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Chitosan-based lead ion imprinted adsorbent and preparation method thereof

A technology of imprinting adsorption and chitosan, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve the problems of difficult separation of target metal ions, reduced CS adsorption capacity, lack of selectivity, etc. Achieve good adsorption and selectivity, improve stability, increase adsorption capacity and selectivity

Inactive Publication Date: 2020-07-28
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because ordinary CS is easily dissolved and lost in aqueous solution, especially in acidic aqueous solution, its application is greatly limited.
Its acid solubility can be improved by cross-linking modification, but because cross-linking consumes a large number of active groups such as amino groups, the adsorption capacity of CS after cross-linking is significantly reduced; at the same time, the adsorption capacity of natural polymer adsorption materials for heavy metal ions Generally lack of selectivity, it is very difficult to separate target metal ions in a targeted manner

Method used

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  • Chitosan-based lead ion imprinted adsorbent and preparation method thereof
  • Chitosan-based lead ion imprinted adsorbent and preparation method thereof
  • Chitosan-based lead ion imprinted adsorbent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Add 1.0g CS and 0.75g EDTA-2Na into 40mL 0.1M HCl solution, and magnetically stir until completely dissolved without bubbles to obtain a mixed solution;

[0030] (2) Use 1M NaOH solution to adjust the pH of the mixed solution in step (1) to 5.5, stir magnetically for 2 hours, dissolve 0.386g EDC·HCl in 10mL deionized water, add it to the mixed solution in an ice bath, and stir vigorously to make it Quickly mix evenly, ultrasonically degas for 10 minutes, and stand at 30°C for 10 hours to obtain EDTA-CS gel;

[0031] (3) Cut the EDTA-CS gel obtained in step (2) into 2×2×2mm pieces, disperse them in 50mL deionized water, add 300mg Pb 2+ , soaked for 4h, and then placed in 100mL 1.5wt% glutaraldehyde solution to cross-link the blot to obtain Pb 2+ Blot EDTA-CS gel;

[0032] (4) the Pb obtained in step (3)2+ Blot EDTA-CS gel in 50mL 0.5mol / L HCl, shake at 30°C for 30min to elute Pb 2+ , repeat the elution 6 times to remove imprinted Pb 2+ , and then washed with deio...

Embodiment 2

[0043] (1) Add 1.0g CS and 0.5g EDTA-2Na into 40mL 0.1M HCl solution, and magnetically stir until completely dissolved without bubbles to obtain a mixed solution;

[0044] (2) Use 1M NaOH solution to adjust the pH of the mixed solution in step (1) to 5.5, stir magnetically for 2 hours, dissolve 0.2575g EDC·HCl in 10mL deionized water, add it to the mixed solution in an ice bath, and stir vigorously to make it Quickly mix evenly, ultrasonically degas for 10 minutes, and stand at 30°C for 10 hours to obtain EDTA-CS gel;

[0045] (3) Cut the EDTA-CS gel obtained in step (2) into 2×2×2mm pieces, disperse them in 50mL deionized water, add 100mg Pb 2+ , soaked for 4h, and then placed in 100mL 0.5wt% glutaraldehyde solution to cross-link the blot to obtain Pb 2+ Blot EDTA-CS gel;

[0046] (4) the Pb obtained in step (3) 2+ Blot EDTA-CS gel in 50mL 0.5mol / L HCl, shake at 30°C for 30min to elute Pb 2+ , repeat the elution 6 times to remove imprinted Pb 2+ , and then washed with de...

Embodiment 3

[0048] (1) Add 1.0g CS and 1.0g EDTA-2Na into 40mL 0.1M HCl solution, and magnetically stir until completely dissolved without bubbles to obtain a mixed solution;

[0049] (2) Use 1M NaOH solution to adjust the pH of the mixed solution in step (1) to 5.5, stir magnetically for 2 hours, dissolve 0.2575g EDC·HCl in 10mL deionized water, add it to the mixed solution in an ice bath, and stir vigorously to make it Quickly mix evenly, ultrasonically degas for 10 minutes, and stand at 30°C for 10 hours to obtain EDTA-CS gel;

[0050] (3) Cut the EDTA-CS gel obtained in step (2) into 2×2×2mm pieces, disperse them in 50mL deionized water, add 200mg Pb 2+ , soaked for 4h, and then placed in 100mL 1.0wt% glutaraldehyde solution to cross-link the blot to obtain Pb 2+ Blot EDTA-CS gel;

[0051] (4) the Pb obtained in step (3) 2+ Blot EDTA-CS gel in 50mL 0.5mol / L HCl, shake at 30°C for 30min to elute Pb 2+ , repeat the elution 6 times to remove imprinted Pb 2+ , and then washed with de...

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Abstract

The invention belongs to the field of functional polymer adsorption materials and specifically relates to a chitosan-based lead ion imprinted adsorbent and a preparation method thereof. The preparation method comprises the following steps: dissolving CS and EDTA-2Na in diluted hydrochloric acid to prepare a mixed solution; adjusting the pH value of the solution to 5.5, adding EDC-HCl under an icebath condition for a reaction to obtain EDTA-CS gel, soaking and adsorbing the gel in a Pb<2+> solution, adding glutaraldehyde for cross-linking, then washing off Pb<2+> in the gel with an eluent, washing the gel with deionized water until the gel is neutral, and drying and crushing the gel to obtain the adsorbent. The adsorbent prepared by the method has good adsorbability and selectivity to Pb<2+>, can be recycled, uses harmless raw materials, and is simple in preparation process, friendly to environment and applicable to treatment of lead ion-containing wastewater.

Description

technical field [0001] The invention belongs to the field of functional polymer adsorption materials, relates to heavy metal pollution control technology, and more specifically relates to a chitosan-based lead ion imprinted adsorbent and a preparation method thereof. Background technique [0002] Lead is a heavy metal that exists widely in the environment. Untreated lead-containing wastewater is directly discharged into the water body, which will endanger the ecological environment of the water body. After entering the human body through food, etc., it is often accumulated in specific tissues and organs, damaging Bone marrow hematopoietic system, nervous system, digestive system and other important human body systems seriously endanger human health, especially children's health and intelligence. Therefore, the removal, recovery and detection of lead ions is very important. At present, the methods for removing heavy metal ions such as lead ions from wastewater mainly include...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F101/20
CPCB01J20/24B01J20/3085C02F1/286B01J2220/4825C02F2101/20
Inventor 张卫英崔康峰李晓宋鑫英晓光
Owner FUZHOU UNIV
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