Fenton-like catalyst as well as preparation method and application thereof

A catalyst, Fenton's technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of serious mass loss of oxidized carbon nanotubes and damage to carbon nanotubes Problems such as the structure of the tube body and the limited catalytic effect of the catalyst can achieve the effects of improving catalytic reaction efficiency, high catalytic activity, considerable economic and environmental benefits

Active Publication Date: 2020-04-17
GUANGDONG ESQUEL TEXTILES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation method is more complicated
Since this method uses the functional group of the carbon nanotube wall as the site when supporting the catalyst active component, it will cause the active component loading rate to be low (the mass percent composition is 10%-15%), which may The catalytic effect of the catalyst will be limited
Not only that, this method explains that in the preparation process, carbon nanotubes need to be treated with a strong oxidant (such as concentrated nitric acid) at high temperature, and then washed and separated to obtain oxidized multi-walled carbon nanotubes. The reagents used in this process are dangerous and strong. Oxidizing reagents can destroy the body structure of carbon nanotubes
In addition, the mass loss of oxidized carbon nanotubes in the process of washing and purification is relatively serious, which brings a significant increase in the preparation cost
The above limitations are unfavorable in the actual preparation and industrial application of catalysts

Method used

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  • Fenton-like catalyst as well as preparation method and application thereof
  • Fenton-like catalyst as well as preparation method and application thereof
  • Fenton-like catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] This embodiment provides a Fenton-like catalyst, which is prepared through the following steps.

[0052] Dissolve 20mmol ferric chloride hexahydrate and 10mmol ferrous sulfate heptahydrate solid in 25mL of 0.12M dilute hydrochloric acid, stir at 400rpm, slowly add dropwise to 250mL ammonia solution at room temperature (concentration: 0.7M), in a water bath At 40° C., 7.2 g of tetramethylammonium hydroxide was added to the solution, and stirring was continued at 400 rpm for 2 hours to obtain a ferric oxide dispersion.

[0053] Add 5 mL of polydimethyldiallyl ammonium chloride (PDADMAC) solution to the ferric oxide solution to prepare a concentration of 0.05 mol L -1 The surface of the positively charged Fe 3 o 4 Dispersions.

[0054] Disperse 0.5 g of MWNTs in 150 mL of polystyrene sodium sulfonate (PSS, aq: 1 wt.%) solution, ultrasonically disperse at 400 W for 45 min, and stir at 400 rpm for 12 h to obtain a MWNTs / PSS dispersion.

[0055] Take 86.4 mL of positively...

Embodiment 2

[0059] This embodiment provides a Fenton-like catalyst, which is prepared through the following steps.

[0060] Dissolve 20mmol of ferric chloride hexahydrate and 10mmol of ferrous sulfate heptahydrate in 25mL of dilute hydrochloric acid with a concentration of 0.12M, and slowly add it dropwise to 250mL of ammonia solution at room temperature (concentration: 0.7M) under vigorous stirring at 500rpm. After completion, add 5.0 g of oleylamine into the solution in a water bath at 35° C., and continue stirring at 400 rpm for 2 hours to obtain a ferric oxide dispersion.

[0061] Add 5 mL of polydimethyldiallyl ammonium chloride (PDADMAC) solution to the ferric oxide solution to prepare a concentration of 0.05 mol L -1 The surface of the positively charged Fe 3 o 4 Dispersions.

[0062] Disperse 0.5g of MWNTs in 150mL of sodium polyacrylate (PSS, aq: 1wt.%) solution, ultrasonically disperse, and stir at 150rpm-500rpm for 12h to obtain a MWNTs / PSS dispersion.

[0063] Take 21.6mL ...

Embodiment 3

[0068] This embodiment provides a Fenton-like catalyst, which is prepared through the following steps.

[0069] Dissolve 20mmol ferric chloride hexahydrate and 10mmol ferrous sulfate heptahydrate solid in 25mL of 0.12M dilute hydrochloric acid, stir at 500rpm, slowly add dropwise to 250mL ammonia solution at room temperature (concentration: 0.7M), in a water bath At 45° C., 7.2 g of tetramethylammonium hydroxide was added to the solution, and stirring was continued at 400 rpm for 2 hours to obtain a ferric oxide dispersion.

[0070] Add 5 mL of polydimethyldiallyl ammonium chloride (PDADMAC) solution to the ferric oxide solution to prepare a concentration of 0.05 mol L -1 The surface of the positively charged Fe 3 o 4 Dispersions.

[0071] Disperse 0.5g of MWNTs in 150mL of sodium polystyrene sulfonate and sodium polyacrylate with a mass ratio of 1:1 (aq:1wt.%), disperse in an ultrasonic environment with a power of 300W, and stir at 350rpm for 12h to obtain MWNTs / PSS+ PAAS...

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Abstract

The invention provides a Fenton-like catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: preparing a positively charged ferroferricoxide dispersion liquid; preparing a negatively charged carbon nanotube dispersion liquid; preparing a composite dispersion liquid containing the ferroferric oxide dispersion liquid and the carbon nanotube dispersion liquid; and carrying out suction filtration on the composite dispersion liquid, washing until the pH value of an obtained filtrate is 7, and drying to obtain the Fenton-like catalyst.The preparation process is simple, the active component and the carrier are firmly combined, the controllable preparation of the high load rate catalyst active component is achieved, and the preparedcatalyst has characteristics of high organic pollutant degradation catalysis efficiency and easy and efficient recovery.

Description

technical field [0001] The invention relates to a method for preparing a catalyst, in particular to a method for preparing a Fenton-like catalyst, and belongs to the technical field of catalyst preparation. Background technique [0002] With the ever-expanding living needs brought about by the continuous growth of my country's population, industries such as printing and dyeing, electroplating, and papermaking have flourished. With the huge economic profits brought about by development, at present, 600-700 million tons of wastewater are discharged into the environment every year in the printing and dyeing industry alone, which poses a huge threat to the national and even global water environment security. Taking printing and dyeing wastewater as an example, its large discharge volume, complex composition, high concentration of chemical oxygen demand (COD) and biochemical oxygen demand (BOD), high chroma, and difficult degradation of organic pollutant components make it a diff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745B01J31/06C02F1/72C02F101/30C02F101/38
CPCB01J31/06B01J23/745C02F1/722C02F1/725C02F2305/026C02F2305/023C02F2101/38C02F2101/308
Inventor 张旋杜希左小新张玉高
Owner GUANGDONG ESQUEL TEXTILES CO LTD
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