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Preparation method of three-dimensional metal mesh with preferential adsorption/separation performance

A separation performance, metal mesh technology, applied in separation methods, adsorption water/sewage treatment, liquid separation, etc., can solve the problems of high preparation cost, poor selectivity, low adsorption capacity, etc., and achieve simple preparation process route and reusability. Good, selective effect

Inactive Publication Date: 2013-09-25
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adsorption technology is an effective method to remove toxic industrial organic waste liquid or crude oil spill pollutants in water bodies, but traditional adsorption materials such as activated carbon, molecular sieves, diatomaceous earth, etc., generally have some shortcomings: (1) The adsorption capacity is relatively low Low, the adsorption capacity of oil and organic solvents is generally only several times to ten times (weight ratio); (2) Poor selectivity
On the one hand, the preparation cost of these superhydrophobic materials is relatively expensive, and the adsorption rate is limited. On the other hand, these materials are mostly two-dimensional structures, which limits their use in practice, especially in large-scale offshore oil spills.

Method used

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  • Preparation method of three-dimensional metal mesh with preferential adsorption/separation performance
  • Preparation method of three-dimensional metal mesh with preferential adsorption/separation performance
  • Preparation method of three-dimensional metal mesh with preferential adsorption/separation performance

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preparation example Construction

[0010] The present invention is a preparation method of a three-dimensional metal mesh with selective adsorption / separation performance, and its steps are:

[0011] (1) The nano-sheet thickness of graphene is coated on the metal grid by the dipping method to construct micro-nano-scale surface roughness, and then the low surface energy substance is coated on the graphene surface by the dipping method. Change its surface chemical energy to construct a two-dimensional metal grid with super-hydrophobic and super-lipophilic properties with a surface water contact angle of 150-155 degrees and an oil contact angle of 0 degrees;

[0012] (2) Lap at least two two-dimensional metal grids at an angle to form a three-dimensional three-dimensional metal grid.

[0013] According to the above In the method, graphene with a thickness of nano-sheets is coated on a metal grid by a dipping method to construct a micro-nano-scale surface roughness. The thickness of the graphene sheet is between 0.8-2 na...

Embodiment 1

[0020] Dissolve 30mg of graphite oxide in 10mL of distilled water and disperse ultrasonically for 30 minutes to prepare a 3mg / mL graphene oxide aqueous solution. According to the volume ratio of organic phase to water of 9:1, add 90mL of nitrogen and nitrogen-dimethylformamide to make 0.3mg / mL graphene oxide solution. Add 30 μL of hydrazine hydrate and react at 80° C. for 1 hour to obtain a graphene impregnation solution. A metal grid with a mesh size of 400 is selected as the substrate, immersed and dried at 80°C, and the graphene sheets are attached to the metal grid. Subsequently, the graphene-attached metal mesh was immersed in a 1 mg / ml polydimethylsiloxane toluene solution, and dried at 80°C for 12 hours to obtain a two-dimensional metal mesh with super hydrophobic and super lipophilic properties. Its SEM photo is like figure 1 As shown in the figure, it can be seen that the surface of the prepared two-dimensional metal mesh is attached with layered graphene to form a ...

Embodiment 2

[0022] The super-hydrophobic and super-lipophilic two-dimensional metal mesh obtained in Example 1 is made into a cubic or columnar metal mesh adsorption material by mechanical processing means. Figure 2~Figure 5 Shows the process diagram of the selective adsorption of organic matter in water by the cubic metal mesh. Image 6 Shows the dynamic selective adsorption diagram of the columnar metal mesh for organics in water. Figure 7 Shows the amount of adsorption of organic matter in water by the cubic metal mesh. Picture 8 Based on the surface water contact angle, it shows the repeatability of the cubic metal mesh in the application.

[0023] The contact angle of water on the surface of the superhydrophobic metal mesh prepared by the invention is 152 degrees, and the contact angle of oil is 6.7 degrees. It has selective adsorption capacity for oil and non-polar solvents in water (only oil or non-polar solvents are adsorbed, It does not absorb water) and has good reusability. It ca...

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Abstract

A preparation method of a three-dimensional metal mesh with preferential adsorption / separation performance comprises the following steps: (1) graphene with the nanosheet thickness is coated on a metal mesh by an immersion method so as to construct nanoscale surface roughness, and then a matter with low surface energy is coated on the graphene surface layer by an immersion method so as to change chemical energy of the surface and construct a super-hydrophobic super-lipophilic two-dimension metal mesh with surface water contact angle being 150-155 degrees and oil contact angle being zero degree; and (2) the at least two two-dimension metal meshes are angled and overlapped to form a stereo three-dimensional metal mesh.

Description

technical field [0001] The invention relates to environmental protection technology, in particular to the preparation of a three-dimensional metal net with selective adsorption / separation performance. Background technique [0002] The problem of environmental pollution has attracted the attention of countries all over the world. Adsorption technology is an effective method to remove toxic industrial organic waste liquid or crude oil spill pollutants in water bodies, but traditional adsorption materials such as activated carbon, molecular sieves, diatomaceous earth, etc., generally have some shortcomings: (1) The adsorption capacity is relatively low Low, the adsorption capacity of oil and organic solvents is generally only several times to ten times (weight ratio); (2) Poor selectivity. Although activated carbon or porous carbon can adsorb oil or organic solvents, it also has a certain adsorption capacity for water, so it is not ideal for oil (organic solvent) / water separat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F1/40B01D17/022
Inventor 李安朱照琪梁卫东孙寒雪
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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