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Method for preparing adsorbent recombination chitosan micro-sphere crosslinked resin

A technology of chitosan microspheres and cross-linked resins, applied in chemical instruments and methods, adsorption water/sewage treatment, and other chemical processes, can solve the problems of unsatisfactory water resistance and acid resistance, difficulties in adsorption separation and regeneration, Solve the problems of slow adsorption rate and achieve the effect of stable water resistance, fast adsorption rate and high selectivity

Inactive Publication Date: 2008-07-09
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While the obtained composite adsorbent has brought into play the inherent characteristics of various porous solid adsorbents, it also overcomes the shortcomings of slow adsorption rate and poor mechanical properties of pure chitosan solid adsorbents, but the water resistance and acid resistance are still not ideal. And there are disadvantages such as adsorption separation and regeneration difficulties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) Carry out a cross-linking. Disperse span-80 in liquid paraffin under stirring at room temperature, add dilute chitosan solution (containing 1-5% ethyl acetate, 0.5-5% chitosan and 1-5% acetic acid), and then add activated carbon powder , stirring and reacting until uniform and stable composite microspheres are formed in the mixed solution, add formaldehyde, heat up to 40-65°C for cross-linking reaction for 0.5-1.5 hours, collect the cross-linking composite microsphere resin by filtration, wash with water until neutral, and use petroleum ether Extract, wash with ethanol to remove residual organic matter in the composite microspheres, and dry to obtain the formaldehyde cross-linked resin product of activated carbon composite chitosan microspheres;

[0016] (2) Perform secondary cross-linking. After the cross-linking reaction as described in (1), adjust the pH of the reaction system to 9.5-10.5, add epichlorohydrin, raise the temperature to 55-75°C to continue the cro...

Embodiment 2

[0020] (1) Carry out a cross-linking. Disperse span-85 and span-40 in liquid paraffin under stirring at room temperature, add dilute chitosan solution (containing 1-5% ethanol, 0.5-5% chitosan and 1-5% acetic acid), and then add Alumina powder, stir and react until uniform and stable composite microspheres are formed in the mixture, then add glutaraldehyde, heat up to 40-65°C for cross-linking reaction for 0.5-1.5h;

[0021] (2) Perform secondary cross-linking. After the cross-linking reaction described in (1), adjust the pH of the reaction system to 9.5-10.5 with lye, raise the temperature to 55-75°C to continue the cross-linking reaction for 1.5-3.0 hours, collect the cross-linked composite microsphere resin by filtration, and wash with water until Neutral, extract with petroleum ether, wash with ethanol to remove residual organic matter in the composite microspheres, and dry to obtain a glutaraldehyde crosslinked resin product of alumina composite chitosan microspheres;

...

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Abstract

The invention relates to a process for preparing an adsorbent, namely composite chitosan microsphere crosslinking resin of adsorbent, which belongs to the preparing field of adsorption resin in the water treatment adsorption technology. The invention is characterized in that hole solid adsorbent and chitosan are utilized to be the main raw material, and cross linker is utilized to be auxiliary raw material, the invention is prepared by the process of utilizing hole preparing agent to make holes, primary or secondary cross bonding, hydrolysis or non-hydrolysis, deacidizing or no deacidizing under the basis of utilizing solid adsorbent to load chitosan solution. The innvention has the advantages that the products of composite chitosan microsphere crosslinking resin of adsorbent are not only applicable to the field of water treatment, but also can be applied in the filed of textile, printing, food, medicine, cosmetic, fruit fresh-keeping and the like. And the invention also has the advantages of excellent mechanical property, stable water resistance property, high adsorption capacity, fast adsorption rate and high selectivity.

Description

technical field [0001] The invention belongs to the field of adsorption resin preparation in water treatment adsorption technology, and relates to a preparation method of cross-linked adsorption resin for water treatment, in particular to a porous solid adsorbent and chitosan as main raw materials, cross-linking agent as auxiliary Raw materials, on the basis of solid adsorbent loaded chitosan solution, prepare adsorbent composite chitosan microsphere cross-linked resin by pore forming, secondary crosslinking, hydrolysis or non-hydrolysis, reduction or non-reduction method Methods. Background technique [0002] The amino groups and hydroxyl groups in chitosan molecules can produce many pollutants in water (such as heavy metals, dyes, proteins, amino acids, nucleic acids, enzymes, halogens, anions, etc.) through chelation, complexation, ion exchange, and electrical neutralization. Adsorption. However, when pure chitosan is used as a solid adsorbent, the adsorption rate is sl...

Claims

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Application Information

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IPC IPC(8): C08J3/12C08J3/24C08L5/08B01J20/24C08K3/00C02F1/28
Inventor 张爱丽周集体金若菲
Owner DALIAN UNIV OF TECH
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