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Amphoteric polysaccharide/cross-linked graphene oxide double-network composite hydrogel adsorption material and preparation method thereof

A composite hydrogel and adsorption material technology, applied in the field of amphoteric polysaccharide/cross-linked graphene oxide double network composite hydrogel adsorption material and its preparation, can solve the problems of graphene agglomeration, reduction of specific surface area, etc. The effect of improving adsorption performance, low price and wide source

Active Publication Date: 2018-01-12
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Graphene has the characteristics of large specific surface area and excellent mechanical properties, but graphene is prone to agglomeration, resulting in a decrease in its specific surface area.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] After dissolving 0.1g cellulose in 2.5g 7wt% NaOH / 12wt% urea aqueous solution with low temperature stirring, add 1g [2-(methacryloyloxy)ethyl]dimethyl-(3-sulfonic acid propyl ) ammonium hydroxide, 0.04g cerium ammonium nitrate, 0.03g N,N'-methylenebisacrylamide, stirred and dissolved to obtain a uniform solution. Add the homogeneous solution into the graphene oxide dispersion, the mass ratio of graphene oxide to cellulose is 1:10, mix evenly, and place in a microwave reactor. The microwave power was adjusted to 800 watts, and the reaction time was 3 minutes to carry out graft polymerization. Soak the obtained single-network composite hydrogel in pure water, wash and freeze-dry to obtain a xerogel. Soak the dry gel in the aqueous solution of hexamethylenediamine, and react at 80° C. for 24 hours to obtain a double-network composite hydrogel adsorption material.

Embodiment 2

[0018] Dissolve 0.5g of starch in 10mL of water, add 1g of methacryloxyethyltrimethylammonium chloride, 1g of sodium methacrylate, 0.1g of potassium persulfate, and 0.075g of N,N'-methylenebisacrylamide , and a homogeneous solution was obtained after stirring and dissolving. Add the homogeneous solution into the graphene oxide dispersion, the mass ratio of graphene oxide to starch is 1:20, mix well, and place in a microwave reactor. The microwave power was adjusted to 400 watts, and the reaction time was 5 minutes to carry out graft polymerization. Soak the obtained single-network composite hydrogel in pure water, wash and freeze-dry to obtain a xerogel. Soak the dry gel in the aqueous solution of hyperbranched polyethyleneimine, and react at 80° C. for 12 hours to obtain a double-network composite hydrogel adsorption material.

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Abstract

The invention discloses an amphoteric polysaccharide / cross-linked graphene oxide double-network composite hydrogel adsorption material and a preparation method thereof. The preparation method comprises the following steps: firstly, after uniformly mixing graphene oxide, a polysaccharide and an amphoteric ionic monomer (or a mixture of a cationic monomer and an anionic monomer), preparing single-network composite hydrogel through a microwave assisted grafting and copolymerization manner; then, crossly linking the single-network composite hydrogel with the graphene oxide in a water solution of apolyamino or amino-terminated polymer to obtain the double-network composite hydrogel adsorption material. The double-network composite hydrogel adsorption material prepared by the preparation methodhas excellent mechanical properties and can be used for removing heavy metal ions and organic pollutants at the same time; the double-network composite hydrogel adsorption material has a relatively high adsorption amount and a relatively rapid adsorption speed on the heavy metal ions and the organic pollutants.

Description

technical field [0001] The invention relates to an amphoteric polysaccharide / cross-linked graphene oxide double network composite hydrogel adsorption material and a preparation method thereof, belonging to the field of environmental functional materials. Background technique [0002] Due to the influence of various factors such as industrial wastewater discharge and landfill disposal of urban waste, the compound pollution in which heavy metal ions and organic matter coexist in the environment has become the main form of environmental pollution. These pollutants can not only cause the deterioration of the ecological environment, but also may enter the food chain, thereby causing harm to human health. Therefore, it is of great significance to develop efficient treatment methods and technologies that can simultaneously remove heavy metals and organic pollutants. [0003] At present, the treatment methods for simultaneously removing heavy metal ions and organic pollutants inclu...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F101/20C02F101/30
Inventor 王静静
Owner YANCHENG INST OF TECH
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