Preparation of chitosan molecular imprinting adsorbing agent

A technology of molecular imprinting and chitosan, which is applied in chemical instruments and methods, adsorption water/sewage treatment, and other chemical processes, can solve the problem of reduced adsorption effect and achieve good adsorption specificity and selectivity.

Inactive Publication Date: 2008-11-05
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although conventional adsorbents also have a certain adsorption effect on PFOS, in complex water bodies, due to the interference of other pollutants, their adsorption effect is often greatly reduced, and molecularly imprinted adsorbents can just make up for the shortcomings of conventional adsorbents. Can selectively remove PFOS in water

Method used

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  • Preparation of chitosan molecular imprinting adsorbing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: Dissolve 1.5g of chitosan in 50ml of acetic acid solution (volume percentage 2%), and then drip into 200ml of sodium hydroxide (0.5M) solution for granulation after being completely dissolved, and obtain chitosan The pellets are about 36g, and after reacting with 1ml epichlorohydrin at 60°C for 12h, they are washed and stored in deionized water for later use. Take 9g of micro-crosslinked chitosan pellets and add it to 500mL potassium perfluorooctane sulfonate acidic aqueous solution (400mg / L) for 5h, and the pH value of the solution is always kept at about 4. After the blotting, the chitosan pellets were added to the epichlorohydrin solution and reacted at 60° C. for 12 hours. The epichlorohydrin solution contained 0.3 mL epichlorohydrin and 10 ml deionized water. Then, it was eluted with methanol / 0.5M potassium hydroxide solution for 1 hour to remove the template molecules, and finally washed repeatedly with deionized water, freeze-dried to constant weight, and ...

Embodiment 2

[0028] Example 2: Dissolve 3g of chitosan in 100ml of acetic acid solution (volume percentage 2%), and then drip into 400ml of sodium hydroxide (0.5M) solution to granulate after being completely dissolved. The ball is about 72g, reacted with 0.9ml epichlorohydrin at 40°C for 2h, then washed and stored in deionized water for later use. Take 4g of micro-crosslinked chitosan beads and add it to 125mL of potassium perfluorooctane sulfonate acidic aqueous solution (400mg / L) for 5h, and the pH value of the solution is always kept at about 4. After the blotting, the chitosan pellets were added to the epichlorohydrin solution and reacted at 60°C for 5 hours. The epichlorohydrin solution contained 0.15mL epichlorohydrin and 10ml deionized water. Then, it was eluted with acetone / 0.5M sodium hydroxide solution for 3 hours to remove the template molecules, and finally washed repeatedly with deionized water, freeze-dried to constant weight, and chitosan molecularly imprinted adsorbent was obt...

Embodiment 3

[0029] Example 3: Dissolve 3g of chitosan in 100ml of acetic acid solution (volume percentage 2%), after completely dissolved, drip into 500ml of sodium hydroxide (0.5M) solution to granulate, the obtained chitosan is small The ball is about 72g. After reacting with 2ml epichlorohydrin at 40°C for 12h, it is washed and stored in deionized water for later use. 3.36g micro-crosslinked chitosan beads were added to 125mL perfluorooctanesulfonic acid aqueous solution (500mg / L) and blotted for 13.5h. The pH value of the solution was always kept at about 4. After the blotting, the chitosan pellets were added to the epichlorohydrin solution and reacted at 40°C for 12 hours. The epichlorohydrin solution contained 0.4mL epichlorohydrin and 10ml deionized water. Then, it was eluted with methanol / 0.5M sodium hydroxide solution for 3 hours to remove the template molecules, and finally washed repeatedly with deionized water, freeze-dried to constant weight, and chitosan molecularly imprinted ad...

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Abstract

The invention provides a preparation method for a print adsorbent of chitosan molecules, which relates to a preparation method for an adsorbent that can selectively remove perfluorooctane sulfonate (PFOS) in water. The preparation method adopts a molecular imprinting technique to construct a plurality of specific adsorption sites and the worthy adsorbent has remarkable selectivity adsorption to the PFOS in water. The method takes chitosan as raw material to prepare micro-cross linking chitosan beads; then the chitosan beads are printed with template molecules PFOS for 5 to 24 hours in an acid water solution, a mass ratio between the template molecules and the micro-cross linking chitosan beads is 0.005 to 0.06: 1, and reaction with a cross linker is carried out for 2 to12 hours after printing; the mass ratio between the volume of the cross linker and the micro-cross linking chitosan beads after being printed is 0.0125 to 0.119ml / g; finally, an organic solvent is used for eluting for 1 to 8 hours and the print adsorbent of chitosan molecules is obtained after freeze-drying. The adsorbent is suitable for adsorbing and removing PFOS in complicated water substances and is characterized by strong selectivity and being able to be reused.

Description

Technical field [0001] The invention relates to a preparation method of a chitosan molecularly imprinted adsorbent. The adsorbent prepared by the method can selectively adsorb and remove perfluorooctane sulfonate compounds (PFOS) in complex water bodies, and belongs to water Dealing with the field of adsorption technology. Background technique [0002] Perfluorooctane sulfonate (PFOS) is an important class of perfluorinated compounds, which are widely used in many fields as surfactants, antifouling agents, fire extinguishing foams and chemical intermediates. At the same time, PFOS is also the final degradation product of many perfluorinated compounds. In recent years, more and more researchers have conducted research and reports on the refractory, bioaccumulation, endocrine disrupting, toxicity, and global distribution of PFOS. As a new candidate for persistent organic pollutants (POPs), PFOS has a maximum solubility of 570mg / L in water, which makes them more potentially harmful ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24C02F1/28
Inventor 邓述波余强余刚
Owner TSINGHUA UNIV
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