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A redox-responsive metal gel and chitosan composite magnetic microspheres, preparation method and application thereof

A technology of metal gel and composite magnetism, which is applied in the field of water treatment to achieve mild conditions, strong acid resistance and simple process

Inactive Publication Date: 2017-05-03
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] At present, the preparation of redox-responsive Cu(I) metal gel and chitosan composite magnetic microspheres has not been reported, which can be used as a new type of adsorbent for reduction adsorption treatment of Cr(VI) wastewater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Fe 3 o 4 @SiO 2 The preparation of @Gel-Chitosan microspheres, the preparation steps are:

[0062] 1 L 1mol / L CuCl 2 The methanol solution was added dropwise to an equal volume of 1mol / L 2-MBIm methanol solution under high-speed stirring, and the product was filtered, washed several times with deionized water and methanol, and then vacuum-dried to obtain Cu(I)-2-MBIm condensate. glue powder.

[0063] Add 0.5mol ferric trichloride and 0.25mol ferric dichloride to a stirred reactor containing 1 L of distilled water, raise the temperature to 90°C under the protection of nitrogen, then add 100mL concentrated ammonia water under high-speed stirring conditions, and the solution becomes After dark, 20mmol sodium citrate was quickly 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. Take 1g of citric acid modified Fe 3 o 4 Nanoparticle...

Embodiment 2

[0066] Fe 3 o 4 @SiO 2 The preparation of @Gel-Chitosan microspheres, the preparation steps are:

[0067] 1 L 0.01mol / L CuCl 2The ethanol solution was added dropwise to an equal volume of 0.01mol / L 2-MBIm ethanol solution under high-speed stirring, and the product was filtered, washed several times with deionized water and ethanol, and then vacuum-dried to obtain Cu(I)-2-MBIm Gel powder.

[0068] Add 0.1mmol ferric trichloride and 0.05mmol ferric dichloride to a stirred reactor containing 1 L of distilled water, raise the temperature to 60°C under the protection of nitrogen, and then add 30mL concentrated ammonia water under high-speed stirring conditions, and the solution becomes After dark, 2mmol sodium citrate was quickly added, and the constant temperature reaction was continued for 20min. The product was separated and recovered with a magnet, washed several times with deionized water and stored in water. Take 1g of citric acid modified Fe 3 o 4 Nanoparticles were ...

Embodiment 3

[0071] Fe 3 o 4 @SiO 2 The preparation of @Gel-Chitosan microspheres, the preparation steps are:

[0072] 1 L 0.5mol / L CuBr 2 The acetonitrile solution was added dropwise to an equal volume of 0.5mol / L 2-MBIm acetonitrile solution under high-speed stirring, and the product was filtered, washed several times with deionized water and ethanol, and then vacuum-dried to obtain Cu(I)-2-MBIm Gel powder.

[0073] Add 0.25mmol ferric trichloride and 0.125mmol ferric dichloride to a stirred reactor containing 1 L of distilled water, raise the temperature to 75°C under the protection of nitrogen, then add 65mL concentrated ammonia water under high-speed stirring conditions, and the solution becomes After dark, 1 mmol sodium citrate was quickly added, and the constant temperature reaction was continued for 40 minutes. The product was separated and recovered with a magnet, washed several times with deionized water and stored in water. Take 1g of citric acid modified Fe 3 o 4 Nanopa...

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Abstract

The invention relates to a Cu(I) metal gel and chitosan composite magnetic microsphere adsorption agent with good acid resistance and oxido-reduction responsiveness as well as a preparation method and application of the adsorption agent. The method comprises the following steps: (1), preparing Cu(I)-2-mercapto benzimidazole (Cu(I)-2-MBIm) metal gel powder; (2), preparing single-coated magnetic SiO2 nano-particles; (3), preparing the magnetic SiO2 nano-particle and Cu(I)-2-MBIm gel powder coated chitosan microsphere. The preparation method provided by the invention is simple in process and mild in condition and is very suitable for large-scale commercialized production; besides, prepared magnetic composite not only has good acid resistance. but also has good detoxicating and removing property to Cr(VI) ions; the used adsorption agent can be effectively regenerated by an ascorbic acid solution very easily.

Description

technical field [0001] The invention relates to a redox responsive Cu(I) metal gel and chitosan composite magnetic microspheres (Fe 3 o 4 @SiO 2 @Gel-Chitosan), preparation method and application thereof, specifically relate to an acid-resistant magnetic metal gel and chitosan composite material having excellent reduction, detoxification and adsorption removal properties for hexavalent chromium acid wastewater, preparation method and Its application belongs to the field of water treatment. Background technique [0002] Chromium is an important chemical raw material, which is widely used in electroplating, chromium salt industry, metal smelting, leather tanning and pigment industries. However, the resulting large amount of chromium-containing wastewater has brought great harm to human beings and the environment. Chromium mainly exists in two forms of Cr(III) and Cr(VI) in water bodies, among which Cr(VI) is highly toxic and carcinogenic, and its toxicity is 100 times that...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30B01J20/34C02F1/28C02F1/70C02F1/72C02F101/22
CPCB01J20/24B01J20/28009B01J20/28021B01J20/3425B01J2220/4825C02F1/286C02F1/70C02F2101/22
Inventor 刘会洲孙西同杨良嵘
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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