Preparation and application of sodium alginate-based aerogel

A technology of sodium alginate and aerogel, which is applied in the field of biomass-based functional material preparation, can solve the problems of low toxicity of methylenebisacrylamide, inability to be used in the field of food processing, inability to carry out heavy metal adsorption, etc. Convenience, easy mass production and popularization, easy to control effect

Active Publication Date: 2021-10-08
OCEAN UNIV OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] There are also various shortcomings and deficiencies in the preparation of sodium alginate-based airgel pellets in the prior art, for example, Hainan University Master's Thesis "Sodium Alginate Preparation, Reinforcement and Hydrophobic Modification of Alginate-based Airgel” discloses the preparation of a sodium alginate-based airgel. The main technical route it adopts is: using the reverse drop ball method, adding gluco Methylbisacrylamide and sodium carboxymethylcellulose are used for structural reinforcement. The disadvantages or deficiencies are: the preparation process is complicated, it is difficult to carry out large-scale production, and the cost is high, and methylenebisacrylamide has Low toxicity, insufficient safety, can not be used in the field of food processing, narrow application range
The disadvantages or shortcomings are: the preparation process is complex, and dodecyltrichlorosilane is a highly toxic organic reagent with poor safety and cannot be applied to the field of food processing
After hydrophobic modification, heavy metal adsorption cannot be performed

Method used

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  • Preparation and application of sodium alginate-based aerogel
  • Preparation and application of sodium alginate-based aerogel
  • Preparation and application of sodium alginate-based aerogel

Examples

Experimental program
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Embodiment 1

[0040] Determination of the removal rate of sodium alginate-based aerogels with different pectin contents This example tests the effect of sodium alginate-based aerogels with different pectin contents on the removal rate of Cd(II) ions in aqueous solution:

[0041] Prepare the following three solutions respectively:

[0042] 2% (w / v) sodium alginate in water.

[0043] 2% (w / v) sodium alginate + 1% (w / v) pectin in water.

[0044] 2% (w / v) sodium alginate + 2% (w / v) pectin in water.

[0045] The specific steps are as follows: weigh sodium alginate and pectin powder, mix them evenly, add them into deionized water to prepare a solution, stir them with a DC mixer equipped with paddle-type stirring paddles until uniform, and stand in a water bath at 25°C for 18 hours.

[0046] In this example,

[0047] The specific parameters of sodium alginate are: G / M<1, 815mPa·s, 80mesh.

[0048] The specific parameters of pectin are: degree of esterification 8.4%, gel strength 135.6, galacto...

Embodiment 2

[0061] This example provides a sodium alginate-based airgel and its performance measurement.

[0062] The specific parameters of sodium alginate used are: G / M<1, 815mPa·s, 80mesh.

[0063] The specific parameters of pectin are: degree of esterification 8.4%, gel strength 135.6, galactose carboxylic acid 69.1%.

[0064] According to the method of the above-mentioned Example 1, configure 2% (w / v) sodium alginate+3% (w / v) pectin aqueous solution;

[0065] Stir with a DC mixer equipped with a paddle-type stirring paddle until uniform, and stand in a water bath at 25°C for 16h. A calcium lactate solution with a mass concentration of 1% (w / v) was prepared with deionized water.

[0066] Use a peristaltic pump to drip 2% (w / v) sodium alginate + 3% (w / v) pectin aqueous solution into the calcium lactate solution at an even speed, soak until the hydrogel beads are completely solidified, and separate the hydrogel beads. After rinsing the ball with deionized water, air-dry the water sta...

Embodiment 3

[0080] In order to improve the efficiency of cross-linking sodium alginate-pectin blending and cross-linking, in the preparation process of this embodiment, electric field treatment is added, and the sodium alginate-pectin aqueous solution prepared in step (1) and the calcium salt prepared in step (2) The aqueous solution is placed in an electrostatic electric field, the electric field voltage is 1.0-2.5KV, and the treatment time is 1-8h; after the electric field treatment is completed, proceed to step (3) gel granulation. After electric field treatment, the cross-linking of sodium alginate-pectin is more stable, the granulation effect is better, and the pelleting rate is higher. At present, at the laboratory stage, 3g of pectin and 2g of sodium alginate can prepare at least 3.92g of airgel material, and the dehydration rate during the preparation of airgel is as high as 95-98%.

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Abstract

The invention discloses preparation and application of sodium alginate-based aerogel globules. The adsorbent material is prepared by a method including the steps of: well mixing sodium alginate and pectin powder, adding deionized water and stirring well, standing, dropwise adding the mixed aqueous solution into a calcium salt aqueous solution at a constant speed by using a peristaltic pump, soaking for several hours, separating out hydrogel globules, washing the hydrogel globules with deionized water, air-drying the hydrogel globules, and freeze-drying the hydrogel globules. The aerogel globules prepared by the method have a good adsorption effect on heavy metal ions such as Cd (II), Pb (II) and Cr (III), are an environment-friendly adsorption material, can be applied to multiple fields such as sewage treatment, food processing and biochemical engineering, and have the outstanding advantages of simplicity in preparation, high safety, low cost, easiness in separation, high adsorption capacity, stable adsorption effect and the like.

Description

technical field [0001] The invention relates to the preparation of a sodium alginate-based airgel and its application as a heavy metal adsorbent, which can be applied to the technical fields of water pollution treatment and food processing, and belongs to the technical field of preparation of biomass-based functional materials. Background technique [0002] The problem of heavy metal pollution has increasingly become a difficult problem in sewage treatment, drinking water purification, food processing and other fields. At present, the most important heavy metal removal technologies include: chemical method, physical method, biological method, adsorption method and so on. Among them, the adsorption method is one of the most commonly used, simplest and most effective methods. However, different types of adsorbents may have problems such as high cost, complicated preparation process, insufficient safety, and difficulty in separation. [0003] Sodium alginate (SA) is a natural...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/00B01J20/24B01J20/28B01J20/30C02F1/28A23L5/20C02F101/20C02F101/22
CPCB01J13/0095B01J20/28057B01J20/24B01J20/28047C02F1/286A23L5/27C02F2101/20C02F2101/22
Inventor 徐莹陈虞汪东风孙逊
Owner OCEAN UNIV OF CHINA
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