Intelligent hydrogel as well as preparation method and application thereof

A hydrogel and intelligent technology, applied in chemical instruments and methods, other chemical processes, water/sewage treatment, etc., can solve problems such as difficult heavy metal ions, complex preparation process of adsorbents, high cost, etc., to achieve the required time Short, product yield is green and environmentally friendly, and the effect of avoiding secondary pollution

Active Publication Date: 2015-05-06
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large number of research works have achieved the removal of heavy metal ions in water by preparing hydrogels with sensitive functional groups. However, these works often complicate the preparation process of adsorbents (Vani, J.S.; Rao, K.M.; Reddy, N.S.G. ; Rao, K.K.Synthesis and Characterization of Sodium Carboxy Methyl Cellulose / Poly(Acrylamide) Magnetic Nano Composite Semi Ipn' s for Removal of Heavy Metal Ions.World, 2013, 2, 33.), the cost is high and it is difficult to really realize the heavy metal Intelligent control of ion adsorption performance

Method used

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  • Intelligent hydrogel as well as preparation method and application thereof
  • Intelligent hydrogel as well as preparation method and application thereof
  • Intelligent hydrogel as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Weigh 4.2g FeCl 2 4H 2 O and 8.5g of FeCl 3 ·6H 2 O was completely dissolved in 150mL of ethanol-water mixed solvent with a volume ratio of 1:1 to form a mixed solution. Under nitrogen protection, it was placed in a constant temperature water bath at 60°C for mechanical stirring at a speed of 250r / min, and slowly added dropwise Ammonia water was added until the pH of the solution was 10. At this time, a black precipitate was precipitated, and the reaction was continued for 3 hours before stopping. The black precipitate after magnetic separation was washed repeatedly with water until the washing liquid was neutral. The washed product was dried in a vacuum oven. After drying, the hydrophilic Fe 3 o 4 nanoparticles.

[0024] (2) Ultrasonic dispersion of 0.5 g of iron ferric oxide nanoparticles in 20 mL of chitosan solution with a concentration of 5 g / 200 mL to form an aqueous phase, and then adding 0.5 g of N-isopropylacrylamide therein. Then, 0.010 g of N,N'-m...

Embodiment 2

[0027] The difference between this example and Example 1 is that the amount of N,N'-methylenebisacrylamide and ammonium persulfate used are both 0.022g, and the rest are the same as those described in Example 1.

Embodiment 3

[0029] (1) Weigh 3.5g FeCl 2 4H 2 O and 7.7g of FeCl 3 ·6H 2 O was completely dissolved in 200mL of ethanol-water mixed solvent with a volume ratio of 1:1 to form a mixed solution. Under nitrogen protection, it was placed in a constant temperature water bath at 70°C for mechanical stirring at a speed of 300r / min, and slowly added dropwise Ammonia water was added until the pH of the solution was 11. At this time, a black precipitate was precipitated, and the reaction was continued for 3 hours before stopping. The black precipitate after magnetic separation was washed repeatedly with water until the washing liquid was neutral. The washed product was dried in a vacuum oven. After drying, the hydrophilic Fe 3 o 4 nanoparticles.

[0030] (2) Ultrasonic dispersion of 0.2 g of iron ferric oxide nanoparticles in 20 mL of chitosan solution with a concentration of 4 g / 200 mL to form an aqueous phase, and then adding 0.4 g of N-isopropylacrylamide. Then, 0.015 g of N,N'-methylene...

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Abstract

The invention discloses an intelligent hydrogel as well as a preparation method and an application thereof and a hydrogel. The intelligent hydrogel is P(NIPAM-co-CS)/Fe3O4 and comprises iron oxide, N-isopropyl acrylamide and chitosan. The preparation method comprises the following steps: dissolving FeCl2.4H2O and FeCl3.6H2O in a mixed solvent of ethanol and water and reacting to prepare hydrophilic Fe3O4 nanoparticles under the protection of nitrogen and by adopting ammonia water as a precipitating agent; ultrasonically dispersing the prepared Fe3O4 nanoparticles in a chitosan liquid, adding a temperature-sensitive monomer N-isopropyl acrylamide and in the presence of a crosslinking agent and an initiator and by adopting tetramethylethylenediamine as an accelerator, carrying out polymerization reaction to prepare the intelligent hydrogel P(NIPAM-co-CS)/Fe3O4 by virtue of a micro-emulsion polymerization method. The intelligent hydrogel can be applied in the preparation of a water body heavy metal ion adsorption-desorption agent for removing heavy metal ions in water body.

Description

technical field [0001] The invention relates to a hydrogel, in particular to an intelligent hydrogel and its preparation method and application. Background technique [0002] In recent years, with the acceleration of industrialization and urbanization, especially the development of mining, smelting, electroplating and other industries, heavy metal ions such as chromium, copper, mercury, and lead in water bodies have gradually increased. The bioaccumulation and toxic accumulation of heavy metal ions pose a great threat to human health, so seeking effective water heavy metal removal technology has become a hot topic in recent research. Among many water heavy metal treatment technologies (such as chemical precipitation, ion exchange and adsorption), adsorption has been the most widely used due to its high efficiency and easy handling. In adsorption applications, the choice of adsorbent is critical. Traditional adsorbent ( D.; V.; Gorgievski, M.; G.; R.Adsorption of he...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C08F220/54C08F222/38C08K3/22B01J20/26B01J20/30C02F1/28C02F1/62
Inventor 朱爱梅孙敏敏
Owner XIAMEN UNIV
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