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Preparation method of magnetic chitosan adsorbent

A technology of adsorbent and chitosan, which is applied in the field of preparation and application of magnetic chitosan composite materials, achieves the effect of simple preparation method, low equipment requirements and saving separation cost

Inactive Publication Date: 2018-05-18
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The key technical problem to be solved by the present invention is: firstly prepare the nano-magnetic core by hydrothermal method, then carry out silicon dioxide coating on the magnetic core by the method of hydrolysis of ethyl orthosilicate, and finally select the appropriate dosage of raw materials, so that The magnetic core is evenly distributed inside the chitosan gel network structure, and the preparation method is simple, the adsorption performance of Cr(VI) pollutants is good, and the high-dispersion and high-efficiency magnetic chitosan can be easily separated from the water after adsorption and can be regenerated and recycled. Sugar Adsorbent Composite

Method used

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  • Preparation method of magnetic chitosan adsorbent
  • Preparation method of magnetic chitosan adsorbent
  • Preparation method of magnetic chitosan adsorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Dissolve 2.7g of ferric chloride hexahydrate in 80mL of ethylene glycol (analytical grade), stir until the solution is clear and transparent, add 7.2g of anhydrous sodium acetate, and continue stirring until it dissolves; React for 15 hours; after the reaction is completed, remove the supernatant, wash with absolute ethanol and deionized water for 2-3 times after magnetic nuclear magnetic separation, and vacuum dry at 60° C. for 12 hours.

[0035] Add 0.2g of magnetic nuclei prepared by the above steps into a mixture of 60mL of absolute ethanol and 80mL of deionized water, and sonicate for 10min until the magnetic nuclei are evenly dispersed; add 1140μL of ammonia water and 0.28g of CTAB into the above liquid, and stir for 30min; 400 μL of hexyl orthosilicate (analytical grade), stirred for 5 hours; the resulting black solid was separated by magnetic force, washed and dried in vacuum at 60°C for 12 hours.

[0036] At room temperature, disperse 0.2g of silica-coated magn...

Embodiment 2

[0039] Dissolve 2.7g of ferric chloride hexahydrate in 80mL of ethylene glycol (analytical grade), stir until the solution is clear and transparent, add 7.2g of anhydrous sodium acetate, and continue stirring until it dissolves; React for 16 hours; after the reaction is completed, remove the supernatant, wash with absolute ethanol and deionized water for 2-3 times after magnetic nuclear magnetic separation, and vacuum dry at 60° C. for 12 hours.

[0040] Add 0.2g of magnetic nuclei to a mixture of 60mL of absolute ethanol and 80mL of deionized water, sonicate for 10min until the magnetic nuclei are evenly dispersed; add 1140μL of ammonia water and 0.28g of cetyltrimethylammonium bromide to the above liquid, and stir for 30min ; Add 400 μL hexyl orthosilicate solution (analytical grade) dropwise, stir for 5.5 hours and then magnetically separate the resulting black solid, wash with absolute ethanol and deionized water for 2-3 times, and then vacuum-dry at 60°C for 12 hours.

[...

Embodiment 3

[0044] Dissolve 2.7g of ferric chloride hexahydrate in 80mL of ethylene glycol (analytical grade), stir until the solution is clear and transparent, add 7.2g of anhydrous sodium acetate, and continue stirring until it dissolves; React for 17 hours; after the reaction is completed, remove the supernatant, wash with absolute ethanol and deionized water for 2-3 times after magnetic nuclear magnetic separation, and vacuum dry at 60° C. for 12 hours.

[0045] Add 0.2g of magnetic nuclei to a mixture of 60mL of absolute ethanol and 80mL of deionized water, sonicate for 10min until the magnetic nuclei are evenly dispersed; add 1140μL of ammonia water and 0.28g of cetyltrimethylammonium bromide to the above liquid, and stir for 30min ; Add 400 μL of hexyl orthosilicate solution (analytical grade) dropwise, stir for 6 hours, and magnetically separate the obtained black solid, wash with absolute ethanol and deionized water for 2-3 times, and then vacuum-dry at 60°C for 12 hours.

[0046...

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Abstract

The invention relates to a preparation method of a magnetic chitosan adsorbent. The preparation method specifically comprises steps as follows: firstly, magnetic Fe3O4 nanoparticles are prepared witha hydrothermal method; the surfaces of the Fe3O4 nanoparticles are coated with SiO2 with a tetraethoxysilane hydrolysis method, and a compound magnetic carrier Fe3O4@SiO2 is prepared; finally, a magnetic core is coated with a chitosan crosslinking method, and a magnetic Fe3O4@SiO2-CS composite, namely, a high-adsorption magnetic chitosan adsorbent is prepared. The method is simple and has low requirements for equipment, and the prepared adsorbent has higher removal rate and higher adsorption capacity for toxic Cr(VI) in water and has the removal rate reaching 99.6% and the adsorption capacityreaching 49.8 mg / g for a 50 mg / L Cr(VI) solution; the adsorbent has the maximum adsorption capacity reaching 82% for a 800 mg / L Cr(VI) solution; besides, the adsorbent adsorbing Cr(VI) can be separated from water through an external magnetic field, the problem of complicated separation and recovery process of a powdery adsorbent is effectively solved, and the separation efficiency is greatly improved.

Description

technical field [0001] The present invention relates to magnetic chitosan (Fe 3 o 4 @SiO 2 -CS) The technical field of composite material preparation and application, specifically a kind of preparation method for the magnetic chitosan adsorbent of high dispersion, high adsorption capacity that is used for highly toxic pollutant Cr (VI) adsorption. Background technique [0002] With the rapid development of today's industry, the discharge of heavy metal pollutants such as arsenic, chromium, cadmium, lead, and chromium is increasing day by day, which has caused great harm to human health and the living environment. Among them, Cr(VI) is listed as one of the most harmful chemical substances to the human body because of its high teratogenicity, carcinogenicity and mutagenicity. Nowadays, mining, paint, electroplating, metallurgy and other industries will produce chromium, and it is difficult to process and recover chromium ions after they enter the water body. Therefore, it ...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F101/22
CPCB01J20/24B01J20/06B01J20/103B01J20/28009B01J20/28047C02F1/281C02F1/285C02F1/286C02F2101/22
Inventor 蔡卫权姜易虹
Owner WUHAN UNIV OF TECH
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