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Amidoxime modified dual-scale polyacrylonitrile nanofiber-iron complex catalyst and preparation method thereof

A technology of polyacrylonitrile and iron complexes, applied in organic compound/hydride/coordination complex catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., to achieve easy industrial promotion, high catalytic efficiency, and pore structure Increased effect

Inactive Publication Date: 2017-03-15
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 dual-scale polyacrylonitrile nanofiber-iron complex catalyst and preparation method thereof
  • Amidoxime modified dual-scale polyacrylonitrile nanofiber-iron complex catalyst and preparation method thereof
  • Amidoxime modified dual-scale polyacrylonitrile nanofiber-iron complex catalyst and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0024] (1) Spinning of double-scale polyacrylonitrile nanofiber membrane: multi-needle electrospinning equipment is used to spin the fiber membrane, and two kinds of spinning solutions with mass fractions of 12% and 16% are stored in separate In the liquid storage tank for the liquid supply, the distance between the six needles and the receiving roller is kept consistent and in a straight line. Under the voltage of 18 kV, the extrusion rate of the spinning solution with a mass fraction of 12% is 0.7 mL / h, the extrusion rate of the spinning solution with a mass fraction of 16% is 1.2mL / h, and the spinning needle moves back and forth along the radial direction of the receiving roller at a horizontal distance of 15 cm from the grounded receiving roller, The double-scale polyacrylonitrile nanofiber membrane can be received on the surface of the roller, and vacuum-dried at 50° C. for 24 hours for use. The small-scale diameter is 127nm, and the large-scale diameter is 300nm.

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Embodiment 2

[0028] (1) Spinning of double-scale polyacrylonitrile nanofiber membrane: multi-needle electrospinning equipment is used to spin the fiber membrane, and two kinds of spinning solutions with mass fractions of 12% and 16% are stored in separate In the liquid storage tank for the liquid supply, the distance between the six needles and the receiving roller is kept consistent and in a straight line. Under the voltage of 15 kV, the extrusion rate of the spinning solution with a mass fraction of 12% is 0.5 mL / h, the extrusion rate of the spinning solution with a mass fraction of 16% is 1.5mL / h, and the spinning needle moves back and forth along the radial direction of the receiving roller at a horizontal distance of 10 cm from the grounded receiving roller, The double-scale polyacrylonitrile nanofiber membrane can be received on the surface of the roller, and it is vacuum-dried at 50° C. for 48 hours for use. The small-scale diameter is 220nm, and the large-scale diameter is 731nm. ...

Embodiment 3

[0031] (1) Spinning of dual-scale polyacrylonitrile nanofiber membrane: multi-needle electrospinning equipment is used to spin the fiber membrane, and two kinds of spinning solutions with mass fractions of 12% and 20% are stored separately in separate In the liquid storage tank for the liquid supply, the distance between the six needles and the receiving roller is kept consistent and in a straight line. Under the voltage of 20 kV, the extrusion rate of the spinning solution with a mass fraction of 12% is 0.5 mL / h, the extrusion rate of the spinning solution with a mass fraction of 20% is 0.9mL / h, and the spinning needle moves back and forth along the radial direction of the receiving roller at a horizontal distance of 15 cm from the grounded receiving roller, The double-scale polyacrylonitrile nanofiber membrane can be received on the surface of the roller, and it is vacuum-dried at 50° C. for 48 hours for use. The small-scale diameter is 175nm, and the large-scale diameter i...

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Abstract

The invention relates to an amidoxime modified dual-scale polyacrylonitrile nanofiber-iron complex catalyst and a preparation method thereof. The catalyst is characterized in that a multi-needle electrospinning method is firstly adopted to prepare two kinds of dual-sacle polyacrylonitrile nanofiber membranes formed by overlapping of fiber more than 100nm in diameter size difference in layers, the catalyst 3.15-4.81mmol / g in content of iron ions is obtained via complexing reaction of modified amidoxime and the iron ions, and the small-scale fiber of the dual-scale polyacrylonitrile nanofiber membranes is 127-220nm in diameter while the large-scale fiber of the dual-scale polyacrylonitrile nanofiber membranes is 300-985nm in diameter. The preparation method includes: 1), performing spinning of the dual-scale polyacrylonitrile nanofiber membranes; 2), performing amidoxime modification of the dual-scale polyacrylonitrile nanofiber membranes; 3), performing complexing reaction of the amidoxime modified dual-scale polyacrylonitrile nanofiber membranes and the iron ions to obtain the amidoxime modified dual-scale polyacrylonitrile nanofiber membrane-iron complex catalyst. The catalyst is formed by the dual-scale nanofiber membranes, and high iron ion use level, activity and stability are achieved.

Description

technical field [0001] The invention relates to a chemical catalyst technology, in particular to a double-scale polyacrylonitrile nanofiber iron complex catalyst for promoting dye degradation in printing and dyeing wastewater and a preparation method thereof. Background technique [0002] In recent years, with people's attention to the living environment, a variety of technical means for the treatment of water pollution have developed rapidly. The heterogeneous Fenton technology has the characteristics of a wide range of pH and easy recycling. It has become a research topic in the oxidation degradation of organic pollutants One of the hot spots. Among them, the heterogeneous Fenton catalyst prepared by using polyacrylonitrile fibers and nanofibers as iron ion loading materials has attracted people's attention, and has been applied in the oxidative degradation process of dye wastewater [see 1.Ishtchenko V V, etc., modified poly Preparation of acrylonitrile fiber catalyst and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/22B01J35/06C02F1/72C02F101/30C02F103/30
CPCC02F1/725B01J31/1691C02F2101/308C02F2103/30B01J35/59
Inventor 董永春李甫康卫民程博闻
Owner TIANJIN POLYTECHNIC UNIV