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One-step preparation method of sodium carboxymethyl cellulose/polyethyleneimine (CMC/PEI) double-network hydrogel with function of efficiently removing Cr (VI)

A dual-network, hydrogel technology, applied in water/sewage treatment, adsorption water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of complex preparation process, large consumption of raw materials, low product purity, etc. Achieve the effects of enriching the three-dimensional porous network structure, improving the utilization rate, and overcoming the complexity of the preparation process

Active Publication Date: 2018-07-31
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the problems of complex preparation process of existing double network hydrogels, large consumption of raw materials, low product purity, serious shortage of chromium removal performance, etc., the present invention provides a one-step process of CMC / PEI double network hydrogels with high efficiency of Cr(VI) removal Preparation method, the prepared double-network hydrogel has a rich three-dimensional porous structure, which is conducive to the mass transfer of Cr(VI), and is rich in a variety of effective functional groups. The protonated amine group binds to Cr(VI) through electrostatic attraction, The Cr(III) obtained by the reduction of hydroxyl groups can further coordinate with the amine groups and carboxylate groups on the hydrogel, thus realizing the efficient removal of chromium

Method used

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  • One-step preparation method of sodium carboxymethyl cellulose/polyethyleneimine (CMC/PEI) double-network hydrogel with function of efficiently removing Cr (VI)
  • One-step preparation method of sodium carboxymethyl cellulose/polyethyleneimine (CMC/PEI) double-network hydrogel with function of efficiently removing Cr (VI)
  • One-step preparation method of sodium carboxymethyl cellulose/polyethyleneimine (CMC/PEI) double-network hydrogel with function of efficiently removing Cr (VI)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A kind of one-step preparation method of the CMC / PEI double network hydrogel of efficient Cr (VI) removal, its preparation steps are:

[0038] Weigh 5g of sodium carboxymethylcellulose powder and dissolve it in 100mL of distilled water, and obtain a colloidal solution of sodium carboxymethylcellulose by ultrasonication for 1h, weigh 1.2g of polyethyleneimine and dissolve it in 27.2mL of distilled water, and stir it magnetically at room temperature Obtain polyethyleneimine solution;

[0039] Weigh the above 12.8mL sodium carboxymethylcellulose colloidal solution into 27.2mL polyethyleneimine solution to obtain a mixed solution, mechanically stir at room temperature for 10min until uniformly mixed, take 40ml of the mixed solution, add 0.7mL epichlorohydrin to it , mechanically stirred for 15 minutes and heated at 60°C for 4 hours to cross-link to obtain a double-network hydrogel. Wash the double-network hydrogel with distilled water until it is neutral, and store it for l...

Embodiment 2

[0041] A kind of one-step preparation method of the CMC / PEI double network hydrogel of efficient Cr (VI) removal, its preparation steps are:

[0042] Weigh 4g of sodium carboxymethylcellulose and dissolve it in 100mL of distilled water, obtain a colloidal solution of sodium carboxymethylcellulose after ultrasonication for 2 hours, weigh 0.64g of polyethyleneimine and dissolve it in 19.5mL of distilled water, and stir it magnetically at room temperature Obtain polyethyleneimine solution;

[0043] Weigh the above 20.5mL sodium carboxymethylcellulose colloidal solution into 19.5mL polyethyleneimine solution to obtain a mixed solution, mechanically stir at room temperature for 20min until uniformly mixed, take 40ml of the mixed solution, add 0.8mL epichlorohydrin to it , mechanically stirred for 15 min, and then heated at 50° C. for 8 h for cross-linking to obtain a double network hydrogel. Wash the double network hydrogel with distilled water until it is neutral, and save it for...

Embodiment 3

[0045] A kind of one-step preparation method of the CMC / PEI double network hydrogel of efficient Cr (VI) removal, its preparation steps are:

[0046] Weigh 6g of sodium carboxymethylcellulose and dissolve it in 100mL of distilled water. After ultrasonication for 1 hour, a colloidal solution of sodium carboxymethylcellulose is obtained. Weigh out 0.92g of polyethyleneimine and dissolve it in 23.33mL of distilled water. Stir magnetically at room temperature Obtain polyethyleneimine solution;

[0047] Weigh the above 16.67mL sodium carboxymethylcellulose colloidal solution into 23.33mL polyethyleneimine solution to obtain a mixed solution, mechanically stir for 5 minutes at room temperature until uniformly mixed, take 40ml of the mixed solution, add 0.8mL epichlorohydrin to it , mechanically stirred for 5 min, and then heated at 50° C. for 6 h for cross-linking to obtain a double network hydrogel. Wash the double network hydrogel with distilled water until it is neutral, and sav...

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Abstract

The invention relates to a one-step preparation method of sodium carboxymethyl cellulose / polyethyleneimine (CMC / PEI) double-network hydrogel with a function of efficiently removing Cr (VI). The preparation method comprises the following steps: evenly stirring a CMC colloidal solution and a PEI solution so as to form a mixed colloidal solution, and then adding a crosslinking agent for carrying outa crosslinking reaction so as to obtain the CMC / PEI double-network hydrogel; the one-step preparation method, provided by the invention, of the CMC / PEI double-network hydrogel with the function of efficiently removing the Cr (VI) is simple and easy to control, low in cost, stable and reliable, and can effectively remove the Cr (VI); therefore, the CMC / PEI double-network hydrogel has a broad application prospect in the field of pollution control.

Description

technical field [0001] The invention belongs to the field of heavy metal pollution control, and relates to a one-step preparation method of a CMC / PEI double network hydrogel with high-efficiency Cr(VI) removal. Background technique [0002] A large amount of chromium-containing wastewater is produced in industrial production processes such as electroplating, metal processing, and printing and dyeing. Due to its non-biodegradability, high toxicity, and carcinogenicity, it has become an increasingly serious global environmental problem in recent years. Among the removal technologies of heavy metal ions such as reduction, chemical precipitation, membrane filtration, adsorption, and ion exchange, the adsorption method is widely used because of its simple operation, low cost, and flexible choice of adsorbents. [0003] The removal efficiency of adsorption mainly depends on the type of adsorbent. A large number of studies have shown that due to the unique physicochemical properti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/28B01J20/30C02F1/28C08L1/28C08L79/02C08J3/075C08J3/24C02F101/22
CPCC02F1/288C08J3/075C08J3/24C08J3/246B01J20/264B01J20/28047C02F2101/22C08J2479/02C08J2301/28
Inventor 刘福强宋丽朱长青袁媛李爱民
Owner NANJING UNIV
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