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Preparation method and application of chitosan/tap water plant aluminum sludge composite aerogel adsorption material

A composite airgel, waterworks technology, applied in the direction of water/sludge/sewage treatment, water pollutants, water/sewage treatment, etc., to achieve the effect of simple preparation method, large specific surface area and high selectivity

Active Publication Date: 2019-08-16
NANHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it has not been reported that chitosan / water plant aluminum sludge composite airgel is used as an adsorbent to treat low-concentration uranium-containing wastewater.

Method used

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  • Preparation method and application of chitosan/tap water plant aluminum sludge composite aerogel adsorption material
  • Preparation method and application of chitosan/tap water plant aluminum sludge composite aerogel adsorption material
  • Preparation method and application of chitosan/tap water plant aluminum sludge composite aerogel adsorption material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Preparation of chitosan / waterworks aluminum sludge composite airgel adsorbent materials with different mass ratios of chitosan and sludge:

[0035] (1) dissolving chitosan in a glacial acetic acid solution with a volume fraction of 1% to obtain a chitosan solution with a mass fraction of 0.1 to 10%;

[0036] (2) Get the dried aluminum sludge from the waterworks, add 10% blowing agent to it, and obtain the sludge slurry with the same mass fraction;

[0037] (3) Chitosan solution and mud are mixed and stirred evenly, and cryogenically frozen to make the material dense and uniform;

[0038] (4) Thaw with ethanol to separate out internal organic matter and moisture;

[0039] (5) Put the thawed composite airgel material into a pH 4-6 dilute hydrochloric acid solution, so that the foaming agent in the material reacts with the acid to generate gas, which escapes to form a composite adsorption material with a large number of pores;

[0040] (6) Appropriately shred the composi...

Embodiment 2

[0055] Preparation of chitosan / waterworks aluminum sludge composite airgel materials with different foaming dosages:

[0056] (1) dissolving chitosan in the glacial acetic acid that volume fraction is 1% obtains the chitosan solution of mass fraction 4%;

[0057] (2) Take an appropriate amount of dried aluminum sludge from a waterworks, and add 0.1 to 30% foaming agent therein to obtain sludge sludge with different foaming doses;

[0058] (3) Chitosan solution is mixed and stirred evenly with mud, and now chitosan mass fraction is 4%, and sludge mass fraction is 2%, namely chitosan is 4:2 than waterworks aluminum sludge mass ratio; Low-temperature freezing makes the material dense and uniform;

[0059](4) Thaw with ethanol to precipitate internal organic matter and moisture, and then soak in absolute ethanol for 1 to 3 hours;

[0060] (5) Put the thawed composite airgel material into a dilute hydrochloric acid solution with a pH of 4 to 6, so that the foaming agent in the ma...

Embodiment 3

[0070] Prepare a sufficient amount of chitosan and sludge mass ratio of 4%: 2%, foaming dosage of 20% chitosan / waterworks aluminum sludge composite airgel adsorbent material, the specific implementation steps are as follows:

[0071] (1) Chitosan is dissolved in 1 to 3% glacial acetic acid to obtain a chitosan solution with a mass fraction of 4%;

[0072] (2) Take and dry the aluminum sludge of the waterworks, add 20% blowing agent to it, obtain the sludge slurry of the same mass fraction;

[0073] (3) Chitosan solution and mud are mixed and stirred evenly, and cryogenically frozen to make the material dense and uniform;

[0074] (4) Thaw with ethanol, separate out the internal organic matter and moisture, and then soak for 1 hour;

[0075] (5) Put the thawed composite airgel material into a dilute hydrochloric acid solution with a pH of 4 to 6, so that the foaming agent in the material reacts with the acid to generate gas, which escapes to form a composite adsorption materia...

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Abstract

The invention relates to a preparation method of a composite aerogel adsorbent. The preparation method of the chitosan / tap water plant aluminum sludge composite aerogel adsorption material comprises the following steps: 1) dissolving chitosan into 1-3 vol% glacial acetic acid to obtain a 0.1-10 mass% chitosan solution; 2) drying the tap water plant aluminum sludge, and adding 0.1-30% of a foamingagent into the tap water plant aluminum sludge to obtain sludge slurry; 3) uniformly mixing and stirring the obtained chitosan solution and sludge slurry, and performing low-temperature freezing untilthe material is compact and uniform; 4) unfreezing the material with absolute ethyl alcohol to separate out internal organic substances and water; and 5) adding the unfrozen composite aerogel material into an acidic solution to enable a foaming agent in the material to react with acid until gas is generated and escaped, thereby finally forming the composite adsorption material with a large numberof pores. The chitosan sludge composite aerogel adsorbent obtained by the preparation method is large in specific surface area, relatively high in selectivity on low-concentration uranium-containingwastewater, high in adsorption capacity and short in adsorption time, and has a relatively high removal rate on low-concentration uranium.

Description

technical field [0001] The invention relates to a preparation method of a composite airgel adsorbent, in particular to a preparation method of a chitosan / water plant aluminum sludge composite airgel and its application in the treatment of low-concentration uranium-containing wastewater. The invention belongs to the field of functional materials and the field of purification of radioactive waste water. Background technique [0002] The discharge of uranium-containing wastewater during uranium mining, metallurgy and processing, the normal discharge of radioactive waste from nuclear power plants and the leakage of abnormal accidents, the production and testing of nuclear weapons, and the use of depleted uranium weapons in wars will all produce uranium-containing wastewater. Water pollution caused by uranium-containing wastewater poses a serious threat to the health and safety of humans and other organisms. Adsorption technology has played an important role in the field of urani...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/28B01J20/24B01J20/30C02F1/28C02F101/00C02F101/20
CPCB01J20/28047B01J20/24B01J20/22C02F1/286C02F2101/006C02F2101/20
Inventor 王红强王清良刘雯洁刘永陈凤鸣梁坤倩胡鄂明雷治武吕俊文张晓文
Owner NANHUA UNIV
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