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Super-hydrophilic/underwater super-oleophobic copper net and preparation method thereof, and application of super-hydrophilic/underwater super-oleophobic copper net in separation of emulsified oil-in-water

An underwater super-oleophobic and super-hydrophilic technology, applied in the fields of chemical engineering and super-hydrophilic materials, can solve problems such as low flux and separation efficiency, and achieve improved surface energy, excellent durability, and guaranteed permeation flux. Effect

Active Publication Date: 2020-11-24
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Document 1 (Xinjuan Zeng et al., A cross-linked coating decorated meshprepared by brush-painting method for oil-in-water emulsions separation, Materials Chemistry and Physics.) reported a method for brushing polyvinyl alcohol / glutaraldehyde / attapulgite / titanium dioxide to prepare super-hydrophilic / underwater super-oleophobic stainless steel mesh, the separation efficiency shows a satisfactory effect of 97.5% under the guarantee of small pore size, but the flux is less than 50L m -2 h -1 ultra-low flux
Literature 2 (YueeChen et al., A Co 3 o 4 nano-needle mesh for highly efficient, high-flux emulsion separation, Journal of Materials Chemistry A.) reported a method of depositing nano-sized needle-like Co on stainless steel mesh 3 o 4 The super-hydrophilic / underwater super-oleophobic stainless steel mesh, although the separation efficiency is all greater than 99%, but the permeation flux is only 160-340L m -2 h -1
Document 3 (Xinyu Chen et al., Durable and stable MnMoO 4 -coated copper mesh for highly efficient oil-in-water emulsion separation and photodegradation of organic contaminants, ACS Applied Materials & Interfaces.) reported a superhydrophilic / underwater superoleophobic copper mesh prepared by manganese molybdate coating, separation The highest efficiency can be as high as 99.9%, but the permeation flux is shown to be less than 200L m -2 h -1
If the pore size is kept large, the separation efficiency will be greatly affected

Method used

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  • Super-hydrophilic/underwater super-oleophobic copper net and preparation method thereof, and application of super-hydrophilic/underwater super-oleophobic copper net in separation of emulsified oil-in-water
  • Super-hydrophilic/underwater super-oleophobic copper net and preparation method thereof, and application of super-hydrophilic/underwater super-oleophobic copper net in separation of emulsified oil-in-water
  • Super-hydrophilic/underwater super-oleophobic copper net and preparation method thereof, and application of super-hydrophilic/underwater super-oleophobic copper net in separation of emulsified oil-in-water

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The 400-mesh phosphorus copper mesh (size 3cm×3cm) was ultrasonically cleaned with acetone, absolute ethanol and deionized water for 10 minutes, and dried with nitrogen for use; ) solution, add 0.25g / L dopamine and 0.78g / L PEI, ultrasonically shake in a water bath for 5min, then add 0.2g / L MWCNTs-NH 2 , continue ultrasonication for 5 minutes to obtain the dipping solution; soak the cleaned copper grid in the above dipping solution, transfer the whole system to the shaker, set the rotation speed of the shaker to 120rpm, the dipping time is 6h, and the dipping temperature 25°C; after taking it out, dry it in an oven at a drying temperature of 100°C and a drying time of 10 minutes to obtain a superhydrophilic / underwater superoleophobic copper mesh.

[0054] figure 1 It is a scanning electron microscope (SEM) picture of the 400-mesh phosphor copper mesh that has only been cleaned in the present invention. figure 1 It can be seen that the pore size of the unmodified copper...

Embodiment 2

[0060] The 400-mesh phosphorus copper mesh (size 3cm×3cm) was ultrasonically cleaned with acetone, absolute ethanol and deionized water for 10 minutes, and dried with nitrogen for use; ) solution, add 0.25g / L of dopamine and 0.78g / L of PEI, ultrasonically shake in a water bath for 5min, and then add 0.25g / L of MWCNTs-NH 2 , and continue ultrasonication for 5 minutes to obtain the dip coating solution; soak the cleaned copper grid in the above dip coating solution, transfer the whole system to the shaking table, set the rotation speed of the shaking table to 120rpm, dip the coating time to 8h, dip coating temperature 25°C; after taking it out, dry it in an oven at a drying temperature of 100°C and a drying time of 10 minutes to obtain a superhydrophilic / underwater superoleophobic copper mesh.

Embodiment 3

[0062] A 400-mesh phosphorus copper mesh (size 3cm×3cm) was ultrasonically cleaned with acetone, absolute ethanol, and deionized water for 10 min, and dried with nitrogen for use; ) solution, add 0.30g / L dopamine and 0.85g / L PEI, ultrasonically shake in a water bath for 5min, then add 0.25g / L MWCNTs-NH 2 , continue ultrasonication for 5 minutes to obtain the dip coating solution; soak the cleaned copper grid in the above dip coating solution, transfer the whole system to the shaking table, set the rotation speed of the shaking table to 130rpm, dip the coating time to 10h, dip coating temperature 30°C; take it out and dry it in an oven at a drying temperature of 120°C and a drying time of 30 minutes to obtain a superhydrophilic / underwater superoleophobic copper mesh.

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Abstract

The invention discloses a super-hydrophilic / underwater super-oleophobic copper net and a preparation method thereof, and application of the super-hydrophilic / underwater super-oleophobic copper net inseparation of emulsified oil-in-water. The preparation method comprises the following steps: ultrasonically cleaning a copper net with acetone, ethyl alcohol and deionized water separately, and then drying the copper net; preparing a composite dip-coating solution of polydopamine, polyethyleneimine and aminated carbon nanotubes; immersing the whole pre-cleaned copper net into the dip-coating solution; then putting the whole dip-coating solution system including the copper net on a shaking table for horizontal-rotary coating operation; and taking out the copper net, cleaning the copper net withdeionized water, and drying the copper net. The preparation method has the advantages of simple preparation technology, low raw material consumption, mild reaction conditions and harmlessness to theenvironment, and the obtained super-hydrophilic / underwater super-oleophobic copper net is resistant to physical wear and chemical corrosion and has the function of quickly and efficiently separating various emulsified oil-in-water such as methylbenzene, petroleum ether, isooctane and 1,2-dichloroethane.

Description

technical field [0001] The invention relates to a superhydrophilic / underwater superoleophobic material, in particular to a method for preparing a superhydrophilic / underwater superoleophobic copper mesh used for separating emulsified oil-in-water, belonging to chemical engineering and superophilic field of water materials. Background technique [0002] In the past ten years, the frequent occurrence of oil spill accidents and the increase of oily wastewater discharge have undoubtedly caused serious threats to the ecological environment and human health. Therefore, it is particularly important to develop an advanced material for treating these oily wastewaters, especially highly stable emulsified oily water containing surfactants. With the rapid development of materials with special wetting properties, fast, efficient, low energy consumption, and environmentally friendly superhydrophilic / underwater superoleophobic materials have become popular materials for oil-water separatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D179/02C09D179/04C09D7/62C09D7/63B05D1/18B05D7/24B01D17/00B01D17/04
CPCC09D179/02C09D7/62C09D7/63B05D1/18B05D7/24B01D17/10B01D17/04C08K2201/011C08L79/04C08K9/02C08K9/08C08K3/041C08K5/17
Inventor 皮丕辉左继浩刘子涵徐守萍文秀芳程江
Owner SOUTH CHINA UNIV OF TECH
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