a drying oven to be subjected to vacuum drying for 10 to 15h at 30 to 50 DEG C, immersing the polytetrafluoroethylene glass plate into deionized water, scraping afilm off by a scraper, and drying to obtainthe nano microcrystalline cellulose/dopamine composite film.The nano microcrystalline cellulose/dopamine composite film has the advantages of good ion removal rate (up to 99% or above), extremely high water flux, extremely high application prospect in sewagetreatment and sea water desalination, and good mechanical property and swelling property.

Description

technical field [0001] The invention relates to the field of semipermeable membrane materials, in particular to a preparation method and application of a nano-microcrystalline cellulose / dopamine composite membrane. Background technique [0002] my country is a big corn producing country, and every year there is a large amount of corn husk, a by-product of corn processing. At present, many enterprises only use it as feed or discard it, resulting in a great waste of resources. Compared with other grain husks (bamboo, rice bran, wheat bran, etc.), corn bran not only has high fiber content, but also has a good structure. The fiber size molecules in the fiber crystallization area are arranged in layers and have poor regularity. And strong hydrogen bonding makes it have high crystallinity, good chemical reactivity, easy to extract, and nanocrystalline cellulose (NCC) separated from natural plant fibers by acid hydrolysis, enzymatic hydrolysis and other methods has nanocrystalline ...

Claims

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Application Information

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IPC IPC(8): B01D71/10B01D69/12B01D67/00C02F1/44C02F103/08
CPCB01D67/0011B01D67/0016B01D69/12B01D71/10C02F1/44C02F2103/08Y02A20/131
Inventor 陈庆
Owner 安徽勉以信网络科技有限公司
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