Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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: 2018-01-16
HUANGHUAI UNIV
View PDF3 Cites 6 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Chitosan-based metal ion adsorbent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0027] 1) Disperse 3g RNS-A in 80mL of absolute ethanol, then add 3g of citric acid, stir the reaction at 30℃ for 2h, cool, filter with suction, wash the filter cake with absolute ethanol, and dry it in vacuum at 35℃ for 3h to obtain White powdery solid, that is, the 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 RNS-A modified citric acid and 0.5g of 1-ethyl-(3-dimethylaminopropyl) carbodisulfide Amine, stirred and reacted at 50℃ for 6h, cooled, filtered with suction, the filter cake was washed with isopropanol and acetone, and dried in vacuum at 45℃ for 5h to obtain milky white particles, namely RNS as a chitosan-based metal ion adsorbent -A modified chitosan grafted with citric acid.

[0029] Raw material and product characterization:

[0030] Use infrared spectroscopy to character...

Embodiment 2

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

[0036] 1) Disperse 3g RNS-A in 80mL of absolute ethanol, then add 2g of citric acid, stir the reaction at 25℃ for 3h, cool and filter with suction. After the filter cake is washed with absolute ethanol, it is vacuum dried at 30℃ for 4h to obtain White powdery solid, that is, the 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 RNS-A modified citric acid and 0.3g of 1-ethyl-(3-dimethylaminopropyl) carbon dioxide Imine, stirred and reacted at 45℃ for 7h, cooled, filtered with suction, the filter cake was washed with isopropanol and acetone, and dried in vacuum at 40℃ for 6h to obtain milky white particles, which are used as chitosan-based metal ion adsorbents RNS-A modified citric acid grafted chitosan.

Embodiment 3

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

[0040] 1) Disperse 3g RNS-A in 80mL absolute ethanol, then add 4g citric acid, stir the reaction at 35℃ for 1h, cool, filter with suction, the filter cake is washed with absolute ethanol, and dried in vacuum at 40℃ for 2h to obtain White powdery solid, that is, the RNS-A modification of citric acid as modified citric acid;

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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 specifically relates to a chitosan-based metal ion adsorbent and a preparation method and application thereof. Background technique [0002] The acceleration of the process of industrialization promotes social and economic development, while the heavy metal pollution it brings is also increasingly disrupting human life. As a natural polymer of polysaccharides containing amino groups, chitosan has a strong chelating ability to heavy metal ions, but due to its poor water solubility, slow sedimentation rate, and small adsorption capacity, its application in heavy metal ion adsorption is limited. . 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] Literature reports on the preparation of some acid-modified chitosan adsorbents and their adsorption performance ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com