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Beta-FeOOH/PDAus/PVDF composite membrane with super hydrophilicity and preparation and application thereof

A super-hydrophilic, composite membrane technology, used in water/sludge/sewage treatment, permeation/dialysis water/sewage treatment, membranes, etc., can solve problems such as membrane fouling, and achieve simple preparation process and good dye removal performance. , good stability and mechanical properties

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

AI Technical Summary

Problems solved by technology

However, the hydrophobic nature of the PVDF membrane itself makes it easy to adsorb organic matter and colloids during the separation process, leading to membrane fouling. It can be seen that the impact of membrane fouling on membrane performance is one of the most severe challenges facing polymer separation membranes.

Method used

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  • Beta-FeOOH/PDAus/PVDF composite membrane with super hydrophilicity and preparation and application thereof
  • Beta-FeOOH/PDAus/PVDF composite membrane with super hydrophilicity and preparation and application thereof
  • Beta-FeOOH/PDAus/PVDF composite membrane with super hydrophilicity and preparation and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0021] A method for preparing a β-FeOOH / PDAus / PVDF composite membrane with superhydrophilic properties, the specific steps are:

[0022] (1) Preparation of dopamine-modified PVDF composite membrane:

[0023] First mix deionized water and absolute ethanol at a volume ratio of 5:1, 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 0.5mg / 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 .

[0024] (2) Preparation of β-FeOOH / PDAus / PVDF composite membrane with superhydrophilic properties:

[0025] FeCl 3 ·6H 2 O was dissolved in 100ml ultrapure water to make a solution with a concentration of 6mg / ml, and then 50ml of 0.01M HCl solution was added to make a miner...

Embodiment 2

[0027] A method for preparing a β-FeOOH / PDAus / PVDF composite membrane with superhydrophilic properties, the specific steps are:

[0028] (1) Preparation of dopamine-modified PVDF composite membrane:

[0029] First mix deionized water and absolute ethanol at a volume ratio of 5:1, 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 1 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 .

[0030] (2) Preparation of β-FeOOH / PDAus / PVDF composite membrane with superhydrophilic properties:

[0031] FeCl 3 ·6H 2 O was dissolved in 100ml ultrapure water to make a solution with a concentration of 12mg / ml, and then 50ml of 0.01M HCl solution was added to make a miner...

Embodiment 3

[0033] A method for preparing a β-FeOOH / PDAus / PVDF composite membrane with superhydrophilic properties, the specific steps are:

[0034] (1) Preparation of dopamine-modified PVDF composite membrane:

[0035] 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 .

[0036] (2) Preparation of β-FeOOH / PDAus / PVDF composite membrane with superhydrophilic properties:

[0037] FeCl 3 ·6H 2 O was dissolved in 100ml ultrapure water to make a solution with a concentration of 18mg / ml, and then 50ml of 0.01M HCl solution was added to make a min...

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Abstract

The invention discloses a beta-FeOOH / PDAus / PVDF composite membrane with super hydrophilicity and a preparation method and application thereof, and belongs to the field of polymer composite membrane modification. The preparation method comprises the following steps of: firstly, carrying out Michael addition reaction on dopamine and PVDF to prepare a PDAus / PVDF composite membrane; then, preparing the composite membrane through the chelation effect between catechol hydroxyl on dopamine molecules and ferric ions, wherein the dopamine microspheres and the beta-FeOOH nanoparticles are fixed on the upper surface and the lower surface of the PVDF membrane and in the membrane pore walls, so that the composite membrane reaches a super-hydrophilic state, and the defects of instability and uncontrollability of hydrophilicity of the PDAus / PVDF composite membrane are overcome. Meanwhile, due to the unique chemical characteristics of beta-FeOOH, the composite membrane obtained after modification hasgood dye removal performance, and therefore the composite membrane has good application value in the fields of water filtration and purification, industrial wastewater dye removal and the like.

Description

technical field [0001] The invention belongs to the field of preparation, modification and application of polymer composite membranes, in particular to a β-FeOOH / PDAus / PVDF composite membrane with excellent hydrophilic properties. Background technique [0002] Polyvinylidene fluoride (PVDF) is a crystalline polymer in white granular or powder form. It has good thermal stability and excellent chemical stability. It is not easily corroded by acids, alkalis, oxidants and halogens at room temperature. Organic solvents such as hydrocarbons, aromatic hydrocarbons, alcohols and aldehydes are very stable, only soluble in a few polar solvents, oleum, strong alkali, etc.; its mechanical properties are outstanding, with good impact strength and toughness, high hardness and wear resistance Good performance; and also has outstanding resistance to gamma rays, ultraviolet radiation and other properties. However, the hydrophobic nature of the PVDF membrane itself makes it easy to adsorb or...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D69/02B01D67/00C02F1/44C02F101/30
CPCB01D67/0079B01D69/02B01D69/12B01D69/125B01D2323/02B01D2325/36C02F1/44C02F2101/308
Inventor 李建华张博鑫余璐萍侍红星
Owner FUZHOU UNIVERSITY