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Floatable FeS-lignin hydrogel nano composite material, preparation method and application thereof

A nanocomposite material and hydrogel technology, which is applied in the field of floating FeS-lignin hydrogel nanocomposite materials, can solve problems such as difficult recycling and easy agglomeration, and achieve firm fixation, uniform nanoparticles, and complete removal of heavy metals Effect

Active Publication Date: 2021-05-11
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 and nanomaterials, it solves the problem of easy agglomeration and difficult recovery of heavy metal adsorption nanomaterials in the prior art, and provides new composite materials for the treatment of heavy metals

Method used

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  • Floatable FeS-lignin hydrogel nano composite material, preparation method and application thereof
  • Floatable FeS-lignin hydrogel nano composite material, preparation method and application thereof
  • Floatable FeS-lignin hydrogel nano composite material, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] (1) Take calcium lignosulfonate (number-average molecular weight 10000, purchased from Macklin) to prepare an aqueous solution with a solid content of 10%, and prepare sodium alginate (1% viscosity: 5000mPa.s, purchased from Macklin, article number S875036) Aqueous solutions with a solid content of 5% were mechanically stirred until completely dissolved. Mix the above two completely dissolved solutions according to the volume ratio of calcium lignosulfonate solution: sodium alginate solution is 1:1, and mechanically stir until the mixture is uniform;

[0054] (2) Slowly drop the homogeneously mixed liquid in step (1) into a 1mol / L ferrous sulfate solution with a dropping funnel to form a pellet, and the solution is protected by nitrogen gas, continuously stirred and soaked for 6 hours, and freeze-dried for 18 hours;

[0055] (3) Soak the freeze-dried pellets obtained in step (2) in 0.1 mol / L sodium sulfide solution for 2 hours, protect the solution with nitrogen gas, st...

Embodiment 2

[0057] (1) Get calcium lignosulfonate (number-average molecular weight 8000, purchased from Macklin) to prepare an aqueous solution with a solid content of 20%, and take sodium alginate (1% viscosity: 5000mPa.s, purchased from Macklin) to prepare a solid content of 2 % aqueous solution, respectively, mechanically stirred until completely dissolved. Mix the above two completely dissolved solutions according to the volume ratio of calcium lignosulfonate solution:sodium alginate solution is 1:0.5, and mechanically stir until the mixture is uniform;

[0058] (2) Slowly drop the homogeneously mixed liquid in step (1) into 2mol / L ferrous chloride solution with a dropping funnel to form pellets, the solution is protected by nitrogen gas, continuously stirred and soaked for 12h, and freeze-dried for 24h;

[0059] (3) Soak the freeze-dried pellets obtained in step (2) in a 0.5 mol / L sodium sulfide solution for 3 hours, protect the solution with nitrogen gas, stir continuously, and free...

Embodiment 3

[0061] (1) Take calcium lignosulfonate (number average molecular weight 5000, purchased from Macklin) to prepare an aqueous solution with a solid content of 15%, and take sodium alginate (1% viscosity: 5000mPa.s, purchased from Macklin) to prepare an aqueous solution with a solid content of 3 % aqueous solution, respectively, mechanically stirred until completely dissolved. Mix the above two completely dissolved solutions according to the volume ratio of calcium lignosulfonate solution: sodium alginate solution is 1:0.1, and mechanically stir until the mixture is uniform;

[0062] (2) Slowly drop the homogeneously mixed liquid in step (1) into 1.5mol / L ferrous nitrate solution with a dropping funnel to form pellets, the solution is protected by nitrogen gas, continuously stirred and soaked for 10 hours, and freeze-dried for 12 hours;

[0063] (3) Soak the freeze-dried pellets obtained in step (2) in a 1 mol / L sodium sulfide solution for 1 hour, pass through the solution under ...

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Abstract

The invention provides a floatable FeS-lignin hydrogel nano composite material, a preparation method and application thereof. According to the invention, a lignin hydrogel with high strength, light weight and weak water absorption is prepared by interpenetrating network cross-linking of calcium lignosulphonate and sodium alginate, and uniformly distributed nano FeS is loaded on the lignin hydrogel through an in-situ synthesis method, so that the preparation method is simple and convenient, and the raw materials are cheap and easy to obtain and environment-friendly; in the prepared floatable FeS-lignin hydrogel nano composite material, an interpenetrating network structure prevents aggregation and falling of nano FeS, so that the problems that FeS is easy to agglomerate and is difficult to apply and the adsorption effect is reduced due to agglomeration are solved, and the composite material for removing heavy metals has an obvious adsorption removal effect; and the light and weak-water-absorption hydrogel composite material can float, so that later recovery is effectively realized, the purpose of thoroughly removing heavy metals is achieved, and the hydrogel composite material has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of nanocomposite materials, and in particular relates to a floating FeS-lignin hydrogel nanocomposite material and its preparation method and application. Background technique [0002] In recent years, food safety problems caused by the entry of heavy metal Cd into soil and water have occurred frequently, and the toxicity of Cd pollution to the human body has become a research hotspot. Due to the high migration ability of Cd with water, it can also be multi-stage transmitted in the biosphere through the biomagnification effect, and it is difficult to remove once it enters the environment. [0003] At present, the methods of controlling Cd pollution in the environment are mainly divided into two categories according to the treatment methods of pollutants. One is to use biochemical means to passivate and precipitate the heavy metal Cd in water and cultivated soil, so as to reduce the toxicity of Cd in the envi...

Claims

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Application Information

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IPC IPC(8): B01J13/00B01J20/24B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J13/0065B01J20/24B01J20/0285B01J20/0229C02F1/286C02F1/281B01J20/28047C02F2101/20
Inventor 李永涛张玉龙刘永林徐会娟林学明杨行健王进进李文彦郭桂芳
Owner SOUTH CHINA AGRI UNIV
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