Nano-silica/nanofiber oil-water separation composite membrane and preparation method thereof

A nano-silica and nano-fiber technology, applied in the field of membrane engineering, can solve problems such as repeated or long-term continuous use, inapplicability to large-scale production and use, poor anti-pollution ability, etc., to increase strength and strengthen ability, hydrophilicity improvement effect

Active Publication Date: 2019-10-08
WUHAN TEXTILE UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Secondly, the existing oil-water separation membranes are expensive to manufacture, heavy metals, fluorine-containing compounds or other toxic and harmful components are introduced during the preparation process, and many follow-up problems such as environmental pollution are likely to occur, and they are not suitable for large-scale industrial production and use.
Finally, the existing oil-water separation membranes have poor stability and poor anti-pollution ability, and the membrane pores are easily blocked, so they cannot be used repeatedly or continuously for a long time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The preparation method of nano silicon dioxide / nano fiber oil-water separation composite membrane comprises the following steps:

[0029] 1) Preparation of nano-silica solution

[0030] The hydrophilic nano-silica particles are mixed with polyacrylamide and then dissolved in an ethanol solvent to obtain a nano-silica solution; wherein the mass ratio of the hydrophilic nano-silica particles to polyacrylamide is 2:8.

[0031] 2) Preparation of nanofiber suspension

[0032] The polyvinyl alcohol (PVA) nanofibers processed by the high-speed shearing machine are dispersed in an ethanol solvent to obtain a nanofiber suspension; the mass percent concentration of the PVA nanofibers in the nanofiber suspension is 0.5%.

[0033] 3) Preparation of nano-silica / nanofiber oil-water separation composite membrane

[0034] The nano-silica solution and the nanofiber suspension are mixed uniformly by a high-speed disperser to obtain a film-forming liquid. The mass ratio of the nano-sili...

Embodiment 2

[0037] The preparation method of nano silicon dioxide / nano fiber oil-water separation composite membrane comprises the following steps:

[0038] 1) Preparation of nano-silica solution

[0039] The hydrophilic nano-silica particles and polyvinylpyrrolidone are mixed and then dissolved in acetic acid solvent to obtain a nano-silica solution; wherein the mass ratio of the hydrophilic nano-silica particles to the polyvinylpyrrolidone is 9:1.

[0040] 2) Preparation of nanofiber suspension

[0041] Disperse the polyethylene glycol (PEG) nanofibers treated by the high-speed shearing machine in an acetic acid solvent to obtain a nanofiber suspension; the mass percentage concentration of the PEG nanofibers in the nanofiber suspension is 60%.

[0042] 3) Preparation of nano-silica / nanofiber oil-water separation composite membrane

[0043] The nano-silica solution and the nanofiber suspension are mixed uniformly by an emulsifier to obtain a film-making solution. The mass ratio of the na...

Embodiment 3

[0046] The preparation method of nano silicon dioxide / nano fiber oil-water separation composite membrane comprises the following steps:

[0047] 1) Preparation of nano-silica solution

[0048] The hydrophilic nano-silica particles are mixed with polyvinyl alcohol and then dissolved in an acetone solvent to obtain a nano-silica solution; wherein the mass ratio of the hydrophilic nano-silica particles to polyvinyl alcohol is 1:3.

[0049] 2) Preparation of nanofiber suspension

[0050] The polyacrylic acid (PAA) nanofibers treated by the high-speed shearing machine were dispersed in methanol solvent to obtain a nanofiber suspension; the mass percentage concentration of the PAA nanofibers in the nanofiber suspension was 10%.

[0051] 3) Preparation of nano-silica / nanofiber oil-water separation composite membrane

[0052] The nano-silica solution and the nanofiber suspension are uniformly mixed by a high-speed disperser to obtain a film-forming liquid, and the mass ratio of the ...

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Abstract

The invention relates to the technical field of film engineering and particularly relates to a nano-silicon dioxide / nano-fiber oil-water separation composite film and a preparation method thereof. The preparation method comprises the following steps: (1) preparing a nano-silicon dioxide liquid: mixing nano-silicon dioxide particles and a water-soluble polymer, and dissolving the mixture into a solvent, so as to obtain the nano-silicon dioxide liquid; (2) preparing a nano-fiber suspension liquid: dissolving nano-fibers which are processed by virtue of a high-speed shearing machine into a solvent, so as to obtain the nano-fiber suspension liquid; and (3) preparing the nano-silicon dioxide / nano-fiber oil-water separation composite film: uniformly mixing the nano-silicon dioxide liquid with the nano-fiber suspension liquid, so as to obtain a film forming liquid. The preparation method is simple; and the prepared nano-silicon dioxide / nano-fiber oil-water separation composite film has relatively good mechanical strength and relatively high separation efficiency.

Description

technical field [0001] The invention relates to the technical field of membrane engineering, in particular to a nano silicon dioxide / nano fiber oil-water separation composite membrane and a preparation method thereof. Background technique [0002] A large amount of oil pollution is produced in industrial production and daily life. The treatment of oily wastewater has become the primary issue of environmental governance. At present, the treatment of oily wastewater includes oil separation, air flotation and biochemical treatment. In recent years, membrane materials have emerged. The filter-type oil-water separation method is widely used because of its convenient use, thorough separation and many other advantages. [0003] However, the existing methods for preparing oil-water separation membranes are relatively complicated, such as the Chinese invention patent (publication number CN104313796B, date of publication being May 11, 2016), the title of the invention is a method for ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/40B01D71/58B01D71/72B01D69/12B01D67/00B01D17/022B01D69/02
Inventor 王栋李沐芳李玉琴刘柯程盼陈佳慧
Owner WUHAN TEXTILE UNIV
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