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A kind of chitosan-based metal ion adsorbent and preparation method thereof

An ion adsorbent, chitosan technology, applied in the directions of alkali metal compounds, chemical instruments and methods, adsorbed water/sewage treatment, etc. and other problems, to achieve the effect of increasing adsorption active points and adsorption area, low production cost and increasing density

Inactive Publication Date: 2020-04-14
HUANGHUAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The literature reports on the preparation of some acid-modified chitosan adsorbents and the research results on the adsorption properties of heavy metal ions show that introducing some acids into chitosan can effectively change the chelation adsorption of chitosan to heavy metal ions. capacity, but this process requires the use of a large amount of acid, and the resulting heavy metal chelate remains in large quantities in the water body and cannot be separated by simple sedimentation, which affects the discharge and reuse of treated sewage to a certain extent
Rarely seen in the prior art chitosan-based metal ion adsorbent similar to the present invention

Method used

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  • A kind of chitosan-based metal ion adsorbent and preparation method thereof

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Effect test

Embodiment 1

[0026] The chitosan-based metal ion adsorbent of the present embodiment is prepared by the following method:

[0027] 1) Disperse 3g of RNS-A in 80mL of absolute ethanol, then add 3g of citric acid, stir and react at 30°C for 2h, cool, filter with suction, wash the filter cake with absolute ethanol, and dry it in vacuum at 35°C for 3h to obtain White powdery solid, i.e. RNS-A modification of citric acid as modified citric acid;

[0028] 2) Disperse 2g of chitosan in 50mL of isopropanol, stir for 30min, add 2g of citric acid modified RNS-A and 0.5g of 1-ethyl-(3-dimethylaminopropyl)carbodiethylene Amine, stirred and reacted at 50°C for 6h, cooled, suction filtered, the filter cake was washed with isopropanol and acetone respectively, and dried in vacuum at 45°C for 5h to obtain milky white particles, namely RNS as chitosan-based metal ion adsorbent -A modified citric acid grafted chitosan.

[0029] Raw materials and product characterization:

[0030] Use infrared spectroscop...

Embodiment 2

[0035] The chitosan-based metal ion adsorbent of the present embodiment is prepared by the following method:

[0036] 1) Disperse 3g of RNS-A in 80mL of absolute ethanol, then add 2g of citric acid, stir and react at 25°C for 3h, cool, filter with suction, wash the filter cake with absolute ethanol, and dry it in vacuum at 30°C for 4h to obtain White powdery solid, i.e. RNS-A modification of citric acid as modified citric acid;

[0037] 2) Disperse 2g of chitosan in 40mL of isopropanol, stir for 30min, add 1g of citric acid modified RNS-A and 0.3g of 1-ethyl-(3-dimethylaminopropyl)carbodiene imine, stirred and reacted at 45°C for 7h, cooled, suction filtered, and the filter cake was washed with isopropanol and acetone respectively, and dried in vacuum at 40°C for 6h to obtain milky white particles, which were used as chitosan-based metal ion adsorbents. RNS-A modified citric acid grafted chitosan.

Embodiment 3

[0039] The chitosan-based metal ion adsorbent of the present embodiment is prepared by the following method:

[0040] 1) Disperse 3g of RNS-A in 80mL of absolute ethanol, then add 4g of citric acid, stir and react at 35°C for 1h, cool, filter with suction, wash the filter cake with absolute ethanol, and dry it in vacuum at 40°C for 2h to obtain White powdery solid, i.e. RNS-A modification of citric acid as modified citric acid;

[0041] 2) Disperse 2g of chitosan in 60mL of isopropanol, stir for 30min, add 3g of RNS-A modification of citric acid and 1g of 1-ethyl-(3-dimethylaminopropyl)carbodiethylene amine, stirred and reacted at 55°C for 5h, cooled, suction filtered, the filter cake was washed with isopropanol and propanol respectively, and dried in vacuum at 50°C for 4h to obtain milky white particles, which were used as chitosan-based metal ion adsorbents. RNS-A modified citric acid grafted chitosan.

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Abstract

The invention relates to a chitosan-based metal ion adsorbent as well as a preparation method and application thereof. The preparation method of the chitosan-based metal ion adsorbent comprises the steps: 1) dispersing amino surface modified SiO2 nano-powder into low-molecule alcohol, and adding citric acid for reaction, so as to prepare modified citric acid; 2) dispersing chitosan and an activator into low-molecule alcohol, and adding the modified citric acid obtained in the step 1) for reaction, thereby obtaining the chitosan-based metal ion adsorbent. According to the chitosan-based metal ion adsorbent provided by the invention, the citric acid and the amino surface modified SiO2 are introduced into a chitosan structure, so that the number of heavy-metal adsorption active sites of the adsorbent is increased, the adsorption capacity of heavy-metal ions is further enhanced; an adsorption product is easily separated from water through settlement and can be directly and effectively applied to sewage treatment.

Description

technical field [0001] The invention belongs to the field of adsorption treatment of heavy metal ions, and in particular relates to a chitosan-based metal ion adsorbent and a preparation method and application thereof. Background technique [0002] While the acceleration of industrialization is promoting social and economic development, the heavy metal pollution it brings is increasingly disturbing human life. As a polysaccharide natural polymer containing amino groups, chitosan has a strong chelating ability for heavy metal ions, but its application in the adsorption of heavy metal ions is limited due to its poor water solubility, slow sedimentation speed, and small adsorption capacity. . In order to improve the application performance of chitosan in the adsorption of heavy metal ions, it is often chemically modified to introduce functional groups. [0003] The literature reports on the preparation of some acid-modified chitosan adsorbents and the research results on the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F101/20
Inventor 闫凤美喻淼张敬华赵艳玲孙楠董江红张向飞王会凤
Owner HUANGHUAI UNIV
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