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Preparation method of three-dimensional macroporous carbon/carbon nanotube/titanium dioxide/silver composite material capable of catalytically degrading unsymmetrical dimethylhydrazine

A carbon nanotube, three-dimensional macroporous technology, applied in the environmental field, can solve the problems such as the catalyst cannot be effectively reused, the cost of sewage treatment is unbearable, and the recovery of nanoparticles is difficult, and achieves easy recovery, strong structure, and reduced band gap. Effect

Active Publication Date: 2015-07-22
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are some problems with this method: At present, when titanium dioxide micro-nanostructure materials are photocatalyzed to degrade pollutants, the smaller the size of titanium dioxide particles, the higher the catalytic efficiency
However, titanium dioxide nanoparticles can only be used in two ways, one is dispersed into sewage to form a suspension; the other is loaded onto a carrier or prepared into a porous material for use
The suspension of titanium dioxide nanoparticles can fully accept sunlight or artificial light sources, and the photocatalytic efficiency is relatively high, but the smaller the nanoparticles, the more difficult it is to recycle, which means that the catalyst cannot be effectively reused, resulting in waste water treatment. The cost is unaffordable, and if the nanoparticles cannot be recycled, it will cause secondary pollution to the water body
Porous materials or catalysts loaded on carriers generally exist in the form of thin films. Although they are easy to recycle, they have directional light reception. Only the catalyst particles on the surface can receive light energy. The place with large area is not conducive to the treatment of sewage under natural light conditions

Method used

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  • Preparation method of three-dimensional macroporous carbon/carbon nanotube/titanium dioxide/silver composite material capable of catalytically degrading unsymmetrical dimethylhydrazine
  • Preparation method of three-dimensional macroporous carbon/carbon nanotube/titanium dioxide/silver composite material capable of catalytically degrading unsymmetrical dimethylhydrazine
  • Preparation method of three-dimensional macroporous carbon/carbon nanotube/titanium dioxide/silver composite material capable of catalytically degrading unsymmetrical dimethylhydrazine

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Experimental program
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Effect test

Embodiment 1

[0029] 1. Preparation process:

[0030] 1. Disperse 0.5g of purchased acidified carbon nanotubes into 25g of a mixed solvent of ethanol and water with a volume ratio of 1:3, and disperse for 10 minutes under ultrasonic conditions with a power of 400W to obtain a carbon nanotube mixture. The concentration of carbon nanotubes in the nanotube mixture liquid is 2wt%.

[0031] 2. Weigh 10g of phenolic resin and 1g of curing agent hexamethylenetetramine and mix them with 40g of ethanol solvent. Under ultrasonic conditions with a power of 400W, after 30 minutes, a 20wt% mixture of phenolic resin is formed.

[0032] 3. Cut and weigh 1g of polyurethane foam template with a thickness of 4mm, first absorb the carbon nanotube mixture, then dry it at 60°C, then absorb the phenolic resin mixture, repeat 5 times, and ensure that the last time is to absorb Phenolic resin mixture until the template is cross-linked and solidified.

[0033] 4. Place the prepared composite foam in a pyrolysis f...

Embodiment 2

[0044] 1. Preparation process:

[0045] 1. Disperse 1.35g of purchased acidified carbon nanotubes into 25g of a mixed solvent of ethanol and water with a volume ratio of 1:2, and disperse for 10 minutes under ultrasonic conditions with a power of 400W to obtain a carbon nanotube mixture. The concentration of carbon nanotubes in the nanotube mixture liquid is 5wt%.

[0046] 2. Weigh 20g of phenolic resin and 2g of curing agent hexamethylenetetramine and mix them with 46g of ethanol solvent. Under ultrasonic conditions with a power of 400W, after 30 minutes, a 30wt% mixture of phenolic resin is formed.

[0047] 3. Cut and weigh 2.7g of a polyurethane foam template with a thickness of 4mm, first absorb the carbon nanotube mixture, then dry it at 60°C, then absorb the phenolic resin mixture, repeat 4 times, and ensure that the last time is Aspirate the phenolic resin mixture until the template is cross-linked and solidified.

[0048] 4. Place the prepared composite foam in a pyr...

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Abstract

The invention provides a preparation method of a three-dimensional macroporous carbon / carbon nanotube / titanium dioxide / silver composite material capable of catalytically degrading unsymmetrical dimethylhydrazine, relating to the technical field of environment. The preparation method comprises the following steps: carrying out carbon nanotube dispersion solution and phenolic resin solution deposition and carbonization activation by using a polymer foam template to prepare a three-dimensional macroporous carbon nanotube / activated carbon composite foam material, and modifying a silver-doped titanium dioxide nanoparticle layer on the surface. The used materials are green and environment-friendly. The preparation method is simple. The structure is firm. The macropores are beneficial to multi-azimuth lighting and water body circulation; the mesopores are beneficial to adsorbing unsymmetrical dimethylhydrazine; and the silver-doped titanium dioxide nanoparticles can photocatalytically degrade the unsymmetrical dimethylhydrazine. Thus, the composite material is hopeful to become a novel green water treatment material capable of photocatalytically degrading unsymmetrical dimethylhydrazine at high efficiency.

Description

technical field [0001] The invention belongs to the technical field of environment and relates to the technical field of preparation of purification materials. Background technique [0002] Unsymmetrical dimethylhydrazine is a high-energy fuel widely used in military applications such as missiles and rockets and in the civil aerospace industry, and is used as the main propellant fuel for rockets. Unsymmetrical dimethylhydrazine is highly toxic and volatile, causing air and water pollution and serious environmental problems. However, due to its excellent performance, it cannot be replaced by other fuels in the short term. With the vigorous development of manned spaceflight, moon landing program, satellite system and military industry, the consumption of unsymmetrical dimethylhydrazine is increasing, and the environmental problems caused by it can not be ignored and become an urgent problem to be solved. [0003] One of the chemical methods currently researched for the treat...

Claims

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Application Information

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IPC IPC(8): C02F1/30B01J23/50B01J35/10C02F101/38
CPCY02W10/37
Inventor 纪立军朱建
Owner YANGZHOU UNIV
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