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Preparation method and application of PVDF (polyvinylidene fluoride)@PDA@ZnO composite membrane

A technology of composite membrane and membrane casting solution, which is applied in the direction of separation methods, chemical instruments and methods, membranes, etc., can solve the problems of water-removing membranes that are prone to pollution, etc., and achieve good UV self-cleaning properties, no secondary pollution, and structural stable effect

Inactive Publication Date: 2020-01-24
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In practical applications, water removal membranes are also prone to pollution when used for long-term oil-water separation

Method used

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  • Preparation method and application of PVDF (polyvinylidene fluoride)@PDA@ZnO composite membrane
  • Preparation method and application of PVDF (polyvinylidene fluoride)@PDA@ZnO composite membrane
  • Preparation method and application of PVDF (polyvinylidene fluoride)@PDA@ZnO composite membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Add 3g of polyvinylidene fluoride powder, 1g of polyethylene glycol, and 0.1g of polyvinylpyrrolidone into 30mL of N-methylpyrrolidone, mechanically stir at 50°C for 12 hours to obtain a casting solution, and pour the casting solution on the glass Scrape the plate evenly with a glass rod, slowly put it into deionized water, and make PVDF membrane by phase inversion method;

[0034] (2) Prepare 100 mL of 2 mg / L dopamine hydrochloride solution, add PVDF membrane, seal and shake for 6 hours, rinse with deionized water, and dry to prepare PVDF@PDA membrane;

[0035] (3) Weigh 1.284g of anhydrous zinc acetate and 0.4g of sodium hydroxide to prepare a zinc acetate ethanol solution with a concentration of 70mmoL / L and a sodium hydroxide ethanol solution with a concentration of 0.1moL / L; weigh 1.19g of zinc nitrate and Dissolve 0.561g of cyclohexamethylenetetramine in 50mL of deionized water to make a mixed solution; put the PVDF@PDA membrane in the prepared zinc acetate et...

Embodiment 2

[0037] (1) Weigh 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 12 hours to obtain a casting solution, and pour the casting solution into Scrape the glass plate evenly with a glass rod, slowly put it into deionized water, and make PVDF membrane by phase inversion method;

[0038] (2) Prepare 100 mL of 2 mg / L dopamine hydrochloride solution, add PVDF membrane, seal and shake for 6 hours, rinse with deionized water, and dry to prepare PVDF@PDA membrane;

[0039](3) Weigh 1.284g of anhydrous zinc acetate and 0.4g of sodium hydroxide to prepare a zinc acetate ethanol solution with a concentration of 70mmoL / L and a sodium hydroxide ethanol solution with a concentration of 0.1moL / L; weigh 1.19g of zinc nitrate and Dissolve 0.561g of cyclohexamethylenetetramine in 50mL of deionized water to make a mixed solution; put the PVDF@PDA membrane in the prepared zinc acetate eth...

Embodiment 3

[0048] (1) Weigh 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 12 hours to obtain a casting solution, and pour the casting solution into Scrape the glass plate evenly with a glass rod, slowly put it into deionized water, and make PVDF membrane by phase inversion method;

[0049] (2) Prepare 100 mL of 2 mg / L dopamine hydrochloride solution, add PVDF membrane, seal and shake for 6 hours, rinse with deionized water, and dry to prepare PVDF@PDA membrane;

[0050] (3) Weigh 1.284g of anhydrous zinc acetate and 0.4g of sodium hydroxide to prepare a zinc acetate ethanol solution with a concentration of 70mmoL / L and a sodium hydroxide ethanol solution with a concentration of 0.1moL / L; weigh 1.19g of zinc nitrate and Dissolve 0.561g of cyclohexamethylenetetramine in 50mL of deionized water to make a mixed solution; put the PVDF@PDA membrane in the prepared zinc acetate et...

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Abstract

The invention relates to the technical field of preparation of environmental functional materials and in particular relates to a preparation method and application of a PVDF (polyvinylidene fluoride)@PDA@ZnO composite membrane. The membrane has a self-cleaning super-hydrophilic / underwater super-lipophobic property under ultraviolet driving. A photocatalyst zinc oxide is riveted onto a PVDF membrane by using a dopamine bionic adhesion technology and a hydrothermal method, then the defect that inorganic nanoparticles loaded on a PVDF membrane by using a conventional single dopamine adhesion technology are easy to drop off can be overcome, and the PVDF@PDA@ZnO composite membrane can be prepared. The membrane is simple to prepare, and has potential application such as separation of oil stainsfrom oily wastewater and water purification. Besides, the preparation process is short, the operation is easy to control, resources are saved, no secondary pollution is caused, and the preparation method meets green chemical principles and is applicable to wide popularization and application.

Description

technical field [0001] The invention relates to the technical field of preparation of environmental functional materials, in particular to a preparation method and application of a PVDF@PDA@ZnO composite membrane. Background technique [0002] With the acceleration of industrialization and civilization, environmental issues have become a global challenge to sustainable development. Among them, oil spills during production and transportation, as well as the discharge of oily wastewater from industrial production and domestic sewage, will cause serious pollution to water bodies. Efficient separation of oil from oily water is essential for water conservation and oil collection / recovery. In order to reduce the harm of oily wastewater to the environment, various oil-water separation methods have been proposed, such as oil-absorbing materials, air flotation, flocculation, etc. However, most of these conventional processes are hindered by problems such as high energy consumption,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/38B01D71/34B01D71/02B01D69/12B01D67/00B01D17/022
CPCB01D17/02B01D67/0079B01D69/12B01D71/024B01D71/34B01D71/38B01D2325/36
Inventor 王倩倩崔久云谢阿田闫永胜
Owner JIANGSU UNIV
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