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High-strength dialdehyde microfibrillar cellulose/chitosan composite membrane and preparation method and application thereof

A technology of microcrystalline cellulose and chitosan, applied in chemical instruments and methods, alkali metal compounds, alkali metal oxides/hydroxides, etc., can solve the problem of poor mechanical properties and low stability of pure chitosan membranes problems, achieve high strength, improved mechanical strength, and increased adsorption performance

Inactive Publication Date: 2016-04-20
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to improve the defects of poor mechanical properties and low stability of the existing pure chitosan film, and provide a high-strength dialdehyde microfibrillated cellulose / chitosan composite film

Method used

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  • High-strength dialdehyde microfibrillar cellulose/chitosan composite membrane and preparation method and application thereof
  • High-strength dialdehyde microfibrillar cellulose/chitosan composite membrane and preparation method and application thereof
  • High-strength dialdehyde microfibrillar cellulose/chitosan composite membrane and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0033] Preparation of pure chitosan film: (1) Add 1 g of chitosan to 100 mL of 1 wt% acetic acid solution, stir in a constant temperature water bath at 55 °C for 2 h to obtain chitosan solution; (2) cast chitosan The sugar solution was spread on a polytetrafluoroethylene plate and dried at 40°C to form a film.

Embodiment 2

[0035] A preparation method of high-strength dialdehyde microfibrillated cellulose / chitosan composite film, comprising the steps of:

[0036] (1) Soak microcrystalline cellulose in 10% NaOH aqueous solution, stir at 60°C for 2 hours, and filter. The treated microcrystalline cellulose was washed with deionized water to neutrality; mixed with deionized water and transferred to a high-pressure homogenizer, homogenized 20 times under a pressure of 1000 bar to obtain an MFC suspension with a MFC content of 0.5wt%;

[0037] (2) Add 1.6g of sodium periodate to 400g of 0.5wt% MFC suspension, stir in a constant temperature water bath at 25°C in the dark for 48 hours, then dialyze with deionized water for 2 days, let it stand, and remove part of the supernatant Afterwards, obtain the dialdehyde MFC suspension of solid content 1.93wt%;

[0038] (3) 4g chitosan is dissolved in the acetic acid solution of 400mL1wt%, obtains chitosan acetic acid solution;

[0039] (4) 4.14g of 1.93wt% dia...

Embodiment 3

[0041] A preparation method of high-strength dialdehyde microfibrillated cellulose / chitosan composite film, comprising the steps of:

[0042] (1) Soak microcrystalline cellulose in 10% NaOH aqueous solution, stir at 60°C for 2 hours, and filter. The processed microcrystalline cellulose was washed to neutrality with deionized water; mixed with deionized water and then transferred to a high-pressure homogenizer, homogenized 20 times under a pressure of 1000 bar to obtain an MFC suspension with an MFC content of 1.5wt%;

[0043] (2) Add 4.8g of sodium periodate to 400g of 1.5wt% MFC suspension, stir in a constant temperature water bath at 25°C in the dark for 48h, then dialyze with deionized water for 2 days, let it stand, and remove part of the supernatant Afterwards, obtain the dialdehyde MFC suspension of solid content 1.93wt%;

[0044] (3) 4g chitosan is dissolved in the acetic acid solution of 400mL1wt%, obtains chitosan acetic acid solution;

[0045](4) 12.4g of 1.93wt% d...

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Abstract

The invention relates to a high-strength dialdehyde microfibrillar cellulose / chitosan composite membrane and a preparation method and application thereof. The preparation method comprises the specific steps that 1, micro-fibrillation treatment is conducted on microcrystalline cellulose to obtain MFC suspension liquid; 2, oxidation treatment is conducted on the MFC suspension liquid by using periodate, dialysis is performed with deionized water for 1-3 days to remove non-reacted periodate so as to obtain dialdehyde MFC suspension liquid after the oxidation treatment is completed; 3, the dialdehyde MFC suspension liquid and a chitosan-acetic acid solution perform mixed reaction at the temperature of 50+ / -10 DEG C for 2-4 hours, and after the reaction is completed, and a reaction product is subjected to membrane spreading by adopting a tape casting method and then is dried. The composite membrane prepared by means of the preparation method has higher strength, the tensile strength is above 70 MPa, a huge network structure greatly improves the stability of a pure chitosan material in an acid solution, the composite membrane can be widely used for adsorption and treatment of dyes in wastewater, especially has efficient adsorption performance to a Congo red dye and has wide application prospect in wastewater treatment.

Description

technical field [0001] The invention belongs to the technical field of composite membrane material preparation, and specifically relates to a high-strength dialdehyde microfibrillated cellulose / chitosan composite membrane, a preparation method thereof, and an application in the aspect of absorbing dyes in waste water. Background technique [0002] With the rapid development of industry, a large amount of waste water will be produced in the production process of printing and dyeing, paper making, tanning, electroplating, etc. The waste water contains dyes, heavy metals, proteins, salts, oils, sulfides and other substances harmful to the environment. Treatment of dye-containing wastewater is tricky business. The dyes have strong chemical stability and are not easy to biodegrade, which reduces the light transmittance of water, interferes with the photosynthesis of aquatic organisms, and inhibits the growth of aquatic organisms; moreover, some dyes contain carcinogens, which wil...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28
CPCB01J20/24B01J20/22B01J20/28033B01J2220/44B01J2220/4825C02F1/286
Inventor 郑学晶李潇潇李锦阳张倩楠裴莹刘捷汤克勇
Owner ZHENGZHOU UNIV
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