Preparation method and application of a superhydrophilic/underwater superoleophobic polyvinylidene fluoride composite membrane

A polyvinylidene fluoride, underwater super oleophobic technology, applied in the direction of osmosis/dialysis water/sewage treatment, separation methods, chemical instruments and methods, etc., can solve the problem of limited types of oily sewage, poor chemical resistance, separation Low efficiency and other issues, to achieve the effect of low price, easy operation and control, and wide sources

Active Publication Date: 2021-04-20
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are many problems in the application of membrane materials based on special wettability, such as poor swelling resistance of the membrane, poor chemical resistance, rapid flux decay, limited types of oily sewage treatment, and low separation efficiency. waiting to be solved

Method used

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  • Preparation method and application of a superhydrophilic/underwater superoleophobic polyvinylidene fluoride composite membrane
  • Preparation method and application of a superhydrophilic/underwater superoleophobic polyvinylidene fluoride composite membrane
  • Preparation method and application of a superhydrophilic/underwater superoleophobic polyvinylidene fluoride composite membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Preparation of PVDF membrane: Dissolve 3g of polyvinylidene fluoride powder, 1g of polyethylene glycol, and 0.1g of polyvinylpyrrolidone into 30mL of N-methylpyrrolidone, stir mechanically at 50°C for 12h, and make PVDF membrane by phase inversion method.

[0032] (2) Prepare 100mL 2mg / L dopamine hydrochloride solution, sonicate it evenly, add PVDF membrane, seal and shake for 6h, take out the membrane, rinse it with deionized water, and dry it to obtain PVDF@PDA membrane.

[0033] (3) 0.3g nickel nitrate hexahydrate (Ni(NO 3 ) 2 .6H 2 O), 0.6g cobalt nitrate hexahydrate (Co(NO 3 ) 2 .6H 2 O), 0.54g of urea were dissolved in 30mL of deionized water (stirring while ultrasonic), the dissolved mixture was poured into 15mL of ethanol, and PVDF @PDA membrane was added to soak for 30 minutes, and 33mL of the mixture solution was pipetted into the reaction kettle, at 90°C After heating for 6 hours, take it out, rinse it with deionized water and ethanol, and dry it to ...

Embodiment 2

[0035] (1) Preparation of PVDF membrane: Dissolve 4.5g of polyvinylidene fluoride powder, 1.5g of polyethylene glycol, and 0.15g of polyvinylpyrrolidone into 30mL of N-methylpyrrolidone, stir mechanically at 50°C for 12h, and make PVDF by phase inversion method membrane.

[0036] (2) Prepare 100mL 2mg / L dopamine hydrochloride solution, sonicate it evenly, add PVDF membrane, seal and shake for 6h, take out the membrane, rinse it with deionized water, and dry it to obtain PVDF@PDA membrane.

[0037] (3) 0.45g nickel nitrate hexahydrate (Ni(NO 3 ) 2 .6H 2 O), 0.9g cobalt nitrate hexahydrate (Co(NO 3 ) 2 .6H2 O), 0.81g of urea were dissolved in 30mL of deionized water (stirring while ultrasonic), the dissolved mixture was poured into 15mL of ethanol, and PVDF @PDA membrane was added to soak for 30 minutes, and 33mL of the mixture solution was pipetted into the reaction kettle, at 90°C After heating for 3 hours, take it out, rinse it with deionized water and ethanol, and dry i...

Embodiment 3

[0039] (1) Preparation of PVDF membrane: Dissolve 6g of polyvinylidene fluoride powder, 2g of polyethylene glycol (PEG), and 0.2g of polyvinylpyrrolidone into 30mL of N-methylpyrrolidone, stir mechanically at 50°C for 12h, and make it by phase inversion method PVDF membrane.

[0040] (2) Prepare 100mL 2mg / L dopamine hydrochloride solution, sonicate it evenly, add PVDF membrane, seal and shake for 6h, take out the membrane, rinse it with deionized water, and dry it to obtain PVDF@PDA membrane.

[0041] (3) 0.6g nickel nitrate hexahydrate (Ni(NO 3 ) 2 .6H 2 O), 1.2g cobalt nitrate hexahydrate (Co(NO 3 ) 2 .6H 2 O), 1.08g of urea were dissolved in 30mL of deionized water (stirring while ultrasonic), the dissolved mixture was poured into 15mL of ethanol, and PVDF @PDA membrane was added to soak for 30 minutes, and 33mL of the mixture solution was pipetted into the reaction kettle, at 90°C After heating for 9 hours, take it out, rinse it with deionized water and ethanol, and ...

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Abstract

The invention relates to a method for preparing a superhydrophilic / underwater superoleophobic polyvinylidene fluoride composite film, which belongs to the technical field of preparation of environmental functional materials; the specific steps are as follows: firstly, a PVDF film and a PVDF@PDA film are prepared; Dissolve nickel nitrate, cobalt nitrate hexahydrate, and urea in deionized water to obtain a mixed solution. Pour the mixed solution into ethanol, add PVDF@PDA membrane, soak it, and then place it in a reaction kettle for reaction. Use deionized water and ethanol Rinse well, dry to make PVDF@PDA@NiCo 2 (OH) 6 Composite membrane: the invention adopts membrane separation technology, the process is short, the operation is easy to control, resource saving, no secondary pollution, conforms to the concept of green chemistry, and is suitable for widely popularization and use.

Description

technical field [0001] The invention relates to a preparation method of a superhydrophilic / underwater superoleophobic polyvinylidene fluoride composite film, which belongs to the technical field of preparation of environmental functional materials. Background technique [0002] In recent years, large amounts of oily wastewater caused by crude oil exploitation, marine oil spill accidents, and domestic sewage have become a major challenge to the environment. Oily wastewater will cause great harm to the environment. For example, oil floating on the sea surface will quickly spread to form an airtight oil film, which will hinder the reoxygenation of the water body, lead to the lack of oxygen in the ocean water body, affect the growth of marine plankton, and destroy the marine ecology. balance. Oily sewage is also extremely difficult to treat, with low efficiency and high cost. The oil in sewage is divided into four types according to its physical state: free oil, dispersed oil, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D67/00B01D69/02B01D69/12B01D71/34C02F1/40C02F1/44B01D17/022
CPCB01D17/02B01D17/085B01D67/0079B01D69/02B01D69/12B01D71/34B01D2323/02B01D2325/36C02F1/40C02F1/44
Inventor 王倩倩崔久云谢阿田刘思玮闫永胜
Owner JIANGSU UNIV
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