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Chitosan-modified sodium bentonite, preparation method and application

A sodium-based bentonite and chitosan modification technology, applied in chemical instruments and methods, water/sludge/sewage treatment, water pollutants, etc., can solve the problems of increasing the distance between the original soil layers, and increase the adsorption surface area. , the reaction conditions are mild, and the preparation process is simple.

Active Publication Date: 2017-02-22
HUANGHUAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method is prepared by using bentonite as raw material, heavy metal chelating agent ethylenediamine and chitosan as modifiers, wherein ethylenediamine can increase the distance between original soil layers, and helps chitosan to enter the bentonite layer and be loaded on it. surface, thereby improving the adsorption performance of the material for heavy metals, but not for the treatment of dye wastewater

Method used

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  • Chitosan-modified sodium bentonite, preparation method and application
  • Chitosan-modified sodium bentonite, preparation method and application
  • Chitosan-modified sodium bentonite, preparation method and application

Examples

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Effect test

Embodiment 1

[0041] Chitosan modified sodium bentonite is prepared by the following steps:

[0042] 1) Preparation of intermediate products

[0043] Disperse 0.5g of sodium bentonite in 70mL of isopropanol, stir and mix for 30min, add 5g of chloroacetic acid and 3 drops of concentrated sulfuric acid, reflux at 80°C for 5h, filter with suction, collect the solid, and dry at 60°C for 4h for later use ;

[0044] 2) Preparation of modified sodium bentonite

[0045] Disperse 0.5g of chitosan in 70mL of isopropanol, add 1mL of KOH aqueous solution with a concentration of 200g / L, stir and mix, and raise the temperature to 40°C in a water bath, and alkalinize for 70min; then add 0.5g of the product in step 1), and stir Mix and react at a constant temperature at 40°C for 6h. After the reaction is complete, the product is washed with isopropanol, filtered three times, and dried at 60°C for 4h to obtain the product.

Embodiment 2

[0047]Chitosan modified sodium bentonite is prepared by the following steps:

[0048] 1) Preparation of intermediate products

[0049] Disperse 0.5g of sodium bentonite in 100mL of isopropanol, stir and mix for 30min, add 4.5g of chloroacetic acid and 4 drops of concentrated sulfuric acid, reflux at 70°C for 6h, filter with suction, collect the solid, and dry at 50°C for 5h spare;

[0050] 2) Preparation of modified sodium bentonite

[0051] Disperse 0.5g of chitosan in 70mL of isopropanol, add 1mL of KOH aqueous solution with a concentration of 180g / L, stir and mix, and raise the temperature to 45°C in a water bath, and alkalinize for 1h; then add 0.4g of the product in step 1), and stir Mix and react at a constant temperature at 30°C for 7h. After the reaction is complete, the product is washed with isopropanol, filtered three times, and dried at 50°C for 5h to obtain the product.

Embodiment 3

[0053] Chitosan modified sodium bentonite is prepared by the following steps:

[0054] 1) Preparation of intermediate products

[0055] Disperse 0.5g of sodium bentonite in 120mL of isopropanol, stir and mix for 30min, add 5.5g of chloroacetic acid and 4 drops of concentrated sulfuric acid, reflux at 90°C for 4h, filter with suction, collect the solid, and dry at 70°C for 3h spare;

[0056] 2) Preparation of modified sodium bentonite

[0057] Disperse 0.5g of chitosan in 70mL of isopropanol, add 1mL of KOH aqueous solution with a concentration of 220g / L, stir and mix, and raise the temperature to 50°C in a water bath, and alkalinize for 50min; then add 0.6g of the product in step 1), and stir Mix and react at a constant temperature at 50°C for 5h. After the reaction is complete, the product is washed with isopropanol, filtered three times, and dried at 70°C for 3h to obtain the product.

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Abstract

The invention discloses chitosan-modified sodium bentonite, a preparation method and an application and belongs to the technical field of modified bentonite adsorbents and water treatment. Chitosan is supported on the surface of sodium bentonite under the bridging function of chloroactic acid with a chemical reaction synthesis method, that is, natural sodium bentonite is firstly organically modified with chloroacetic acid and then reacts with alkalified chitosan, and chitosan-modified sodium bentonite is obtained. Compared with conventional mechanical mixing, the roughness degree of the material is increased through chemical modification, the number of O and N atoms capable of generating chemical adsorption is increased, the adsorption surface area is increased, so that modified sodium bentonite has excellent adsorption performance and heat performance, has the highest chrome azurol S adsorption rate reaching 99.8% at the normal temperature and can serve as an adsorbent to be used for treatment of wastewater containing a color developing agent or dye.

Description

technical field [0001] The invention relates to a chitosan-modified sodium-based bentonite, and also relates to a preparation method and application of the modified sodium-based bentonite, belonging to the technical field of modified bentonite adsorbents and water treatment. Background technique [0002] Chitosan (Chitosan), also known as deacetylated chitin, is obtained by deacetylation of chitin (Chitin), which exists widely in nature, and its chemical name is polyglucosamine (1-4)-2-amino-B-D glucose. Chitosan is an alkaline sugar with good adsorption, film-forming, permeability, fibrillation, hygroscopicity and moisturizing properties, and is widely used in medicine, chemical industry, food and other fields. Chitosan molecules contain a large number of free amino groups and hydroxyl groups, which can form stable chelates with heavy metal ions, rare earth metal ions, etc., and can be used for the treatment of various heavy metal ion wastewater. However, chitosan has a lo...

Claims

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Application Information

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IPC IPC(8): B01J20/24C02F1/28B01J20/30C02F101/22
CPCB01J20/12B01J20/24C02F1/288C02F2101/22
Inventor 张军丽刘卉张燕张敬华柳准刘景民
Owner HUANGHUAI UNIV
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