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Antipollution ultrafiltration membrane of amino acid grafting composite cellulose and preparation method thereof

A technology of composite cellulose and cellulose diacetate, which is applied in the field of membrane separation, can solve problems such as clogged pores and decreased water flux of the membrane, and achieve the effects of good compression resistance, easy cleaning of the membrane, and low price

Active Publication Date: 2016-07-06
BEIJING INSTITUTE OF TECHNOLOGYGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, studies have found that after grafting long-chain amphiphilic polymers, the water flux of the membrane will decrease to a considerable extent. This phenomenon can be attributed to the different degrees of grafting of the polymer chains in the membrane pores. clogged pores

Method used

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  • Antipollution ultrafiltration membrane of amino acid grafting composite cellulose and preparation method thereof
  • Antipollution ultrafiltration membrane of amino acid grafting composite cellulose and preparation method thereof
  • Antipollution ultrafiltration membrane of amino acid grafting composite cellulose and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] An anti-pollution ultrafiltration membrane of amino acid grafted composite cellulose, which is prepared by using the ultrafiltration membrane of oxidized nanocellulose composite cellulose acetate as the base membrane, activated in a solution containing EDAC and NHS, and then grafted with lysine become.

[0030] Its preparation method is carried out according to the following steps:

[0031] a. Preparation of composite fiber casting solution: after wood pulp is oxidized by TEMPO method, oxidized nanocellulose is obtained, that is, C on the cellulose 6 The hydroxyl group of the primary alcohol on the position is oxidized to a carboxyl group to form the site of the amidation reaction. The suspension containing 0.015g of acidified oxidized nanocellulose is dispersed in 17g of solvent N,N-dimethylamide After ultrasonic oscillation for 30min, stirring at 200r / min for 4-6h in a water bath at 40°C, then adding 3g of cellulose diacetate and completely dissolving it in the solve...

Embodiment 2

[0039] An anti-pollution ultrafiltration membrane of amino acid grafted composite cellulose, which is prepared by using the ultrafiltration membrane of oxidized nanocellulose composite cellulose acetate as the base membrane, activated in a solution containing EDAC and NHS, and then grafted with lysine become.

[0040] Its preparation method is carried out according to the following steps:

[0041] a. Preparation of composite fiber casting solution: after wood pulp is oxidized by TEMPO method, oxidized nanocellulose is obtained, that is, C on the cellulose 6 The hydroxyl group of the primary alcohol on the position is oxidized to a carboxyl group to form the site of the amidation reaction. The suspension containing 0.015g of acidified oxidized nanocellulose is dispersed in 17g of solvent N,N-dimethylamide After ultrasonic oscillation for 30min, stirring at 250r / min for 5h in a water bath at 45°C, 3g of cellulose diacetate was added and completely dissolved in the solvent N,N-d...

Embodiment 3

[0049] An anti-pollution ultrafiltration membrane of amino acid grafted composite cellulose, which is prepared by using the ultrafiltration membrane of oxidized nanocellulose composite cellulose acetate as the base membrane, activated in a solution containing EDAC and NHS, and then grafted with lysine become.

[0050] Its preparation method is carried out according to the following steps:

[0051] a. Preparation of composite fiber casting solution: after wood pulp is oxidized by TEMPO method, oxidized nanocellulose is obtained, that is, C on the cellulose 6 The hydroxyl group of the primary alcohol on the position is oxidized to a carboxyl group to form the site of the amidation reaction. The suspension containing 0.015g of acidified oxidized nanocellulose is dispersed in 17g of solvent N,N-dimethylamide After ultrasonic oscillation for 30min, stirring at 300r / min in a water bath at 50°C for 6h, then adding 3g of cellulose diacetate and completely dissolving it in the solvent...

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Abstract

The invention discloses an antipollution ultrafiltration membrane of amino acid grafting composite cellulose. An ultrafiltration membrane of sodium oxide nanocellulose composite cellulose acetate is adopted as a basic membrane and activated in a solution containing a carbonyl activating agent formed by a condensating agent and amide and is then grafted with amino acid to obtain the antipollution ultrafiltration membrane, the chemical general formula of the amino acid is NH2-R-CH(NH2)-COOH, wherein R is an alkyl chain. The preparation method comprises the steps: preparing a primary membrane casting solution; preparing a composite cellulose membrane casting solution; preparing a composite cellulose ultrafiltration membrane; activating: activating carbonyl functional groups in the sodium oxide nanocellulose; and grafting: washing the activated composite cellulose ultrafiltration membrane, and soaking in an amino acid solution to obtain the composite cellulose ultrafiltration membrane. The ultrafiltration membrane prepared by adopting the preparation method of the invention has the advantages of good compressive compactness, good antipollution effect, easiness for washing the membrane and the like; and the cellulose is wide in source, low in price, low in cost, wide in application field, easy to degrade and harmless to the environment.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to an anti-pollution ultrafiltration membrane of amino acid grafted composite cellulose and a preparation method thereof. Background technique [0002] Membrane separation science involves many disciplines such as material science engineering and process control, and is a new field of cross generation. The ultrafiltration process is a process of separating colloids in the solution, particles with larger molecular weights from water and other small molecule solutes under a certain external pressure. Due to the advantages of simple operation and suitable for large-scale continuous and automatic separation, the membrane selective separation process has been widely used in food, medicine, hygiene, biology, chemical industry, petroleum, seawater desalination and other fields, resulting in huge social benefits and economic benefits. [0003] During the membrane s...

Claims

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Application Information

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IPC IPC(8): B01D71/10B01D69/12B01D67/00
CPCB01D67/0013B01D71/10B01D2323/38
Inventor 张大伦秦笃建邵自强张茜荃王亚龙刘川渟张仁旭彭欢
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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