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Preparation of super-hydrophilic SiO2/PDAus/PVDF composite membrane

A super-hydrophilic, composite membrane technology, applied in water/sludge/sewage treatment, water/sewage treatment, osmotic/dialysis water/sewage treatment, etc. Extensive practicability It is difficult to prepare, and the membrane pore structure is difficult to control. It can solve the problems of unevenness and embedding, good anti-pollution performance, and easy operation.

Inactive Publication Date: 2020-09-25
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the strong hydrophobicity of the PVDF membrane itself, it is easy to absorb proteins, oil droplets, colloids or other organic substances in the water during water treatment, resulting in membrane pore blockage, permeation flux, selectivity and use efficiency. And when used as bioseparation and blood contact materials, it is easy to form coagulation and cause complications, which limits its application in water treatment and biomedicine.
[0004] Compared with organic membranes, inorganic membranes have better chemical stability, thermal stability, mechanical strength, hydrophilicity, and anti-pollution properties, but their wide practicability is limited by the difficulty of preparation, difficulty in controlling the membrane pore structure, and structural brittleness. and the disadvantages of high production costs are limited by

Method used

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  • Preparation of super-hydrophilic SiO2/PDAus/PVDF composite membrane
  • Preparation of super-hydrophilic SiO2/PDAus/PVDF composite membrane
  • Preparation of super-hydrophilic SiO2/PDAus/PVDF composite membrane

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Embodiment 1

[0022] A SiO with superhydrophilic properties 2 / PDAus / PVDF composite membrane preparation method, the specific steps are:

[0023] (1) Preparation of dopamine-modified PDAus / PVDF composite membrane:

[0024] First mix deionized water and absolute ethanol at a volume ratio of 1:1, add Tris-phosphate neutral buffer to make a solution with a Tris concentration of 10 mmol / L, then dissolve dopamine powder into the solution, and stir 1 day, make a dopamine solution with a concentration of 0.5 mg / ml, then add the original PVDF membrane into the obtained dopamine solution, continue to stir for 3 days, and finally wash the membrane and let the membrane dry for 2 days to obtain the modified PDAus / PVDF composite membrane.

[0025] (2) SiO with superhydrophilic properties 2 / PDAus / PVDF composite membrane preparation:

[0026] Weigh 0.2g of lysine and dissolve it in 100ml of ultrapure water, then add 3ml of tetraethyl orthosilicate (TEOS), and then add 0.01mol / L of HNO 3 Solution, so...

Embodiment 2

[0028] A SiO with superhydrophilic properties 2 / PDAus / PVDF composite membrane preparation method, the specific steps are:

[0029] (1) Preparation of dopamine-modified PDAus / PVDF composite membrane:

[0030] First mix deionized water and absolute ethanol at a volume ratio of 5:2, add Tris-phosphate neutral buffer to make a solution with a Tris concentration of 10 mmol / L, then dissolve dopamine powder into the solution, and stir 1 day, make a dopamine solution with a concentration of 1.0mg / ml, then add the original PVDF membrane into the dopamine solution, continue to stir for 3 days, and finally wash the membrane and let the membrane dry for 2 days to obtain the modified PDAus / PVDF composite membrane.

[0031] (2) SiO with superhydrophilic properties 2 / PDAus / PVDF composite membrane preparation:

[0032] Weigh 0.3g of lysine and dissolve it in 100ml of ultrapure water, then add 5ml of tetraethyl orthosilicate (TEOS), and then add 0.01mol / L of HNO 3 solution, so that the ...

Embodiment 3

[0034] A SiO with superhydrophilic properties 2 / PDAus / PVDF composite membrane preparation method, the specific steps are:

[0035] (1) Preparation of dopamine-modified PDAus / PVDF composite membrane:

[0036] First mix deionized water and absolute ethanol at a volume ratio of 5:2, add Tris-phosphate neutral buffer to make a solution with a Tris concentration of 10 mmol / L, then dissolve dopamine powder into the solution, and stir 1 day, make a dopamine solution with a concentration of 1.5 mg / ml, then add the original PVDF membrane into the dopamine solution, continue to stir for 3 days, and finally wash the membrane and let the membrane dry for 2 days to obtain the modified PDAus / PVDF composite membrane.

[0037] (2) SiO with superhydrophilic properties 2 / PDAus / PVDF composite membrane preparation:

[0038] Weigh 0.4g of lysine and dissolve it in 100ml of ultrapure water, then add 7ml of tetraethyl orthosilicate (TEOS), and then add 0.01mol / L of H 2 SO 4 Solution, so that ...

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Abstract

The invention discloses a super-hydrophilic SiO2 / PDAus / PVDF composite membrane and a preparation method thereof, and belongs to the field of polymer composite membrane modification. The preparation method comprises the following steps of: preparing silicon dioxide nanoparticles from a precursor solution prepared from tetraethyl orthosilicate, and immobilizing the silicon dioxide nanoparticles on the surface of a dopamine-modified PVDF membrane and in membrane pores in all directions to change the structure and properties of the composite membrane, thereby obtaining the super-hydrophilic SiO2 / PDAus / PVDF composite membrane. Compared with a PVDF original membrane and a PDAus / PVDF composite membrane, the SiO2 / PDAus / PVDF composite membrane has a larger specific surface area; membrane pores andthe surface of the membrane are comprehensively modified, and the exposed part is completely covered with hydrophilic groups, so that the good hydrophilic effect of the composite membrane can be exerted to the maximum extent, and the SiO2 / PDAus / PVDF composite membrane has a wide application value in the field of water filtration and purification.

Description

technical field [0001] The invention belongs to the field of preparation, modification and application of polymer composite membranes, in particular to a SiO with superhydrophilic properties 2 / PDAus / PVDF composite membrane. Background technique [0002] Common membrane separation microfiltration and ultrafiltration can intercept most suspended solids, colloids and bacteria in water, and can replace traditional water treatment processes. Urban sewage is recognized as one of the renewable water sources. The urban sewage treated by microfiltration to ultrafiltration technology can further reduce the turbidity, color and organic matter of the water, and the effluent can be used as a circulating cooling water source. When the water treatment technology is used for the treatment of oily wastewater, the oil and water can be separated directly without demulsification. [0003] Most of the polymer membranes on the market are hydrophobic membranes, such as polyvinylidene fluoride (...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D67/00B01D69/02C02F1/44
CPCB01D67/0079B01D69/02B01D69/12B01D2323/02B01D2325/36C02F1/44C02F1/444
Inventor 李建华张博鑫余璐萍侍红星
Owner FUZHOU UNIV
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