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Polyacrylonitrile fiber-hemin biomimetic catalyst and preparation method thereof

A technology of polyacrylonitrile fiber and biomimetic catalyst, applied in the field of biomimetic catalysis, can solve the problems of unsatisfactory catalytic activity, high energy consumption, complicated preparation process, etc., and achieve the effects of improving catalytic activity, low energy consumption and simple process flow

Active Publication Date: 2017-01-04
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

TiO 2 Materials such as thin films, graphene, and activated carbon fibers can be used to support metalloporphyrins to prepare catalysts, which can effectively activate H 2 o 2 Oxidative degradation of organic pollutants, but there are still problems such as complex preparation process, high energy consumption or unsatisfactory catalytic activity, which limit its further application

Method used

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  • Polyacrylonitrile fiber-hemin biomimetic catalyst and preparation method thereof
  • Polyacrylonitrile fiber-hemin biomimetic catalyst and preparation method thereof
  • Polyacrylonitrile fiber-hemin biomimetic catalyst and preparation method thereof

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preparation example Construction

[0018] The present invention also provides a kind of polyacrylonitrile fiber-hemin biomimetic catalyst preparation method, and concrete steps are:

[0019] 1) Take polyacrylonitrile fiber and 2-aminoimidazole according to weight ratio 1: (0.83-4.165), add polyacrylonitrile fiber to 2-aminoimidazole aqueous solution, adjust pH value to 9.5 with sodium hydroxide, at 95 ° C React with stirring for 2-6 hours, then take it out and wash and dry it repeatedly with distilled water to obtain modified polyacrylonitrile fibers.

[0020] 2) Take the modified polyacrylonitrile fiber and hemin according to the weight ratio 1: (0.1-0.5), place the modified polyacrylonitrile fiber in the DMF solution of hemin, and react for 1-2.5 minutes at 40-60°C under stirring conditions After h, it was taken out, washed repeatedly with DMF and distilled water, and then dried to obtain a polyacrylonitrile fiber-hemin biomimetic catalyst.

[0021] The concentration of the 2-aminoimidazole aqueous solution ...

Embodiment 1

[0024] 1) Put accurately weighed 1.0g polyacrylonitrile fibers into 50ml of 2-aminoimidazole aqueous solution with a concentration of 83.3g / L, adjust the pH value to 9.5 with sodium hydroxide, and react at 95°C for 4h under stirring conditions, Then take it out and repeatedly wash and dry it with distilled water to obtain the modified polyacrylonitrile fiber.

[0025] 2) Weigh 1.0g of modified polyacrylonitrile fiber and place it in 100ml of hemin DMF solution with a concentration of 4.0g / L, react at 60°C for 2.5h under stirring conditions, take it out, wash it repeatedly with DMF and distilled water, and then dry it , to obtain the first polyacrylonitrile fiber-hemin biomimetic catalyst.

[0026] The nitrogen content of the modified polyacrylonitrile fiber before loading hemin was determined to be 34.5% by an elemental analyzer, so as to evaluate its imidazole ring group content. Determination of catalyst iron ion content: accurately weigh 0.1g catalyst, dissolve in V(HNO 3...

Embodiment 2

[0028] The concentration of 2-aminoimidazole in Step 1 of Example 1 was adjusted to 66.7 g / L, the concentration of hemin in Step 2 was adjusted to 2.0 g / L, and the rest was the same as in Example 1 to obtain the second polyacrylonitrile fiber-hemin biomimetic catalyst. Through measurement and calculation, the nitrogen content in the fiber carrier material is 30.1%, and the iron ion content of the catalyst is 10.2 mg / g.

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Abstract

The invention discloses a polyacrylonitrile fiber-hemin biomimetic catalyst and a preparation method thereof. The biomimetic catalyst is in a shape of fibers and is prepared after 2-aminooimidazole modified polyacrylonitrile fibers and natural ferriporphyrin compound hemin react. The preparation method comprises steps as follows: firstly, polyacrylonitrile fibers are subjected to a modification reaction by the aid of 2-aminooimidazole under the conditions that the pH is 9.5 and the temperature is 95 DEG C, an active group containing an imidazole ring structure is obtained, the obtained modified acrylic fibers and a DMF solution of hemin are subjected to a coordination reaction, and the polyacrylonitrile fiber-hemin biomimetic catalyst simulating the structure of horseradish peroxidase is obtained. The biomimetic catalyst is applicable to an oxidation degradation reaction of dye and other organic pollutants in water; compared with treated hemin, the polyacrylonitrile fiber-hemin biomimetic catalyst has the advantages that the catalysis activity of the catalyst is remarkably enhanced due to introduction of a polyacrylonitrile fiber carrier, and the pH adaptability and the use stability of the catalyst are greatly improved.

Description

technical field [0001] The invention belongs to the technical field of biomimetic catalysis, in particular to a polyacrylonitrile fiber-hemin biomimetic catalyst used in the field of oxidative degradation of organic pollutants such as dyes in waste water and a preparation method thereof. Background technique [0002] In recent years, biomimetic catalysis technology has attracted extensive attention in the treatment of refractory organic pollutants such as dyes in water. Among them, metalloporphyrins have variable valence metal ions and conjugated large π-electron structures, thus possessing redox properties, and are considered as a potential highly efficient biomimetic catalyst. However, in the treatment of organic pollutants in water, metalloporphyrin catalysts are prone to self-polymerization, resulting in a significant decrease in activity, and there are also shortcomings such as narrow pH range, poor stability, and difficulty in separation and recovery. Loading metallop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/28C02F1/72D06M13/352C02F101/30D06M101/28
CPCD06M13/352C02F1/722C02F1/725B01J31/28C02F2101/308D06M2101/28B01J35/58
Inventor 韩振邦赵晓明韩旭赵晋
Owner TIANJIN POLYTECHNIC UNIV
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