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Acid-resistant magnetic chitosan microspheres as well as preparation method and application thereof

A technology of chitosan microspheres and acid resistance, which is applied in chemical instruments and methods, other chemical processes, alkali metal oxides/hydroxides, etc., to achieve the effect of improving acid resistance and strong acid resistance

Inactive Publication Date: 2015-03-25
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Currently, acid-resistant Fe 3 o 4 SiO 2 Chitosan and Fe 3 o 4 SiO 2 Chitosan-PEI microspheres have not been reported at home and abroad as an adsorbent for removing Cr(VI)

Method used

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  • Acid-resistant magnetic chitosan microspheres as well as preparation method and application thereof
  • Acid-resistant magnetic chitosan microspheres as well as preparation method and application thereof
  • Acid-resistant magnetic chitosan microspheres as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] The preparation of magnetic chitosan microspheres, the preparation steps are:

[0056] Add 10mmol ferric trichloride and 5mmol ferric dichloride to a stirred reactor filled with 100mL distilled water, raise the temperature to 60°C under the protection of nitrogen, then add 25mL concentrated ammonia water under high-speed stirring conditions, and the solution will turn black quickly Add 0.2mmol sodium citrate and continue the constant temperature reaction for 20min. The product was separated and recovered with a magnet, washed several times with deionized water and stored in water.

[0057] Take 0.1g of citric acid modified Fe 3 o 4 Nanoparticles were ultrasonically dispersed into a mixed solution consisting of 40mL ethanol and 1.2mL concentrated ammonia water. Under continuous mechanical stirring, 0.4mL tetraethyl orthosilicate was slowly added, and the reaction was stirred at room temperature for 12h. After the reaction, it was magnetically separated, washed repeate...

Embodiment 2

[0060] The preparation of magnetic chitosan microspheres, the preparation steps are:

[0061]Add 50mmol ferric trichloride and 25mmol ferric dichloride to a stirred reactor filled with 100mL distilled water, raise the temperature to 90°C under the protection of nitrogen, then add 25mL concentrated ammonia water under high-speed stirring conditions, and the solution will turn black quickly 2mmol sodium citrate was added, and the constant temperature reaction was continued for 60min. The product was separated and recovered with a magnet, washed several times with deionized water and stored in water.

[0062] Take 0.1g of citric acid modified Fe 3 o 4 Nanoparticles were ultrasonically dispersed into a mixed solution consisting of 80mL ethanol and 2.4mL concentrated ammonia water. Under continuous mechanical stirring, 0.8mL tetraethyl orthosilicate was slowly added, and the reaction was stirred at room temperature for 24h. After the reaction, it was magnetically separated, wash...

Embodiment 3

[0065] The preparation of magnetic chitosan microspheres, the preparation steps are:

[0066] Add 10mmol ferric trichloride and 5mmol ferric dichloride to a stirred reactor filled with 100mL distilled water, raise the temperature to 60°C under the protection of nitrogen, then add 25mL concentrated ammonia water under high-speed stirring conditions, and the solution will turn black quickly Add 0.2mmol sodium citrate and continue the constant temperature reaction for 20min. The product was separated and recovered with a magnet, washed several times with deionized water and stored in water.

[0067] Take 0.1g of citric acid modified Fe 3 o 4 Nanoparticles were ultrasonically dispersed into 50mL aqueous solution containing 0.475g sodium silicate, the temperature of the solution was raised to 85°C, and under high-speed stirring conditions, hydrochloric acid with a concentration of 2mol / L was added dropwise to the solution, and the pH value of the solution changed from alkali to ...

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Abstract

The invention relates to an acid-resistant magnetic chitosan microsphere adsorbent as well as a preparation method and the application thereof, and in particular relates to acid-resistant magnetic chitosan microspheres which have the excellent absorption performance and recycling performance for acid waste water containing hexavalent chromium, a preparation method of the acid-resistant magnetic chitosan microspheres and the application of the acid-resistant magnetic chitosan microspheres. The preparation method of the acid-resistant magnetic chitosan microspheres comprises the following steps: (1) preparing Fe3O4 nano-particles modified by citric acid by using a coprecipitation method; (2) preparing single-coated magnetic SiO2 nano-particles by using a sodium silicate hydrolysis method or a sol-gel method; and (3) preparing the chitosan microspheres coated with magnetic SiO2 by taking chitosan powder as a raw material by adopting an emulsion crosslinking method. Furthermore, in order to further improve the adsorbing capacity of the microspheres, in the method, dendritic polyethylene imine is taken as a functional group for modifying the adsorbent, so that the modified chitosan microspheres can be obtained. The magnetic chitosan microspheres prepared by adopting the method not only have the excellent acid resistance, but also have the good absorption performance on Cr (VI) ions.

Description

technical field [0001] The invention belongs to the field of water treatment, and relates to an acid-resistant magnetic chitosan microsphere adsorbent, a preparation method and its application, in particular to an acid-resistant magnetic chitosan microsphere with excellent adsorption performance and reusability for hexavalent chromium acid wastewater. Chitosan microspheres, preparation method and application thereof. Background technique [0002] Chromium salt, electroplating, metal smelting and tanning industries discharge a large amount of chromium-containing wastewater every year, of which the electroplating industry alone discharges 4 billion m 3 / a. Chromium exists mainly in two forms of Cr(III) and Cr(VI) in water bodies, among which Cr(VI) is 100 times more toxic than Cr(III), and belongs to the first class of pollutants, and the discharge of Cr(VI) is stipulated by the state The standard is only 0.5mg / L, which has great significance for its treatment. [0003] The...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F1/62
CPCB01J20/24B01J20/06B01J20/103B01J20/28009B01J20/28019C02F1/281C02F1/286C02F1/288C02F2101/22
Inventor 刘会洲孙西同杨良嵘
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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