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Preparation method and application of aminated wood aerogel for adsorbing heavy metals in water

An aerogel and amination technology, which is applied in the field of preparation of aminated wood aerogels, can solve the problem of low adsorption capacity of heavy metals, achieve high adsorption capacity, enhance various properties, and enrich the effect of active functional groups

Pending Publication Date: 2022-08-02
INNER MONGOLIA AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, natural wood has a low adsorption capacity for heavy metals, and it needs to be further modified to improve its adsorption capacity for heavy metal ions.

Method used

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  • Preparation method and application of aminated wood aerogel for adsorbing heavy metals in water
  • Preparation method and application of aminated wood aerogel for adsorbing heavy metals in water
  • Preparation method and application of aminated wood aerogel for adsorbing heavy metals in water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0047] According to the combination of the examples in Table 1, the preparation of delignified wood aerogel was carried out according to the following steps.

[0048] 1. Take poplar wood block and put it in CH 3 COOH and H 2 O 2 In the mixed solution, make the solution do not cover the wood blocks, immerse in the vacuum drying box until all the wood blocks sink to the bottom of the cup, the operation mode of the vacuum drying box is to vacuum to 0.08MPa, keep the pressure for 10-30 minutes, release the pressure, Continue to repeat the operation and leave it overnight.

[0049] 2. Take the impregnated wood block, place it in a 1000mL three-necked flask, and then add CH 3 COOH and H 2 O 2 The mixed solution is made so that the solution completely covers the wood block, boiled under conditions, after delignification reaction, the sample is carefully transferred to deionized water, the wood block is washed to neutrality, most of the residual chemical reagents are removed, and...

Embodiment 4-6

[0053] According to the combination of the examples in Table 2, the preparation of the carboxylated wood aerogel is carried out as follows. glue.

[0054] 1. Combine TEMPO, NaClO and NaClO 2 Dissolved in 0.1M PBS buffer solution with pH=6.86, take the dried delignified wood aerogel sample and slowly immerse it in the solution, and immerse it in a vacuum drying oven until all the wood pieces sink to the bottom of the beaker. The operation method is to evacuate to 0.08MPa, maintain the pressure for 10-30 minutes, release the pressure, and continue to repeat the operation.

[0055] 2. Seal the beaker with plastic wrap and transfer it to the oven for carboxylation reaction. Do not stir during the reaction. After the carboxylation reaction is over, add 10 mL of ethanol to stop the reaction, transfer the sample to deionized water, and wash the wood blocks to medium To remove most of the residual chemical reagents, be careful when washing to prevent the wood blocks from breaking, a...

Embodiment 7-9

[0059] According to the combination of the examples in Table 3, the preparation of the aminated wood aerogel is carried out according to the following steps. .

[0060] 1. Take 2-5 pieces of carboxylated wood aerogel and immerse it in 50ml of aqueous solution containing PEI (70000), NHS and EDC, and immerse it in a vacuum drying oven until all the samples sink to the bottom of the beaker. The operation mode of the vacuum drying oven is as follows: Evacuate to 0.08MPa, keep the pressure for 10-30 minutes, release the pressure, and continue to repeat the operation.

[0061] 2. Seal the beaker with plastic wrap, and transfer it to a constant temperature shaker for amidation reaction. After the amidation reaction is completed, transfer the sample to deionized water, wash the wood block to neutrality, and remove most of the residual chemical reagents. Care was taken during washing to prevent the pieces from shattering, and the pieces were transferred to a freeze dryer and freeze-d...

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Abstract

The invention provides a preparation method of aminated wood aerogel for adsorbing heavy metals in water. The preparation method comprises the following steps: S1, preparation of delignification wood aerogel; S2, preparation of carboxylated wood aerogel; S3, preparation of the aminated wood aerogel. According to the preparation method, a top-to-bottom design strategy is adopted, natural wood is subjected to delignification treatment through an acetic acid / hydrogen peroxide method, then delignification wood aerogel is subjected to in-situ oxidation through a TEMPO oxidation method, then carboxyl is activated through EDC / NHS, and the prepared aminated wood aerogel is subjected to adsorption testing on Zn. The aminated wood aerogel prepared by the preparation method disclosed by the invention keeps a wood pore channel structure, is regular, has rich active functional groups, and can be used for adsorbing heavy metal ions in industrial wastewater.

Description

technical field [0001] The invention relates to the technical field of adsorption materials, in particular to a preparation method and application of aminated wood aerogel for adsorbing heavy metals in water. Background technique [0002] At present, water pollution caused by heavy metal ions has become a global problem. Heavy metal ions not only pollute surface water such as seawater and rivers, but also pollute groundwater, posing a serious threat to the biota and the environment in the ecosystem. [0003] In order to solve the pollution problem of heavy metal ions on water resources, the commonly used methods include chemical precipitation method, redox method, ferrite method, ion exchange method, membrane separation method, electrochemical method, biological method, adsorption method, etc.; It is considered to be one of the most promising methods because of its simple operation, high treatment efficiency, easy regeneration of adsorbents, and no secondary pollution to the...

Claims

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Application Information

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IPC IPC(8): B01J20/291B01J20/30C02F1/28C02F101/20
CPCB01J20/291B01J20/30C02F1/28B01J2220/4825C02F2101/20Y02W10/37
Inventor 张晓涛张万奇王喜明刘慧安宇宏胡子雏钟源武静邵亚丽刘伊霆陈龙
Owner INNER MONGOLIA AGRICULTURAL UNIVERSITY
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