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High-flux super-hydrophobic wood as well as preparation method and application thereof

A super-hydrophobic, high-throughput technology, applied in separation methods, chemical instruments and methods, and other chemical processes, can solve the problems of cumbersome preparation of super-hydrophobic materials, non-renewable materials, and low separation efficiency, and achieve low equipment requirements , application operation is simple, the effect of high separation efficiency

Pending Publication Date: 2021-10-15
DONGGUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the reported superhydrophobic materials for oil-water separation have problems such as cumbersome preparation process, external driving force, low separation efficiency, high cost, high energy consumption, non-renewable materials, and easy to cause secondary pollution.

Method used

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  • High-flux super-hydrophobic wood as well as preparation method and application thereof
  • High-flux super-hydrophobic wood as well as preparation method and application thereof
  • High-flux super-hydrophobic wood as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] First, set the density to 120kg / m 3 Put the wood into a mixed solution of 25mol / L sodium hydroxide and 5mol / L sodium sulfite, that is, the mass ratio of sodium hydroxide to sodium sulfite is 5:1, then place it in an oil bath and heat it at 100°C for 8h, take it out and wash it with clean water Wash three times; then, put the wood in a 25mol / L hydrogen peroxide solution, heat it in an oil bath at 100°C for 0.5h, take it out and wash it three times with clean water, then put the wood in the refrigerator to freeze for 10h, Then put it in a freeze-drying box for 6 hours; finally, use tetrahydrofuran as a solvent to prepare a 10wt% polydimethylsiloxane solution, then put it into the above wood, take it out and cure it at 100°C for 3 hours, and then obtain a high-throughput superhydrophobic wood.

[0028] figure 1 Infrared spectra of the high-throughput superhydrophobic wood prepared in Example 1 and the original wood. Compared with the original wood, superhydrophobic wood...

Embodiment 2

[0032] First, set the density to 140kg / m 3 Put the wood into a mixed solution of 20mol / L sodium hydroxide and 5mol / L sodium sulfite, that is, the mass ratio of sodium hydroxide to sodium sulfite is 4:1, then place it in an oil bath and heat it at 100°C for 7h, take it out and wash it with clean water Wash three times; then, put the wood in a 20mol / L hydrogen peroxide solution, heat it in an oil bath at 100°C for 1 hour, take it out and wash it three times with water, put the wood in the refrigerator to freeze for 10 hours, and then Put it in a freeze-drying box for 5 hours; finally, use acetone as a solvent to prepare a 5wt% polydimethylsiloxane solution, then put the above wood, take it out and cure it at 90°C for 3 hours, and then the high-throughput superhydrophobic wood is obtained. .

[0033] Use a contact angle measuring instrument to measure the contact angle of superhydrophobic wood, and the available contact angle is 154 °, and the experiment is carried out according...

Embodiment 3

[0035] First, set the density to 150kg / m 3 Put the wood into a mixed solution of 10mol / L sodium hydroxide and 10mol / L sodium sulfite, that is, the mass ratio of sodium hydroxide to sodium sulfite is 1:1, then place it in an oil bath and heat it at 100°C for 10h, take it out and wash it with clean water Wash three times; then, put the wood in a 15mol / L hydrogen peroxide solution, heat it in an oil bath at 100°C for 1.5 hours, take it out and wash it three times with clean water, and then put the wood in the refrigerator to freeze for 10 hours. Then put it in a freeze-drying box for 8 hours; finally, use toluene as a solvent to prepare a 2wt% polydimethylsiloxane solution, put it into the above wood, take it out and cure it at 80°C for 6 hours, and then obtain a high-flux superhydrophobic wood.

[0036] Use a contact angle measuring instrument to measure the contact angle of superhydrophobic wood, and the available contact angle is 155°, and the experiment is carried out accord...

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Abstract

The invention relates to the field of super-hydrophobic materials, and in particular, relates to a preparation method of high-flux super-hydrophobic wood, wherein the preparation method comprises the following steps: firstly, putting wood into a mixed solution of sodium hydroxide and sodium sulfite, heating at the temperature of 80-100 DEG C for 6-12 hours to remove part of hemicelluloses and lignin, putting the mixture into a hydrogen peroxide solution, and heating at the temperature of 80-100 DEG C for 0.5-2.5 hours to further remove lignin; and then, freezing the wood and carrying out freeze drying for 4-10 hours, then soaking the wood in a 2-20 wt% polydimethylsiloxane solution, taking out the wood and curing for 3-6 hours at the temperature of 60-100 DEG C, and thus obtaining the high-flux super-hydrophobic wood. The contact angle of water drops on the surface of the prepared super-hydrophobic wood can reach 156 degrees, the super-hydrophobic wood is of a vertically-arranged and large-aperture porous structure, high-flux oil-water separation can be rapidly carried out under the driving of gravity, and the separation flux can reach 7165 L*m<-2>*H<-1>; and compared with a traditional oil-water separation material, the wood has the advantages of being excellent in performance, easy to prepare, natural, renewable, low in application energy consumption and the like.

Description

technical field [0001] The invention relates to the field of superhydrophobic materials, in particular to a high-throughput superhydrophobic wood, its preparation method and its application. Background technique [0002] Oily wastewater has a wide range of sources and a large amount of discharge, causing serious harm to the ecological environment of water. In order to ensure the safety of water resource environment and the sustainable development of society, efficient and low-cost oil-water separation technology is a current research hotspot. At present, gravity sedimentation, centrifugal separation, air flotation, chemical flocculation and other methods are mostly used in the treatment of oily wastewater, but there are complex and cumbersome processes, large equipment, high investment and operation costs, high energy consumption, low efficiency, and easy to cause secondary pollution. and other shortcomings. [0003] Superhydrophobic material is a material designed inspire...

Claims

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Application Information

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IPC IPC(8): B01J20/28B01J20/30B01D17/022C02F1/28
CPCB01J20/28011B01J20/3078B01J20/3085B01D17/0202C02F1/28B01J2220/4825
Inventor 吴文剑陈卓瀚苏晓竞李坤泉
Owner DONGGUAN UNIV OF TECH
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