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Chitosan/bacterial cellulose composite aerogel adsorbent and preparation method and application thereof

A technology of bacterial cellulose and composite aerogel, which is applied in chemical instruments and methods, adsorbed water/sewage treatment, other chemical processes, etc. The effect of improving mechanical properties and stability, low cost and simple synthesis method

Active Publication Date: 2020-07-03
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN201910878706.0 discloses a preparation method of chitosan / aminated graphene oxide nanocomposite membrane adsorbent, first modifying graphene oxide with ethylenediamine, then blending with chitosan acetic acid solution, using flow Extend method to prepare described adsorbent, for Cu 2+ The adsorption of this method is more complicated, and the cost of raw materials is high, which is not conducive to practical application
Patent CN201410829649.4 discloses a method for preparing a cross-linked chitosan adsorbent, using glutaraldehyde as a cross-linking agent and combining freeze-drying technology to prepare the adsorbent, because glutaraldehyde is used in the preparation process. Toxic chemical cross-linking reagents, which also limits the application of this adsorbent

Method used

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  • Chitosan/bacterial cellulose composite aerogel adsorbent and preparation method and application thereof
  • Chitosan/bacterial cellulose composite aerogel adsorbent and preparation method and application thereof
  • Chitosan/bacterial cellulose composite aerogel adsorbent and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0040] (1) Put the bacterial cellulose hydrogel into 2mol / L NaOH lye, soak at 80°C for desugaring, wash with deionized water until neutral after soaking for 3 hours;

[0041] (2) Break the bacterial cellulose hydrogel block washed to neutral three times with a juice extractor, take the slurry in a beaker with a straw, dilute with deionized water and stir for 0.5h, stir evenly, and obtain a solid content of 1g / The bacterial cellulose aqueous solution of L;

[0042] (3) Take 50ml of the above bacterial cellulose aqueous solution, according to the mass volume ratio of organic acid to bacterial cellulose aqueous solution is 0.02:1g / ml, add 1.0g malic acid, then place it in a magnetic stirrer and stir evenly, add 0.5g chitosan Sugar (-COOH in malic acid and -NH in chitosan 2 The mol ratio is 5:1), and continued stirring for 12h to obtain a mixed sol;

[0043] (4) draw the mixed sol in step (3) with a syringe, add dropwise in the petri dish that 1mol / LNaOH solution is housed, sti...

Embodiment 2

[0051] (1) Put the bacterial cellulose hydrogel in 3mol / L NaOH lye, soak at 90°C for desugaring, wash with deionized water until neutral after soaking for 1 hour;

[0052] (2) Break the bacterial cellulose hydrogel block washed to neutral three times with a juice extractor, take the slurry in a beaker with a straw, dilute with deionized water and stir for 0.5h, stir evenly, and obtain a solid content of 1g / The bacterial cellulose aqueous solution of L;

[0053] (3) Take 50ml of the above-mentioned bacterial cellulose aqueous solution, according to the mass volume ratio of organic acid and bacterial cellulose aqueous solution is 0.024:1g / ml, add 1.2g of malic acid, then put it in a stirrer and stir evenly, add 0.5g of chitosan (-COOH in malic acid and -NH in chitosan 2 The mol ratio is 6:1), and continued stirring for 18h to obtain a mixed sol;

[0054] (4) draw the mixed sol in step (3) with a syringe, add dropwise in the petri dish that 2mol / LNaOH solution is housed, stir ...

Embodiment 3

[0059] (1) Put the bacterial cellulose hydrogel in 4mol / L NaOH lye, soak at 70°C for desugaring, wash with deionized water until neutral after soaking for 5 hours;

[0060] (2) Break the bacterial cellulose hydrogel block washed to neutral three times with a juice extractor, take the slurry in a beaker with a straw, dilute with deionized water and stir for 0.5h, stir evenly, and obtain a solid content of 1g / The bacterial cellulose aqueous solution of L;

[0061] (3) Take 50ml of the bacterial cellulose aqueous solution mentioned above, according to the mass volume ratio of the organic acid to the bacterial cellulose aqueous solution is 0.03:1g / ml, add 1.5g of malic acid, stir on a magnetic stirrer until completely dissolved, then add 0.5g Chitosan (-COOH in malic acid and -NH in chitosan 2 Molar ratio is 7:1), continuous stirring 24h, obtain mixed sol;

[0062] (4) draw the mixed sol in step (3) with a syringe, add dropwise in the petri dish that 3mol / LNaOH solution is hous...

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Abstract

The invention discloses a chitosan / bacterial cellulose composite aerogel adsorbent and a preparation method and application thereof. The method comprises the following steps: 1, desugaring bacterial cellulose hydrogel, crushing to obtain slurry, diluting with water, uniformly stirring to obtain a bacterial cellulose aqueous solution, sequentially adding organic acid containing multiple carboxylicacid structures and chitosan, carrying out a cross-linking reaction process, dropwise adding the mixed sol into a sodium hydroxide solution for curing, carrying out solvent exchange on gel balls by using a tert-butyl alcohol solution, and carrying out freeze drying to obtain the chitosan / bacterial cellulose composite aerogel adsorbent. The chitosan / bacterial cellulose composite aerogel adsorbent prepared by the invention comprises millimeter-scale spheres, has an interpenetrating network microstructure, a high specific surface area and rich active groups, and has a higher adsorption capacity for Cu<2+> in water and is easier to separate compared with single bacterial cellulose and chitosan, in addition, the raw materials for preparing the composite adsorbent are eco-friendly and non-toxic,the cost is low, the synthesis method is simple, and the actual application is facilitated.

Description

technical field [0001] The invention belongs to the technical field of bio-based adsorption materials, and in particular relates to a chitosan / bacterial cellulose composite airgel adsorbent and a preparation method and application thereof. Background technique [0002] With the rapid development of modern industry, a large amount of Cu 2+ Wastewater enters the water environment. Copper, as one of the heavy metal elements, can damage the human nervous system, cardiovascular system and digestive system, and cause diseases such as Alzheimer's disease. At present, the adsorption method has become a popular research direction for the treatment of heavy metals in water due to its advantages of simple operation, easy cost control and wide source of adsorbents. [0003] In recent years, many scholars are keen on the application research of biological materials in the field of environmental restoration. Bacterial cellulose has received extensive attention due to its special structur...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/24B01J20/22B01J20/28047B01J20/28019C02F1/286C02F2101/20
Inventor 张志杰邵亚涛钟明峰黄晓盈
Owner SOUTH CHINA UNIV OF TECH
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