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Amidoxime-modified polyacrylonitrile nanofiber membrane bimetallic complex catalyst and preparation method thereof

A technology of nanofiber membrane and polyacrylonitrile, which is applied in organic compound/hydride/coordination complex catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., to achieve good adaptability, easy industrial promotion, and good catalysis active effect

Inactive Publication Date: 2014-02-05
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalyst preparation method has the advantages of simple process, low post-processing cost and easy industrial implementation.

Method used

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  • Amidoxime-modified polyacrylonitrile nanofiber membrane bimetallic complex catalyst and preparation method thereof
  • Amidoxime-modified polyacrylonitrile nanofiber membrane bimetallic complex catalyst and preparation method thereof
  • Amidoxime-modified polyacrylonitrile nanofiber membrane bimetallic complex catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1. Pretreatment of ordinary polyacrylonitrile fibers: immerse polyacrylonitrile yarns in a 1:1 mixed solution of ethanol and water at 25°C for 30 minutes, take them out and dry them in vacuum at 50°C for 3 hours for later use;

[0037] 2. The spinning of polyacrylonitrile nanofiber film: the polyacrylonitrile yarn of the described pretreatment of 16.0g accurately weighed, and it is immersed in the N of 84.0g, N-dimethylformamide solvent dissolves completely A polyacrylonitrile spinning solution with a mass fraction of 16.0% was prepared. The spinning of polyacrylonitrile nanofiber membrane was carried out on a self-made electrospinning device. By controlling the extrusion rate (0.60ml / h) of the spinning solution and the voltage (25kV) at the needle, the spinning solution was ejected from the needle and Drafting forms a white polyacrylonitrile nanofiber film on the surface of the rotating disk, wherein the fiber diameter is measured by Image-Pro Plus6.0 software as 510.3...

Embodiment 2

[0044] 1, 2, 3, 4 and 6 steps of technology are respectively the same as 1, 2, 3, 4 and 6 steps of technology in Example 1.

[0045] 5. Preparation of mixed aqueous solution of metal ions: use ferric chloride and copper sulfate to prepare a mixed aqueous solution of metal ions with a molar concentration of 0.1M. The molar concentration ratio of iron ions to copper ions in the mixed aqueous solution is required to be 3:1, and then After the resulting mixed solution was left to stand for 4 hours, it was filtered for subsequent use;

[0046] The prepared second amidoxime-modified polyacrylonitrile nanofiber membrane bimetallic complex catalyst (referred to as Fe-Cu-AO-n-PANFM-2) is brown in color. After measurement and calculation, the contents of iron ions and copper ions in the catalyst are 3.15mmol / g and 1.01mmol / g respectively.

Embodiment 3

[0048] 1, 2, 3, 4 and 6 steps of technology are respectively the same as 1, 2, 3, 4 and 6 steps of technology in Example 1.

[0049] 5. Preparation of mixed aqueous solution of metal ions: use ferric chloride and copper sulfate to prepare a mixed aqueous solution of metal ions with a molar concentration of 0.1M. The molar concentration ratio of iron ions to copper ions in the mixed aqueous solution is required to be 1:3, and then After the resulting mixed solution was left to stand for 4 hours, it was filtered for subsequent use;

[0050] The prepared third amidoxime-modified polyacrylonitrile nanofiber membrane bimetallic complex catalyst (referred to as Fe-Cu-AO-n-PANFM-3) is brown. Through measurement and calculation, the contents of iron ions and copper ions in the catalyst are 1.03mmol / g and 3.07mmol / g respectively.

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Abstract

The invention relates to an amidoxime-modified polyacrylonitrile nanofiber membrane bimetallic complex catalyst and a preparation method thereof. The catalyst is characterized in that a polyacrylonitrile nanofiber membrane is prepared by using an electrostatic spinning method; the catalyst consists of the amidoxime-modified polyacrylonitrile nanofiber membrane and an iron-ion and copper-ion double complexing reactant; the appearance of the catalyst is a brown even blue-green nanofiber membrane; the diameter of the polyacrylonitrile nanofiber is 610.5nm; the content of the iron ion and the content of the copper ion are respectively 1.03-3.15mmol / g and 1.01-3.07mmol / g. The preparation method comprises the following steps: (1) pretreating polyacrylonitrile yarns; (2) spinning the polyacrylonitrile nanofiber membrane; (3) pretreating the polyacrylonitrile nanofiber membrane; (4) performing amidoxime modification on the polyacrylonitrile nanofiber membrane; (5) preparing a metal ion mixed aqueous solution; (6) carrying out a complexing reaction between the amidoxime-modified polyacrylonitrile nanofiber membrane and the metal ions to obtain the amidoxime-modified polyacrylonitrile nanofiber membrane bimetallic complex catalyst. The catalyst consists of nanofibers and has higher activity and stability.

Description

technical field [0001] The invention relates to a chemical catalyst technology, in particular to a polyacrylonitrile nanofiber membrane bimetallic complex catalyst for promoting dye degradation in printing and dyeing wastewater and a preparation method thereof. Background technique [0002] Fenton oxidation is an effective method for removing pollutants such as dyes from wastewater, which is based on Fe 2+ and H 2 o 2 (commonly known as Fenton's reagent) an advanced oxidation technique that produces hydroxyl radicals that allow for rapid and complete degradation and mineralization of these pollutants. However, in the actual application of Fenton oxidation method, the pH value of the reaction system must be between 2-5, and after the reaction, iron ions will remain in the solution, causing secondary pollution. Therefore, the research and development of heterogeneous Fenton technology is the key to improve the Fenton oxidation method. In recent years, heterogeneous Fenton ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/22B01J35/06C02F1/72
Inventor 董永春赵雪婷程博闻康卫民李冰
Owner TIANJIN POLYTECHNIC UNIV
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