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Preparation method of magnetic composite hydrogel for copper ion adsorption

A composite hydrogel, copper ion technology, applied in the fields of adsorption water/sewage treatment, chemical instruments and methods, water pollutants, etc., can solve the problems of weak adsorption performance, poor hydrophilicity, affecting adsorption capacity, etc., and achieve adsorption capacity. The effect of improving, increasing porosity, and increasing adsorption capacity

Active Publication Date: 2018-12-14
晋江瑞碧科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the CA molecular chain only contains hydroxyl and acetyl groups, and the adsorption performance of hydroxyl and acetyl groups on heavy metal ions is weak, and CA is poor in hydrophilicity, which greatly affects its adsorption capacity.

Method used

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  • Preparation method of magnetic composite hydrogel for copper ion adsorption
  • Preparation method of magnetic composite hydrogel for copper ion adsorption

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1) Preparation of cellulose nanofibers

[0031] Quenching solution preparation: add 0.28g cellulose acetate to 2g tetrahydrofuran and 5g N,N'-dimethylformamide mixed solvent, magnetically stir and dissolve at room temperature to obtain quenching solution;

[0032] Take 5mL of quenching solution and pour it into a petri dish with a diameter of 5cm, put the petri dish in the refrigerator, and quench at -30°C for 2.7h. After the end, quickly take it out and put it into a 500mL ice-water mixture, and change the distilled water every 6h, 4 times. Finally, freeze-drying obtains cellulose acetate nanofibers;

[0033] The cellulose acetate nanofibers were soaked in 0.1mol / L NaOH / ethanol solution for 24h, and then washed with distilled water until the pH value of the washing liquid was 7. Cellulose nanofibers were obtained by freeze-drying.

[0034] 2) Preparation of cellulose nanofiber grafted poly(acrylic acid-co-maleic anhydride) hydrogel.

[0035] Dissolve 1 g of vinyltr...

Embodiment 2

[0042] 1) Preparation of cellulose nanofibers

[0043] Quenching liquid preparation: add 0.20g cellulose acetate to 2g tetrahydrofuran and 5g N,N'-dimethylformamide mixed solvent, magnetically stir and dissolve at room temperature to obtain quenching liquid;

[0044] Take 5mL of quenching solution and pour it into a petri dish with a diameter of 5cm, put the petri dish in the refrigerator, and quench at -15°C for 2.5h. After the end, quickly take it out and put it into a 500mL ice-water mixture, and change the distilled water every 6h, 4 times. Finally, freeze-drying obtains cellulose acetate nanofibers;

[0045] The cellulose acetate nanofibers were soaked in 0.08mol / L NaOH / ethanol solution for 24h, and then washed with distilled water until the pH value of the washing solution was 7. Cellulose nanofibers were obtained by freeze-drying.

[0046] 2) Preparation of cellulose nanofiber grafted poly(acrylic acid-co-maleic anhydride) hydrogel.

[0047] Dissolve 1 g of vinyltri...

Embodiment 3

[0053] 1) Preparation of cellulose nanofibers

[0054] Quenching solution preparation: add 0.20g cellulose acetate to 2g tetrahydrofuran and 4g N,N'-dimethylformamide mixed solvent, magnetically stir and dissolve at room temperature to obtain quenching solution;

[0055] Take 5mL of quenching solution and pour it into a petri dish with a diameter of 5cm, put the petri dish in the refrigerator, and quench at -20°C for 2.5h. After the end, quickly take it out and put it into a 500mL ice-water mixture, and change the distilled water every 6h, 4 times. Finally, freeze-drying obtains cellulose acetate nanofibers;

[0056] The cellulose acetate nanofibers were soaked in 0.15mol / L NaOH / ethanol solution for 24h, and then washed with distilled water until the pH value of the washing solution was 7. Cellulose nanofibers were obtained by freeze-drying.

[0057] 2) Preparation of cellulose nanofiber grafted poly(acrylic acid-co-maleic anhydride) hydrogel.

[0058] Dissolve 1 g of viny...

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Abstract

The invention discloses a preparation method of magnetic composite hydrogel for copper ion adsorption. The preparation method comprises: deacetylating cellulose acetate nanofibers to obtain cellulosenanofibers, dissolving acrylic acid, maleic anhydride and N, N'-methylene bisacrylamide in a nitric acid solution to obtain a reaction solution A, dissolving ammonium cerium nitrate in the nitric acidsolution, adding the cellulose nanofibers and vinyl-modified silica into the solution to obtain a reaction solution B, adding the reaction solution A into the reaction solution B drop by drop for a reaction so that cellulose nanofiber-grafted poly(acrylic acid-co-maleic anhydride)hydrogel is obtained, dissolving ferrous chloride and ferric chloride in deionized water, adding the cellulose nanofiber-grafted poly(acrylic acid-co-maleic anhydride)hydrogel and ammonia water into the solution and carrying out a reaction process. The preparation method is simple and fast, has strong operability andis very suitable for industrial production.

Description

technical field [0001] The invention relates to a preparation method of a magnetic composite hydrogel used for copper ion adsorption, and belongs to the field of adsorption materials. Background technique [0002] With the rapid development of industry and agriculture, Cu 2+ 、Ni 2+ 、Cd 2+ 、Co 2+ and Pb 2+ A large amount of heavy metal ions such as ions are discharged, which seriously pollutes the environment. Unlike organic pollutants, these heavy metals cannot be biodegraded, and are easily enriched into the human body through the food chain, causing human poisoning. To protect human beings and the environment, these toxic heavy metals should be removed from wastewater. At present, various methods are widely used to remove toxic heavy metals in wastewater, including chemical precipitation, chemical oxidation / reduction, reverse osmosis, membrane separation, ion exchange, adsorption, etc. Among these methods, the adsorption method meets the requirements of simple and e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/06B01J20/265B01J20/28009B01J20/28047B01J20/28054C02F1/285C02F2101/20
Inventor 胡家朋林皓付兴平刘淑琼赵瑨云徐婕
Owner 晋江瑞碧科技有限公司
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