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A kind of hydrogel nanocomposite material and its preparation method and application

A nanocomposite material and hydrogel nanotechnology, applied in chemical instruments and methods, water pollutants, and other chemical processes, can solve the problems of easy agglomeration of materials, secondary pollution, etc., and achieve pollution avoidance and no secondary pollution , the effect of reducing environmental pollution

Active Publication Date: 2021-11-26
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By combining hydrogel technology with nanomaterials, it solves the problems in the existing technology that the water and soil heavy metal adsorption nanomaterials are easy to agglomerate and cause secondary pollution, and introduces new technical ideas for the treatment of heavy metals.

Method used

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  • A kind of hydrogel nanocomposite material and its preparation method and application
  • A kind of hydrogel nanocomposite material and its preparation method and application
  • A kind of hydrogel nanocomposite material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) Take 1g of lignin, 0.5g of acrylamide, 0.1g of maleic anhydride, 0.01g of cross-linking agent N,N'-methylenebisacrylamide and 0.5g of ferric chloride, add 20mL of deionized water, Dissolve completely with magnetic stirring.

[0044] (2) Add 2 mL of ammonia water (concentration: 25%) to the solution obtained in step (1) to adjust the pH to alkaline. 0.01 g of potassium persulfate was added as an initiator. Subsequently, 10 μL of tetramethylethylenediamine was added, stirred thoroughly and left to stand for 1 h to obtain a composite hydrogel.

[0045] (3) Soak the composite hydrogel obtained in (2) in 0.1mol / L sodium sulfide solution for 6 hours to obtain a black hydrogel, wash it with deionized water several times, and put it in the refrigerator for 12 hours at -10°C , freeze-dried for 12 hours, the heavy metal-removed hydrogel nanocomposite can be obtained.

[0046] figure 1 The physical picture of the hydrogel nanocomposite material prepared in this embodiment ...

Embodiment 2

[0048] (1) Take 10g of lignin, 1.5g of acrylamide, 0.5g of maleic anhydride, 0.015g of cross-linking agent N,N'-methylenebisacrylamide and 5g of ferrous chloride, add 100mL of deionized water, Dissolve completely with magnetic stirring.

[0049] (2) Add 10 mL of 10% potassium hydroxide to the solution obtained in step (1) to adjust the pH to alkaline. 0.03 g of potassium persulfate was added as an initiator. Subsequently, 40 μL of tetramethylethylenediamine was added, stirred thoroughly and left to stand for 5 h to obtain a composite hydrogel.

[0050] (3) Soak the composite hydrogel obtained in step (2) in 0.5 mol / L sodium sulfide solution for 24 hours to obtain a black hydrogel, wash it several times with deionized water, and put it in the refrigerator for 2 hours at -20°C Afterwards, freeze-dry for 24 hours to obtain a hydrogel nanocomposite material with heavy metals removed.

Embodiment 3

[0052] (1) Take 5g of lignin, 1g of acrylamide, 0.3g of maleic anhydride, 0.012g of cross-linking agent N,N'-methylenebisacrylamide and 2g of ferrous sulfate, add 50mL of deionized water, and stir magnetically Dissolve completely.

[0053] (2) Add 5 mL of 10% sodium hydroxide to the solution obtained in step (1) to adjust the pH to alkaline. 0.02 g of potassium persulfate was added as an initiator. Subsequently, 20 μL of tetramethylethylenediamine was added, stirred thoroughly and left to stand for 3 h to obtain a composite hydrogel.

[0054] (3) Soak the composite hydrogel obtained in step (2) in 0.3mol / L sodium sulfide solution for 12 hours to obtain a black hydrogel, wash it several times with deionized water, and put it in the refrigerator for 6 hours at -15°C Afterwards, freeze-dry for 18 hours to obtain a hydrogel nanocomposite material with heavy metals removed.

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Abstract

The invention provides a hydrogel nanocomposite material and its preparation method and application. The invention utilizes lignin and acrylamide to cross-link to prepare high-strength hydrogel, and supports nano-FeS inside through an in-situ synthesis method. The raw materials are cheap and easy to obtain, the preparation method is simple, and the process is environmentally friendly. The FeS nanoparticles in the prepared hydrogel nanocomposite are evenly distributed in the hydrogel space network, constituting the active sites, which can continuously play a role in the adsorption and removal of heavy metals; at the same time, the hydrogel itself is rich in functional groups and can also Adsorption removes heavy metals, forming a synergistic composite material system. The hydrogel nanocomposite material of the present invention has strong water absorption and swelling properties. When the heavy metal solution flows through the structural skeleton, it interacts with FeS nanoparticles to form sulfide and precipitate inside, which can be removed with the gel, and the effect of adsorption and removal of heavy metals is obvious. ,with broadly application foreground.

Description

technical field [0001] The invention belongs to the technical field of nanocomposite materials, and in particular relates to a hydrogel nanocomposite material and its preparation method and application. Background technique [0002] With the rapid development of industrial and agricultural production, the problem of heavy metal pollution has become more and more prominent. Heavy metals generally exist in nature in natural concentrations, but due to human activities, many heavy metals enter the atmosphere, water, and soil, causing serious environmental pollution. Heavy metals cannot be decomposed by microorganisms, but can only migrate, transform, disperse, and accumulate between different valence states. Accumulation to a certain limit will cause serious harm to animals and plants. If it is not treated in time, it will cause more serious problems in the future. [0003] The application of nanotechnology and nanomaterials to treat heavy metal wastewater and soil pollution b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/075C08L51/00C08K3/30C08F289/00C08F220/56C08F222/06C08F222/38B01J20/26B01J20/28B01J20/30C02F1/28C02F101/20C02F101/22
CPCB01J20/0229B01J20/0285B01J20/264B01J20/28047C02F1/285C02F2101/20C02F2101/22C08F289/00C08J3/075C08J2351/00C08K2003/3009C08K2201/011C08F220/56
Inventor 张玉龙刘永林李永涛张振王进进李文彦周咏茵
Owner SOUTH CHINA AGRI UNIV
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