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Dual-crosslinked cellulose-based hydrogel prepared from cold plasma and preparation method and application of dual-crosslinked cellulose-based hydrogel

A cold plasma, double cross-linking technology, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems of toxic chemical reagents, pollute the environment, complex processes, etc. Adsorption effect, the effect of improving the adsorption rate

Active Publication Date: 2022-03-25
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The surface of the modified hydrogel prepared by this method introduces a large number of amino groups, which has a strong heavy metal adsorption capacity, but this method requires the use of a large amount of cellulose dissolving solution, initiator and modification solution. These chemical reagents are toxic, pollute the environment, and are expensive. , difficult to recycle
In addition, after the gel-like polymer is soaked in the modified solution, it needs to be washed repeatedly to obtain the finished product. The process is complicated, and there is a certain energy consumption problem in the actual production process.

Method used

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  • Dual-crosslinked cellulose-based hydrogel prepared from cold plasma and preparation method and application of dual-crosslinked cellulose-based hydrogel
  • Dual-crosslinked cellulose-based hydrogel prepared from cold plasma and preparation method and application of dual-crosslinked cellulose-based hydrogel
  • Dual-crosslinked cellulose-based hydrogel prepared from cold plasma and preparation method and application of dual-crosslinked cellulose-based hydrogel

Examples

Experimental program
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Effect test

Embodiment 1

[0040] The method for preparing double cross-linked cellulose-based hydrogel based on cold plasma and its application in this embodiment are as follows:

[0041]Weigh 7g of NaOH and 12g of urea, dissolve them in 81g of deionized water, and freeze at -12°C for 1 hour to obtain a NaOH / urea system. Weigh 2 g of dried pineapple pomace cellulose and place it in a NaOH / urea system, stir and disperse until the cellulose is completely dissolved, and centrifuge at 5000 r / min for 5 min to obtain a cellulose solution. Weigh 6g of acrylic acid (AA) and 0.6g of 2-acrylamide-2-methylpropane sulfonic acid (AMPS) and add it to the cellulose solution to perform cold plasma treatment (voltage is 100kV, frequency is controlled at 50Hz, power is controlled at 45kW) , the treatment time was 15 min, the mixture was uniformly stirred, and allowed to stand at room temperature for 24 h. The product was washed with water and acetone, and vacuum dried to constant weight to obtain a double cross-linked c...

Embodiment 2

[0043] Weigh 7g of NaOH and 12g of urea, dissolve them in 81g of deionized water, and freeze at -12°C for 1 hour to obtain a NaOH / urea system. Weigh 2 g of dried pineapple pomace cellulose and place it in a NaOH / urea system, stir and disperse until the cellulose is completely dissolved, and centrifuge at 5000 r / min for 5 min to obtain a cellulose solution. Weigh 6g of acrylic acid (AA) and 0.6g of 2-acrylamide-2-methylpropanesulfonic acid (AMPS) and add it to the cellulose solution and then carry out cold plasma treatment (voltage is 120kV, frequency is controlled at 50Hz, power is controlled at 45kW) , the treatment time was 30 min, the mixture was uniformly stirred, and allowed to stand at room temperature for 24 h. The product was washed with water and acetone, and dried in vacuum to constant weight to obtain a double-crosslinked cellulose hydrogel. The prepared cellulose-based hydrogel was put into Zn with a concentration of 600 mg / L and a pH of 6.5. 2+ , Cd 2+ and Cr 3...

Embodiment 3

[0045] Weigh 7g of NaOH and 12g of urea, dissolve them in 81g of deionized water, and freeze at -12°C for 1 hour to obtain a NaOH / urea system. Weigh 2 g of dried pineapple pomace cellulose and place it in a NaOH / urea system, stir and disperse until the cellulose is completely dissolved, and centrifuge at 5000 r / min for 5 min to obtain a cellulose solution. Weigh 6g of acrylic acid (AA) and 0.6g of 2-acrylamide-2-methylpropanesulfonic acid (AMPS) and add it to the cellulose solution and then carry out cold plasma treatment (voltage is 150kV, frequency is controlled at 50Hz, power is controlled at 45kW) , the treatment time was 45 min, the mixture was uniformly stirred, and allowed to stand at room temperature for 24 h. The product was washed with water and acetone, and dried in vacuum to constant weight to obtain a double-crosslinked cellulose hydrogel. The prepared cellulose-based hydrogel was put into Zn with a concentration of 800 mg / L and a pH of 6. 2+ , Cd 2+ and Cr 3+ ...

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Abstract

The invention discloses dual-crosslinked cellulose-based hydrogel prepared by cold plasma as well as a preparation method and application of the dual-crosslinked cellulose-based hydrogel, and belongs to the field of cellulose-based hydrogel. The preparation method comprises the following steps: adding acrylic acid (AA) and 2-acrylamide-2-methyl propane sulfonic acid (AMPS) into a cellulose solution, carrying out cold plasma treatment, uniformly stirring and mixing, standing, washing and drying to obtain the double-crosslinked cellulose hydrogel. The cellulose solution is obtained by pre-cooling a NaOH / urea system, adding dried pineapple peel residue cellulose, stirring and dispersing until the cellulose is completely dissolved, and centrifuging. According to the invention, pineapple peel residue cellulose is used as a raw material, and a cold plasma technology is utilized to initiate and prepare the dual-crosslinked cellulose-based hydrogel with good mechanical properties, so that the use of a chemical initiator is reduced, and the method is green and environment-friendly. A large number of carboxyl groups are introduced to the surface of the hydrogel, so that heavy metal ions in sewage can be efficiently and rapidly removed, and the dual purpose of treating waste with waste is achieved.

Description

technical field [0001] The invention belongs to the field of cellulose-based hydrogels, and particularly relates to a double-crosslinked cellulose-based hydrogel prepared by cold plasma and a preparation method and application thereof. Background technique [0002] With the intensification of people's sense of energy crisis and the increasing awareness of protecting nature, the development and utilization of natural materials has attracted more and more attention. Natural materials are abundant and renewable, with great potential for utilization. As one of the most abundant biomass resources in the world, cellulose is widely used because of its biocompatibility and biodegradability. However, the polyhydroxyl structure of cellulose leads to the easy formation of a large number of hydrogen bonds between and within the molecule, showing great cohesion, making cellulose difficult to dissolve in water and most common organic solvents, and thus difficult to use directly. At pres...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/02C08F220/58C08F220/06C08F2/52C02F1/28C02F101/20C02F101/22
CPCC08F251/02C08F2/52C02F1/285C02F2101/20C02F2101/22C08F220/585C08F220/06
Inventor 成军虎韩卓芮孙大文马骥
Owner SOUTH CHINA UNIV OF TECH
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