Calcium ion imprinted chitosan adsorbent, and preparation method and applications thereof

A technology of chitosan and calcium ions, which is applied in the field of calcium ion template imprinted chitosan adsorbent and its preparation, can solve the problems of low selectivity, low mechanical strength, and complicated preparation process, and achieve high adsorption capacity and good mechanical properties. Strength, good adsorption effect

Inactive Publication Date: 2019-08-06
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In order to solve the shortcomings of the existing chitosan adsorbents such as complex preparation process, low selectivity and low mechanical strength, the purpose of the present invention is to provide a modified chitosan with simple synthesis method, high selectivity and reusability Adsorbent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The calcium ion imprinted chitosan adsorbent that embodiment 1 provides, its preparation method, comprises the steps:

[0042] (1) 1g chitosan (the degree of deacetylation of chitosan is 85%) is added in 70mL mass percent concentration and is 2% acetic acid solution, stirs 30min and makes chitosan dissolve completely, stirs evenly, obtains chitosan solution;

[0043] (2) 1.0mL acrylic acid, 0.2g calcium chloride dihydrate and 0.2g initiator (potassium persulfate) are added to the chitosan solution described in step (1), heated and stirred under a nitrogen atmosphere, and heated and stirred The temperature is 60 degrees Celsius, the stirring speed of heating and stirring treatment is 600rpm, the time of heating and stirring treatment is 3 hours, and the mixed solution is obtained;

[0044] (3) Add 1.0 mL of glutaraldehyde solution with a mass percentage concentration of 25% to the mixed solution (2) described in step (2) (the mixed solution is measured, the volume here i...

Embodiment 2

[0050] The calcium ion imprinted chitosan adsorbent that embodiment 2 provides, its preparation method, comprises the steps:

[0051] (1) 1g chitosan (the degree of deacetylation of chitosan is 87%) is added in 80mL mass percent concentration and is 3% acetic acid solution, stirs 30min and makes chitosan dissolve completely, stirs evenly, obtains chitosan solution;

[0052] (2) 1.5mL acrylic acid, 0.215g calcium chloride dihydrate and 0.2g initiator (potassium persulfate) are added to the chitosan solution described in step (1), heated and stirred under a nitrogen atmosphere, and heated and stirred The temperature is 50 degrees centigrade, the stirring rate of heating and stirring treatment is 800rpm, the time of heating and stirring treatment is 2.5 hours, and the mixed solution is obtained;

[0053] (3) Add 1.5mL of 25% glutaraldehyde solution by mass to the mixed solution described in step (2) (the mixed solution is measured, the volume here is 70mL), mix evenly, heat treat...

Embodiment 3

[0059] The calcium ion imprinted chitosan adsorbent that embodiment 3 provides, its preparation method, comprises the steps:

[0060] (1) 1g of chitosan (the degree of deacetylation of chitosan is 90%) is added into 100mL of acetic acid solution with a concentration of 4% by mass, stirred for 30min to completely dissolve chitosan, and stirred evenly to obtain a chitosan solution ;

[0061] (2) 1.5mL acrylic acid, 0.25g calcium chloride dihydrate and 0.2g initiator (potassium persulfate) are added to the chitosan solution described in step (1), heated and stirred under a nitrogen atmosphere, and heated and stirred The temperature is 60 degrees Celsius, the stirring speed of heating and stirring treatment is 1300rpm, the time of heating and stirring treatment is 2 hours, and the mixed solution is obtained;

[0062] (3) Add 2.0mL of glutaraldehyde solution with a concentration of 25% by mass to the mixed solution in step (2) (the mixed solution is measured, the volume here is 70...

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Abstract

The invention discloses a calcium ion imprinted chitosan adsorbent, and a preparation method and applications thereof. The method includes adding chitosan into an acetic acid solution to obtain a chitosan solution through uniform mixing; adding acrylic acid, a template agent and an initiator into the chitosan solution, and performing heating stirring under the protective atmosphere so that a mixedliquor can be obtained; adding a glutaraldehyde solution into the mixed liquor, and performing uniform mixing, heating treatment, centrifugation and sediment taking, washing and drying; and performing elution treatment on the sediment so that the calcium ion imprinted chitosan adsorbent can be obtained. The method prepares the modified chitosan nano adsorbent with strong mechanical strength and good adsorption performance by taking calcium ions as a template, taking glutaraldehyde as a cross-linking agent and taking acrylic acid as a grafting agent. The provided imprinted chitosan adsorbent has advantages of being simple in preparation, uniform in particle sizes of the adsorbent, large in specific surface area, good in adsorption effect and strong in target ion selectivity, and can be desorbed, regenerated and reused; and the imprinted chitosan adsorbent can effectively realize the removing of heavy metal ions.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and relates to a calcium ion template imprinted chitosan adsorbent, a preparation method and application thereof. Background technique [0002] With the development of modern industrial and agricultural modernization and urbanization, heavy metal pollution has become very prominent. At present, a large number of technologies have been applied to study the removal of heavy metal ions in water. Common treatment methods include chemical precipitation, ion exchange, electrochemical and adsorption. Among these technologies, the adsorption method has been considered as one of the most commonly used methods due to its advantages of simple operation, high efficiency, easy recovery, regenerability, and sludge-free operation. [0003] Some researchers have attempted to develop well-performing adsorbents for handling heavy metal ions. Among these adsorbents, activated carbon is considered to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30B01J20/34C02F1/28C02F101/20
CPCB01J20/22B01J20/24B01J20/28004B01J20/28011B01J20/3057B01J20/345C02F1/286C02F2101/20
Inventor 葛华才杜娟李娜
Owner SOUTH CHINA UNIV OF TECH
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