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Preparation method for hydrophilic oil-water separation membrane imitating cobweb structure

An oil-water separation membrane and hydrophilic technology, which is applied in the field of environmental protection and chemical separation, can solve the problems of multi-walled carbon nanotubes, such as easy self-agglomeration, poor mechanical processing performance, and low mechanical strength, to overcome low mechanical strength and effectively Hydrophilic modification, effective dispersion effect

Active Publication Date: 2018-11-23
江阴智产汇知识产权运营有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the deficiencies in the above-mentioned prior art, the purpose of the present invention is to overcome the defects of multi-walled carbon nanotubes that are easy to self-agglomerate, poor machining performance, and low mechanical strength after film formation, and provide a simple process, low cost, simple operation and Preparation method of hydrophilic oil-water separation membrane imitating spider web structure capable of large-scale production

Method used

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  • Preparation method for hydrophilic oil-water separation membrane imitating cobweb structure

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Effect test

Embodiment 1

[0030] A preparation method of a hydrophilic oil-water separation membrane imitating a spider web structure, comprising the steps of:

[0031] a) Dispersion of multi-walled carbon nanotubes: add 0.5 mL of perchloric acid per gram of multi-walled carbon nanotubes, react the mixture at 120 °C for 6 h, and deionize the obtained multi-walled carbon nanotubes Rinse with water 10 times until the pH is neutral, and dry in a vacuum oven at 60 °C for 5 h. Add 0.5 g of dispersed multi-walled carbon nanotubes per liter of water to obtain a black liquid. The black liquid was ultrasonically oscillated for 5 h to obtain a fully dispersed multi-walled carbon nanotube dispersion;

[0032] b) Purification of the dispersion of multi-walled carbon nanotubes: centrifuging and purifying the obtained multi-walled carbon nanotubes dispersion at 9000 rad / min for 30 min, and taking the supernatant to obtain a completely dispersed multi-walled carbon nanotubes dispersion;

[0033] c) Preparation of h...

Embodiment 2

[0036] A preparation method of a hydrophilic oil-water separation membrane imitating a spider web structure, comprising the steps of:

[0037] a) Dispersion of multi-walled carbon nanotubes: add 5 mL of nitric acid per gram of multi-walled carbon nanotubes, react the mixture at 140 °C for 3 h, and rinse the obtained multi-walled carbon nanotubes with deionized water 10 times until the pH was neutral, and dried in a vacuum oven at 80°C for 3 h. Add 1 g of dispersed multi-walled carbon nanotubes per liter of water to obtain a black liquid. The black liquid was ultrasonically oscillated for 8 h to obtain a fully dispersed multi-walled carbon nanotube dispersion;

[0038] b) Purification of the dispersion of multi-walled carbon nanotubes: centrifuging and purifying the obtained multi-walled carbon nanotubes dispersion at 10,000 rad / min for 20 min, and taking the supernatant to obtain a completely dispersed multi-walled carbon nanotubes dispersion;

[0039] c) Preparation of hydr...

Embodiment 3

[0042] A preparation method of a hydrophilic oil-water separation membrane imitating a spider web structure, comprising the steps of:

[0043] a) Dispersion of multi-walled carbon nanotubes: 3 mL of concentrated sulfuric acid was added to each gram of multi-walled carbon nanotubes, and the mixture was reacted at 160 °C for 4 h, and the obtained multi-walled carbon nanotubes were deionized water Rinse 15 times until the pH is neutral, and dry in a vacuum oven at 80 °C for 5 h. Add 2 g of dispersed multi-walled carbon nanotubes per liter of water to obtain a black liquid. The black liquid was ultrasonically oscillated for 12 hours to obtain a completely dispersed multi-walled carbon nanotube dispersion;

[0044] b) Purification of the dispersion of multi-walled carbon nanotubes: centrifuging and purifying the obtained multi-walled carbon nanotubes dispersion at 12000 rad / min for 20 min, and taking the supernatant to obtain a completely dispersed multi-walled carbon nanotubes di...

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Abstract

The invention belongs to the technical field of chemical separation and environmental protection, and relates to a preparation method for a hydrophilic oil-water separation membrane imitating a cobwebstructure. The preparation method comprises the steps that multi-walled carbon nanotubes which are mutually intertwined are broken through inorganic acid at high temperature so as to obtain multi-walled carbon nanotube dispersion liquid, centrifuging and separating are carried out, and then supernate is taken; and 2-5 g of super-long MnO2 nanowires are added into per liter of water, mixed suspension liquid is stirred for 5-24 hours, the multi-walled carbon nanotube dispersion liquid and the super-long MnO2 nanowire dispersion liquid are mixed according to the volume ratio of 1:3-5:1 and thenare stirred, finally the multi-walled carbon nanotube / super-long MnO2 nanowire mixed solution is subjected to vacuum filtration in a vacuum filtration device with a commercial filtration membrane fixed so as to obtain a oil-water separation membrane imitating the cobweb structure, a hydrophilic filter membrane is peeled off, and drying is carried out so as to obtain the hydrophilic oil-water separation membrane imitating the cobweb structure. According to the preparation method, the super-long MnO2 nanowires are mutually intertwined so as to form a large-aperture supporting network, the multi-walled carbon nanotubes and the supporting network are mutually intertwined so as to form a small-aperture network structure, so that the cobweb structure is effectively imitated, and the purpose of enhancing the mechanical strength of the multi-walled carbon nanotube membrane is achieved.

Description

technical field [0001] The invention belongs to the technical fields of chemical separation and environmental protection, and relates to an oil-water separation membrane with a bionic structure, in particular to a method for preparing a hydrophilic oil-water separation membrane with a spider web structure. Background technique [0002] Due to the huge difference in surface tension between oil and water, filter membranes with special wettability have become an advanced means for treating oil-water mixtures. Currently, superhydrophobic separation membranes are commonly used in these membranes, which can achieve the separation effect of selective permeation and absorption of oil and repelling water in oil-water mixtures. However, since water has a higher density than oil, water tends to form a barrier layer on the surface of the hydrophobic membrane to prevent oil from penetrating. In addition, such membranes are easily fouled or even clogged by selectively permeable oils, res...

Claims

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Application Information

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IPC IPC(8): B01D71/02B01D69/02B01D67/00B01D17/022
CPCB01D17/02B01D67/0039B01D69/02B01D71/021B01D71/024B01D2325/36
Inventor 岳学杰张涛邱凤仙杨冬亚郭卿俞汉强荣坚
Owner 江阴智产汇知识产权运营有限公司
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