Method for preparing magnetic chitosan adsorbent through Fe3O4/chitosan coprecipitation

A chitosan and adsorbent technology, applied in the field of preparation of magnetic chitosan, can solve the problems of difficult separation, reduce the adsorption capacity of chitosan, etc., and achieve stable chemical properties, good recycling regeneration adsorption performance, and mild reaction conditions. Effect

Inactive Publication Date: 2017-05-31
WUHAN UNIV OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

CN101973618A discloses a preparation method of a chitosan-iron complex adsorbent, which comprises dissolving the chitosan monomer in an aqueous solution of ferric chloride, adding ethanol to separate out the solid after it is mixed evenly, and filtering and washing it with ammonium Dialdehyde aqueous solution carries out cross-l

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  • Method for preparing magnetic chitosan adsorbent through Fe3O4/chitosan coprecipitation
  • Method for preparing magnetic chitosan adsorbent through Fe3O4/chitosan coprecipitation
  • Method for preparing magnetic chitosan adsorbent through Fe3O4/chitosan coprecipitation

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Embodiment 1

[0034] 1mmol FeCl 3 ·6H 2 After O was dissolved in 50ml of deionized water, 1g of chitosan was added and stirred at room temperature for 2h; then 1mmol of FeCl was added 2 4H 2 O, continue stirring for 2h; then slowly add 100ml, a mass fraction of 99.5% absolute ethanol and 10ml, a mass fraction of 25% ammonia water for precipitation; After washing with absolute ethanol, after repeating three times, the product was dried under vacuum conditions at 60° C. for 12 h; Carry out cross-linking in a mixed solution of water and ethanol, stir at room temperature for 2 hours; then undergo magnetic separation and wash with absolute ethanol with a mass fraction of 99.5%, repeat three times, and then dry the obtained product under vacuum at 60°C for 12 hours , to obtain magnetic chitosan.

[0035] When adsorbing 100ml, 200mg / L of Cr(VI) solution, adjust its pH to 2 with a hydrochloric acid solution with a concentration of 0.1mol / L, then add 0.1g of magnetic chitosan sample, and set the...

Embodiment 2

[0038] 1mmol FeCl 3 ·6H 2 After O was dissolved in 50ml of deionized water, 1g of chitosan was added and stirred at room temperature for 2h; then 0.5mmol of FeCl was added 2 4H 2 O, continue stirring for 2h; then slowly add 100ml, a mass fraction of 99.5% absolute ethanol and 10ml, a mass fraction of 25% ammonia water for precipitation; Washing with absolute ethanol was repeated three times, and the product was dried under vacuum at 60°C for 12 hours; after grinding the obtained product, it was dispersed into 10ml of glutaraldehyde with a volume fraction of 25% and 40ml of anhydrous Carry out cross-linking in a mixed solution of ethanol, stir at room temperature for 2 h; then undergo magnetic separation and wash with absolute ethanol with a mass fraction of 99.5%, repeat three times, and then dry the obtained product under vacuum at 60°C for 12 h, namely Obtain magnetic chitosan.

[0039] When absorbing 100ml, 200mg / L Cr(VI) solution, adjust the pH to 2 with a hydrochloric...

Embodiment 3

[0042] 2mmol FeCl 3 ·6H 2 After O was dissolved in 50ml of deionized water, 1g of chitosan was added and stirred at room temperature for 2h; then 0.5mmol of FeCl was added 2 4H 2 O, continue to stir for 2h; then slowly add 100ml, a mixed solution of absolute ethanol with a mass fraction of 99.5% and 10ml, a mixed solution of ammonia with a mass fraction of 25% for precipitation; the obtained precipitate is magnetically separated with a concentration and mass fraction of 99.5% Washing with absolute ethanol, repeated three times, then the product obtained was dried under vacuum conditions at 60°C for 12h; after the product obtained was ground, it was dispersed into 10ml of glutaraldehyde with a volume fraction of 25% and 40ml with a mass fraction of Carry out cross-linking in a mixed solution of 99.5% absolute ethanol, stir at room temperature for 2 hours; then undergo magnetic separation and wash with 99.5% absolute ethanol, repeat three times, and then vacuum-dry the obtaine...

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Abstract

The invention discloses a method for preparing a magnetic chitosan adsorbent through Fe3O4/chitosan coprecipitation. The method specifically comprises the following steps: sufficiently dissolving chitosan in a FeCl3.6H2O solution, and then adding a certain amount of FeCl2.4H2O powder; after being completely dissolved, dropwisely adding an ethanol and ammonia water mixed solution, precipitating, performing magnetic separation, and drying; and grinding the obtained product, dispersing into an ethanol and glutaric dialdehyde mixed solution, crosslinking, performing further magnetic separation, and drying to obtain the magnetic chitosan adsorbent powder. The method is simple in preparation process, ammonia water/ethanol is used as precipitant to realize synchronous generation of Fe3O4/chitosan, and magnetic property of Fe3O4 and adsorption sites of exposed chitosan are fully utilized. The prepared Fe3O4/chitosan has excellent adsorptive property for toxic Cr(VI) heavy metal pollutants and can be easily separated, and the Fe3O4/chitosan can also be regenerated and recycled after Cr(VI) desorption; and the Fe3O4/chitosan has favorable competitive adsorption selectivity for Cr(VI) in a Cr(VI)/Mg(II)/Zn(II)/Ni(II)/Cd(II)/Cu(II) mixed solution.

Description

technical field [0001] The invention relates to the technical field of preparation and application of magnetic chitosan, in particular to a preparation method and application of magnetic chitosan for adsorption of highly toxic pollutant Cr(VI). Background technique [0002] In recent years, with the continuous acceleration of my country's industrialization, more and more industries are involved in heavy metal emissions, coupled with the illegal mining of some polluting enterprises, excessive sewage discharge and other prominent problems, resulting in a high incidence of heavy metal pollution incidents, especially the hazards of chromium . Chromium mainly exists in two valence states of Cr(VI) and Cr(III), and Cr(VI) and Cr(III) can be transformed into each other, among which Cr(III) is the most stable, mainly in the water body as Cr(OH ) 2+ Exist in the form of Cr(VI) in water mainly as CrO 4 2+ 、Cr 2 o 7 2- and HCrO 4 3- Plasma form exists. Most of the toxicity of ...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F101/22
Inventor 蔡卫权薛文惠
Owner WUHAN UNIV OF TECH
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