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Preparation method of magnetic super-hydrophobic starch-based aerogel for oil-water separation

A starch-based and aerogel technology, which is applied in separation methods, liquid separation, chemical instruments and methods, etc., can solve the problems of poor dispersion of starch solutions, achieve excellent water and oil selective absorption, improve dispersibility, and prevent secondary pollution effect

Active Publication Date: 2022-04-05
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the remote control and recyclability of the adsorbent can generally be solved by composite nano-magnetic particles, but the magnetic particles tend to self-aggregate, and there is a problem of poor dispersion in the starch solution.

Method used

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  • Preparation method of magnetic super-hydrophobic starch-based aerogel for oil-water separation
  • Preparation method of magnetic super-hydrophobic starch-based aerogel for oil-water separation
  • Preparation method of magnetic super-hydrophobic starch-based aerogel for oil-water separation

Examples

Experimental program
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Effect test

Embodiment 1

[0063] A method for preparing magnetic superhydrophobic starch-based airgel, comprising the steps of:

[0064] (1) Preparation of nano starch:

[0065] Waxy cornstarch was dispersed in a buffer solution with pH 5.0, and heated and gelatinized at 95°C for 45min, wherein the concentration of waxy cornstarch in the buffer solution was 10.0wt%; then cooled to 55°C, with 30 ASPU per To measure the enzyme activity of dry starch, add pullulanase to the above solution, incubate at 55°C for 8 hours, then heat in boiling water to inactivate the enzyme, and centrifuge to get the supernatant; then put the supernatant at 4°C Recrystallize in medium for 8 hours, wash the obtained precipitate until neutral, and dry to obtain nano starch.

[0066] (2) Preparation of hydrophobic suspension:

[0067] Preparation cetyltrimethoxysilane concentration is that 1.5wt% and the absolute ethanol solution that ammoniacal liquor concentration is 10.0wt%, and in this solution, add immediately relative to...

Embodiment 2 16

[0079] The optimization of embodiment 2 cetyltrimethoxysilane

[0080] Step (2) in the adjustment embodiment 1 is:

[0081] Prepare cetyltrimethoxysilane concentration of 0.5, 1.0, 1.5, 2.0, 2.5wt% and ammonia concentration of 10.0wt% absolute ethanol solution, and immediately add relative to the amount of absolute ethanol to the solution is 1.5 wt% of the nano starch in step (1), stirred at 300rpm for 5 hours to obtain a hydrophobic suspension;

[0082] Others were consistent with Example 1 to obtain magnetic superhydrophobic starch-based airgel.

[0083] The obtained magnetic superhydrophobic starch-based airgel was tested, and the test results were as follows: Figure 4 :

[0084] From Figure 4 It can be seen that the water contact angles on the surface of the magnetic starch-based airgel prepared when the concentration of cetyltrimethoxysilane is 0.5, 1.0, 1.5, 2.0 and 2.5wt are 104.4°, 138.6°, 151.5°, respectively. °, 151.1° and 150.6°, the surface of the magnetic s...

Embodiment 3

[0085] The optimization of embodiment 3 nanometer starch

[0086] Step (2) in the adjustment embodiment 1 is:

[0087] Prepare a dehydrated ethanol solution with a hexadecyltrimethoxysilane concentration of 1.5wt% and an ammonia concentration of 10.0wt%, and immediately add 0.5, 1.0, 1.5, 2.0 and 2.5 wt% of the nano starch in step (1), stirred at 300rpm for 5 hours to obtain a hydrophobic suspension;

[0088] Others were consistent with Example 1 to obtain magnetic superhydrophobic starch-based airgel.

[0089] The obtained magnetic superhydrophobic starch-based airgel was tested, and the test results were as follows: Figure 5 :

[0090] From Figure 5It can be seen that the water contact angles on the surface of the magnetic starch-based airgel prepared when the concentration of nano-starch is 0.5, 1.0, 1.5, 2.0 and 2.5wt are 141.2°, 147.3°, 151.5°, 144.3° and 131.4° respectively. °, the sliding angles were 25.7°, 13.9°, 8.0°, 8.9° and 9.4°, respectively, and the surfac...

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Abstract

The invention discloses a preparation method of magnetic super-hydrophobic starch-based aerogel capable of being used for oil-water separation, and belongs to the field of oil-water separation. Nano starch prepared by an enzymolysis retrogradation method is modified by hexadecyltrimethoxysilane to serve as a super-hydrophobic coating, and then the surfaces of Fe3O4 magnetic nanoparticles prepared by a rapid coprecipitation method are modified by tetraethoxysilane and a KH560 silane coupling agent in sequence; and compounding the shell-core structure magnetic nanoparticles formed after modification with starch to prepare magnetic starch-based aerogel, and finally spraying a super-hydrophobic coating suspension onto the surface of the aerogel to prepare the magnetic super-hydrophobic starch-based aerogel. The magnetic super-hydrophobic starch-based aerogel disclosed by the invention shows excellent water-oil selective absorbability, namely oil-water separation characteristic, can be used for remotely controlling floating oil absorption under the guidance of a magnetic field, can be adsorbed and recycled by a magnet after oil absorption is finished, and shows huge potential of being applied to ocean leaked oil cleaning.

Description

technical field [0001] The invention relates to a preparation method of a magnetic superhydrophobic starch-based airgel that can be used for oil-water separation, and belongs to the field of oil-water separation. Background technique [0002] Oil is a necessary energy source for daily life and production, but frequent marine oil spill accidents in recent years have also attracted people's attention. The leaked oil contains toxic compounds such as benzene and toluene. These substances will quickly spread in the marine system under the action of ocean currents and waves, causing serious poisoning to lower algae to higher mammals, and will also bring harm to human society. Huge economic and energy losses. Among many traditional oil-water separation methods for cleaning up oil spills, physical adsorbents are widely used due to their relatively low cost and convenient operability. However, traditional physical adsorbents have low hydrophobic performance, low water-oil separatio...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F1/40C02F103/08
CPCY02A20/204B01J20/28B01J20/24B01J20/30C02F1/28C02F1/40C02F2103/08
Inventor 田耀旗王凡徐洁如詹锦玲金征宇麻荣荣邱立忠
Owner JIANGNAN UNIV
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