Multi-walled carbon nanotube-loaded nano ferroferric oxide catalyst and preparation method and application thereof

A technology of multi-walled carbon nanotubes and ferroferric oxide, which is applied in the field of applied catalysis and the environment, to achieve high activity, improve utilization efficiency, and reduce use costs

Active Publication Date: 2012-09-19
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current hydrothermal (solvothermal) synthesis often uses toxic organic substances as reducing agents, such as benzene, hydrazine hydrate, etc., and the synthesized Fe 3 o 4 The particle size of nanoparticles is 20-60nm

Method used

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  • Multi-walled carbon nanotube-loaded nano ferroferric oxide catalyst and preparation method and application thereof
  • Multi-walled carbon nanotube-loaded nano ferroferric oxide catalyst and preparation method and application thereof
  • Multi-walled carbon nanotube-loaded nano ferroferric oxide catalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Embodiment 1, preparation of multi-walled carbon nanotube supported ferric oxide catalyst

[0049] After mixing 10mL of ethylene glycol with 2mL of water, add 0.1g of oxidized MWCNTs, 0.2g of Fe(acac) 3 , and then it was added to a stainless steel autoclave, nitrogen gas was introduced to exclude oxygen, and the lid was sealed. Put the reaction kettle in an oil bath, heat to 200°C at a heating rate of 3°C / min, and react at 200°C for 30 minutes, then continue to heat at a heating rate of 2°C / min to 260°C, and then react at 260°C 30min. After the reaction is completed, take out the reaction kettle from the oil bath and cool it down to room temperature naturally, add ethanol to wash 4-5 times, and vacuum-dry at 80°C for 24 hours, that is, the multi-walled carbon nanotubes loaded with iron tetroxide Fe 3 o 4 -MWCNTs.

[0050] Among them, the MWCNTs after the oxidation treatment are prepared according to the following steps: put 2 g of multi-walled carbon nanotubes MWCNT...

Embodiment 2

[0054] Example 2: Fe 3 o 4 -MWCNTs Catalyzed Degradation of Refractory Organic Pollutant Acid Orange II (AOII)

[0055] Fe 3 o 4 -The catalytic activity of MWCNTs was evaluated by the removal efficiency of degrading AOII. In 60mL 0.25mmol / LAOII aqueous solution, at first adjust the pH value to 3.5, then add 500mg / L embodiment 1 to prepare the obtained Fe 3 o 4 - 30mg of MWCNTs, keep the temperature in the water bath and keep stirring. Stir for 30 minutes before the reaction to make the adsorption balance, and then add 1.0mL concentration of 0.9molL -1 The hydrogen peroxide begins to trigger the reaction, and a small amount of mixture is taken out at regular intervals, and after centrifugation, the absorbance of the solution at 484nm is measured by spectrophotometry, and the UV-Vis spectrum changes in this AOII degradation are as follows: Figure 4 shown. According to the calculation formula of AOII removal efficiency:

[0056] D=(C 0 -C t / C 0 )×100% (12)

[0057]...

Embodiment 3

[0058] Example 3: Fe 3 o 4 -Comparative test of catalytic activity of MWCNTs

[0059] For powder Fe 3 o 4 , Nano Fe 3 o 4 , MWCNTs and Fe 3 o 4 - The catalytic activity of MWCNTs was compared. The same experimental conditions were used to catalytically degrade the AOII solution, and the removal efficiency was compared (the measurement and calculation method was the same as in Example 2). The experimental conditions are: the mass of catalyst in the solution is 500mg / L, the concentration of AOII is 0.25mmol / L, the pH value is 3.5, the H 2 o 2 The concentration is 15mmol / L, and the reaction time is 30min.

[0060] The result is as Figure 5 As shown, it can be seen from the figure that: with Fe 3 o 4 - MWCNTs and other quality powdered Fe 3 o 4 , Nano Fe 3 o 4 , the removal efficiencies of AOII were 15.4%, 37.1%, respectively, while Fe 3 o 4 -The removal efficiency of MWCNTs degraded AOII was 94.3%, and because MWCNTs only adsorbed and did not degrade AOII, the...

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Abstract

The invention discloses a multi-walled carbon nanotube-loaded nano ferrofferic oxide (Fe3O4) catalyst and a preparation method and an application thereof. In the multi-walled carbon nanotube-loaded nano ferrofferic oxide catalyst, ferroferric oxide is distributed on the surface of the outer wall of the multi-walled carbon nanotube. The preparation process is simple, the cost is low, and easiness in industrialized popularization is realized. In the synthesized catalyst, the crystallinity of the Fe3O4 nano particles is high, the particle size is controllable, and the particles distribution is narrow. The catalytic activity of the multi-walled carbon nanotube-loaded nano ferrofferic oxide (Fe3O4) catalyst multi-walled carbon nanotube-loaded nano ferrofferic oxide (Fe3O4) catalyst (Fe3O4-MWCNTs) is high and the Fe3O4-MWCNTs is easy for being repeatedly used through magnetic separation. The Fe3O4-MWCNTs which is prepared by the method can be used as peroxide mimic enzyme and can be used as catalyst for organic pollutants which are difficult to degrade and for organic synthesis.

Description

technical field [0001] The invention belongs to the field of applied catalysis and environment, and relates to a multi-walled carbon nanotube (MWCNTs for short) loaded nano ferric oxide catalyst, a preparation method and application thereof. Background technique [0002] Nano Fe 3 o 4 Because of its unique physical and chemical properties, it has the same properties as bulk Fe 3 o 4 different uses. Nano Fe 3 o 4 It has been used as a magnetic recording material, a magnetic fluid, a developer for nuclear magnetic resonance imaging, a drug carrier, and as a catalyst for organic synthesis and environmental governance. Fe 3 o 4 It is non-toxic, will not cause harm to the environment during use, and is easy to be reused by magnetic separation, so it has received special attention in practical applications. But nano-Fe 3 o 4 The particle size is small and has high surface energy, and its particles are easy to agglomerate, especially magnetic nanoparticles, which are eas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745A62D3/38A62D101/20
Inventor 文湘华邓景衡
Owner TSINGHUA UNIV
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