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Modified Teflon fiber metal complex catalyst and preparation method thereof

A technology of polytetrafluoroethylene and fiber metal, which is applied in the field of polytetrafluoroethylene fiber metal complex catalysts and preparation, can solve the problems of modified polyacrylonitrile fiber catalyst limitations, easy metal ions falling off, and insufficient chemical stability. Achieve the effects of easy industrialization, excellent mechanical strength, and excellent mechanical strength

Inactive Publication Date: 2013-06-05
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the lack of chemical stability of polyacrylonitrile fibers, in the degradation reaction of pollutants, the chemical structure of its surface changes, which not only leads to the deterioration of mechanical strength, but also the metal ions with catalytic function are easy to fall off, and this phenomenon Especially in acidic conditions
In addition, when the modified polyacrylonitrile fiber catalyst with high metal ion content is prepared, although it has strong catalytic activity, its physical and mechanical strength is very poor, sometimes it can hardly be used, and it is difficult to improve catalytic activity and maintain physical and mechanical properties. balance between
Although this phenomenon can be improved to a certain extent by double modification technology [see Dong Yongchun et al., a double modified polyacrylonitrile fiber metal complex catalyst and its preparation method (Patent No. ZL20101046990.1)], but in In practical applications, the modified polyacrylonitrile fiber catalyst may still be greatly restricted, affecting its use efficiency

Method used

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  • Modified Teflon fiber metal complex catalyst and preparation method thereof
  • Modified Teflon fiber metal complex catalyst and preparation method thereof
  • Modified Teflon fiber metal complex catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1. Pretreatment of polytetrafluoroethylene fibers: at room temperature and under stirring conditions, first wash and treat the polytetrafluoroethylene fibers with an aqueous solution of non-ionic surfactant with a volume concentration of 2.0g / L for 10 minutes, take them out, wash them with water and dry them , and then use acetone to clean the polytetrafluoroethylene fiber for 10 minutes, take it out and dry it in vacuum at 50°C for 24 hours before use;

[0038] 2. the acrylic acid graft modification reaction of polytetrafluoroethylene fiber: accurately weigh the described pretreated polytetrafluoroethylene fiber of design weight, and its immersion volume concentration is the acrylic acid monomer of 360g / L and volume concentration is 16g / L ferrous ammonium sulfate mixed aqueous solution. The ratio of the polytetrafluoroethylene weight (grams) to the volume (milliliters) of the mixed aqueous solution is 1: 30; then feed nitrogen into the system for 10 minutes to drive aw...

Embodiment 2

[0043] 1. Pretreatment of polytetrafluoroethylene fibers: at room temperature and under stirring conditions, first wash and treat the polytetrafluoroethylene fibers with an aqueous solution of non-ionic surfactant with a volume concentration of 4.0g / L for 10 minutes, take them out, wash them with water and dry them ; Then use acetone to clean the polytetrafluoroethylene fiber for 20 minutes, take it out and dry it in vacuum at 60°C for 36 hours before use;

[0044] 2. The acrylic acid graft modification reaction of polytetrafluoroethylene fiber: accurately weigh the described pretreatment polytetrafluoroethylene fiber of design weight, and it is immersed in the acrylic acid monomer that volume concentration is 420g / L and volume concentration is 18g Graft modification in the ferrous ammonium sulfate mixed aqueous solution of / L; The ratio of the polytetrafluoroethylene weight gram to the volume milliliter of the mixed aqueous solution is 1:30; Then feed nitrogen into the system ...

Embodiment 3

[0049] 1. The 1st step process of embodiment 3 is identical with the 1st step process among the embodiment 1;

[0050] 2. the 2nd step process of embodiment 3 is adjusted to 500g / L and 20g / L respectively by the acrylic acid in the 2nd step process of embodiment 1 and ferrous ammonium sulfate volumetric concentration, and Co 60 The γ-ray radiation treatment time is adjusted to 100h, and all the other are the same as the second step process in Example 1. After the reaction, the light red graft modified polytetrafluoroethylene fiber is abbreviated as PAA-g-PTFE-3;

[0051] 3. The 3rd step process of embodiment 3 adjusts the molar concentration ratio of iron ion and copper ion in the metal ion mixed aqueous solution described in the 3rd step process of embodiment 1 to 1: 3, i.e. ferric chloride aqueous solution and copper sulfate aqueous solution The volume concentrations are 0.025mol / L and 0.075mol / L, respectively. All the other are with the 3rd step process among the embodiment...

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Abstract

The invention discloses a modified Teflon fiber metal complex catalyst and a preparation method thereof. According to the method, teflon fiber is graft-modified with a mixed water solution of crylic acid with the volume concentration of 300-500g / L and ammonium ferrous sulfate with the volume concentration of 15-50g / L, and then the modified fiber reacts with 0.025-0.075mol / L ferric ion and 0.025-0.07mol / LCu ion to generate a complex which is the catalyst, wherein the content of the ferric ion is 46.43-125.1mg / g, and the content of the Cu ion is 78.54-110.2mg / g; and the crack intensities of thecatalyst in dry state and wet state are respectively 91.25-92.56N and 91.11-91.79N. The preparation method comprises the following steps: 1. pre-treating the fiber; 2. graft-modifying the fiber; 3. preparing a metal ion mixed water solution; and 4. carrying out complexing reaction on the graft-modified fiber and the metal ion.

Description

technical field [0001] The invention relates to catalyst technology, in particular to an acrylic acid graft-modified polytetrafluoroethylene fiber metal complex catalyst and a preparation method. Background technique [0002] Fenton oxidation technology is an industrial wastewater treatment technology with bright development prospects, using iron ions to H 2 o 2 The decomposition reaction produces strong oxidizing hydroxyl radicals, which completely degrade organic pollutants such as dyes that are difficult to biodegrade in water, effectively avoiding the shortcomings of some treatment technologies that only transfer pollutants. However, the Fenton oxidation technology must be used under acidic conditions (pH=2-5), so it is greatly limited in practical application: not only will the process and cost be increased due to the adjustment of the pH value, but also the iron remaining in the water body after the reaction is over Ions can cause secondary pollution. Therefore, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/22B01J35/06B01J37/00C02F1/72C02F103/30
Inventor 董永春丁志忠李冰
Owner TIANJIN POLYTECHNIC UNIV
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