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Double-modification polyacrylonitrile fiber metal complex catalyst and preparation method thereof

A technology of polyacrylonitrile fibers and metal complexes, applied in the direction of organic compound/hydride/coordination complex catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of poor physical and mechanical properties and catalytic activity Problems such as too fast decline and low stability in use have achieved the effects of easy operation, easy industrial promotion, and many times of repeated use

Inactive Publication Date: 2012-01-04
TIANJIN POLYTECHNIC UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The outstanding performance of this type of photocatalyst is mainly manifested in its high catalytic activity and strong pH adaptability, but an important problem is that its use stability is not high, resulting in poor reusability, and its catalytic activity is significantly reduced when it is used for many times. The deterioration of mechanical properties limits its popularization and application in actual wastewater treatment
Although the polyacrylonitrile fiber bimetallic complex catalyst prepared by double coordination technology [see Dong Yongchun, etc., a polyacrylonitrile fiber bimetallic complex catalyst and its preparation method (application number: 200810151894.9)] can to a certain extent Solve this problem, but there are still shortcomings such as rapid decline in catalytic activity and low number of reuses during use, which affects the further development of this technology

Method used

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  • Double-modification polyacrylonitrile fiber metal complex catalyst and preparation method thereof
  • Double-modification polyacrylonitrile fiber metal complex catalyst and preparation method thereof
  • Double-modification polyacrylonitrile fiber metal complex catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 1. Pretreatment of polyacrylonitrile fiber: Wash the polyacrylonitrile fiber yarn with nonionic surfactant JFC aqueous solution containing volume concentration of 2.0g / L for 30 minutes, take it out, wash it twice with water, and dry it for later use.

[0041] 2. Hydrazine hydrate mixed modification reaction of polyacrylonitrile fiber: accurately weigh 10 grams of the pretreated polyacrylonitrile fiber, and immerse it in 250 milliliters of hydrazine hydrate with a volume concentration of 80 g / L and a volume concentration of 5 g / L In the aqueous solution of hydroxylamine hydrochloride, the ratio of polyacrylonitrile fiber weight (grams) to the volume (milliliters) of the aqueous solution is 1:25; then react at 93°C for 4 hours under stirring conditions, and after the reaction, the obtained brown mixture is modified The polyacrylonitrile fiber (M-PAN-1 for short) was taken out, washed 5 times with distilled water, weighed after drying, and its weight gain rate was 32.54%; ...

Embodiment 2

[0048] 1, 4 and 5 step processes are respectively the same as 1, 4 and 5 step processes in Example 1.

[0049] 2. Hydrazine hydrate mixed modification reaction of polyacrylonitrile fibers: accurately weigh 10 grams of the pretreated polyacrylonitrile fibers, and immerse them in hydrazine hydrate and 12g / L hydroxylamine hydrochloride aqueous solution whose volume concentration is respectively 65g / L to make the polyacrylonitrile fibers The ratio of the weight of acrylonitrile fiber (grams) to the volume (milliliters) of the aqueous solution is 1:25; then react for 3 hours at 82°C under stirring conditions, and the obtained brown mixed modified polyacrylonitrile fiber (abbreviated as M- PAN-2) was taken out, washed 5 times with distilled water, weighed after drying, and its weight gain rate was 25.86%;

[0050] 3. Sodium hydroxide partial hydrolysis reaction: first prepare 378 milliliters of molar concentration ratios and be the mixed solution of ethanol and water of 1: 5, and ad...

Embodiment 3

[0053] 1, 4 and 5 step processes are respectively the same as 1, 4 and 5 step processes in Example 1.

[0054] 2. Hydrazine hydrate mixed modification reaction of polyacrylonitrile fibers: accurately weigh 10 grams of the pretreated polyacrylonitrile fibers, and immerse them in hydrazine hydrate with a volume concentration of 40 g / L and in an aqueous solution of hydroxylamine hydrochloride with a volume concentration of 20 g / L , make the ratio of polyacrylonitrile fiber weight (gram) and the volume (milliliter) of aqueous solution be 1: 25; Then react 1.5 hours under 75 ℃ and stirring condition, the brown mixed modified polyacrylonitrile fiber ( Abbreviated as M-PAN-3) was taken out, washed 5 times with distilled water, dried and weighed, the weight gain rate was 18.47%;

[0055] 3. Sodium hydroxide partial hydrolysis reaction: first prepare 357 milliliters of molar concentration ratios and be the mixed solution of ethanol and water of 1: 5, and add the sodium hydroxide of 35....

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Abstract

The invention relates to a double-modification polyacrylonitrile fiber metal complex catalyst and a preparation method thereof. The catalyst consists of a complex of polyacrylonitrile fibers, iron ions and copper ions, wherein the complex is prepared by performing a mixed modification on 40 to 80 g / L solution of hydrazine hydrate and 5 to 20 g / L solution of hydroxylamine hydrochloride and performing partial hydrolysis modification on 60 to 100 g / L solution of sodium hydroxide; the iron ion content is 26.76 to 44.09 mg / g, and the copper ion content is 31.88 to 58.92 mg / g; and the catalyst has a color from brownish yellow to brownish green, and the dry state breaking strength and the hygroscopic state breaking strength are 15.28 to 22.54 N and 11.09 to 17.73 N respectively. The preparation method comprises the following steps of: 1, performing pretreatment on the polyacrylonitrile fibers; 2 performing a mixed modification reaction on the polyacrylonitrile fibers; 3, performing partial hydrolysis on the sodium hydroxide; 4, preparing aqueous solution of metal ions; and 5, performing a coordination reaction on double-modification polyacrylonitrile fiber and the metal ions.

Description

technical field [0001] The invention relates to chemical catalyst technology, in particular to a high-performance double-modified polyacrylonitrile fiber metal complex catalyst for promoting the degradation of organic pollutants such as dyes in printing and dyeing wastewater and a preparation method thereof. Background technique [0002] In 2008, the total discharge of wastewater in the country was about 57.2 billion tons, of which 24.2 billion tons were discharged from industrial wastewater, and the discharges of COD and ammonia nitrogen in industrial wastewater were 4.58 million tons and 300,000 tons, respectively. Among the various industries in the country, the top five industries with the largest amount of wastewater discharge are paper making, chemical manufacturing, electric power, ferrous metal smelting and textile printing and dyeing. Since 2001, the average annual growth rate of wastewater discharge from the textile printing and dyeing industry has been as high as ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/22C02F1/72C02F103/30
Inventor 董永春赵娟芝李冰刘春燕
Owner TIANJIN POLYTECHNIC UNIV
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