Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Copper hydroxide nanowire/polyvinylidene fluoride hybrid ultrafiltration membrane and preparation method thereof

A technology of polyvinylidene fluoride and copper hydroxide, which is applied in chemical instruments and methods, ultrafiltration, membranes, etc., can solve the problems of limiting the promotion of polyvinylidene fluoride, blocking pores, and reducing membrane water flux, and achieves anti-pollution Effects of performance improvement, hydrophilicity enhancement, and water flux enhancement

Inactive Publication Date: 2017-02-15
NORTHWEST UNIV(CN)
View PDF8 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Due to the strong hydrophobicity of polyvinylidene fluoride ultrafiltration membrane, a large amount of organic matter is easily adsorbed on the membrane surface, blocking the pores, resulting in a decrease in the water flux of the membrane, which largely limits polyvinylidene fluoride as a film-forming polymer. Further promotion of materials in actual production applications

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Copper hydroxide nanowire/polyvinylidene fluoride hybrid ultrafiltration membrane and preparation method thereof
  • Copper hydroxide nanowire/polyvinylidene fluoride hybrid ultrafiltration membrane and preparation method thereof
  • Copper hydroxide nanowire/polyvinylidene fluoride hybrid ultrafiltration membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1) Dissolve 0.998g of analytically pure copper sulfate pentahydrate in 20mL of distilled water under magnetic stirring; stir for 15 minutes until the copper sulfate pentahydrate is completely dissolved, then quickly add 30mL of analytical solution with a concentration of 0.15mol / L under constant stirring. Pure ammonia solution, after 15min a large amount of [Cu(NH 3 ) 4 2+ ]; then 6mL concentration of 1.2mol / L of sodium hydroxide solution was added dropwise in the above solution, along with the addition of sodium hydroxide, the pH value of the solution increased, resulting in [Cu(NH 3 ) 4 2+ ] The stability of the complex is reduced, so the blue copper hydroxide is quickly precipitated. After the drop is completed, it is fully reacted for 1 hour, washed, filtered, and dried at 20-40°C to obtain copper hydroxide nanowires; copper hydroxide nanowires The length of the wire is 600-1000 nm, and the aspect ratio is 120-200.

[0031] 2) Prepare 35g of casting solution: m...

Embodiment 2

[0040] 1) The preparation of copper hydroxide nanowires is exactly the same as in Example 1.

[0041] 2) The difference from Example 1 is that the amount of copper hydroxide nanowires added in the casting solution is different. The specific operation is as follows: Prepare 35g of casting solution: mix 0.035g of copper hydroxide nanowires and 26.915g of N,N-dimethylacetamide, and ultrasonicate at room temperature for 20min to obtain a uniform dispersion of copper hydroxide nanowires;

[0042] Add 7g of polyvinylidene fluoride (dried in vacuum at 110°C for 12h before use), and 1.05g of polyvinylpyrrolidone (molecular weight: 40,000g / mol) into the above copper hydroxide nanowire dispersion in sequence, stir at 60°C for 24h, and then Stand at constant temperature at 60°C for 24 hours to remove air bubbles to obtain a uniform casting solution, and then evenly scrape the casting solution onto a clean and scratch-free glass plate to form a cast layer with a thickness of 130 -250μm; ...

Embodiment 3

[0048] 1) The preparation of copper hydroxide nanowires is exactly the same as in Example 1.

[0049] 2) The difference from Example 1 is that the amount of copper hydroxide nanowires added in the casting solution is different. The specific operation is as follows: prepare 35g of casting solution: mix 0.105g of copper hydroxide nanowires and 26.845g of N,N-dimethylacetamide, and ultrasonicate at room temperature for 20min to obtain a uniform dispersion of copper hydroxide nanowires;

[0050] Add 7g of polyvinylidene fluoride (dried in vacuum at 110°C for 12h before use), 1.05g of polyvinylpyrrolidone (molecular weight: 40000g / mol) into the above-mentioned copper hydroxide nanowire dispersion, stir at 60°C for 24h, and then Stand at constant temperature for 24 hours at ℃ to remove air bubbles to obtain a uniform casting solution, and then evenly scrape the casting solution onto a clean and scratch-free glass plate to form a casting layer. The thickness of the casting layer is 1...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Lengthaaaaaaaaaa
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Login to View More

Abstract

The invention discloses a copper hydroxide nanowire / polyvinylidene fluoride hybrid ultrafiltration membrane and a preparation method thereof. The preparation method comprises the following steps: performing ultrasonic dispersion on a copper hydroxide nanowire in an organic solvent, adding polyvinylidene fluoride and a pore-foaming agent, stirring until the materials are uniformly mixed, standing and defoaming to obtain a membrane casting solution, and performing film scraping on a glass plate; then immersing into a coagulating bath, and preparing by an immerged phase-inversion process to obtain the copper hydroxide nanowire / polyvinylidene fluoride hybrid ultrafiltration membrane. The preparation method disclosed by the invention is simple in flow and convenient to operate; compared with a pure polyvinylidene fluoride ultrafiltration membrane, the prepared copper hydroxide nanowire / polyvinylidene fluoride ultrafiltration membrane has the advantages that the hydrophily is enhanced, and the water flux is also remarkably improved; besides, the antifouling property of the copper hydroxide nanowire / polyvinylidene fluoride hybrid ultrafiltration membrane is also greatly improved, the repeatability of the membrane is enhanced, the difficult problem that the polyvinylidene fluoride ultrafiltration membrane is difficultly popularized and used in a water treatment process due to strong hydrophobicity of the polyvinylidene fluoride ultrafiltration membrane is solved, and further industrial application is realized.

Description

technical field [0001] The invention belongs to the technical field of ultrafiltration membrane separation, and in particular relates to a copper hydroxide nanowire / polyvinylidene fluoride hybrid ultrafiltration membrane and a preparation method thereof. Background technique [0002] Polyvinylidene fluoride has good chemical corrosion resistance, high temperature resistance, oxidation resistance, weather resistance and radiation resistance. It is a separation membrane material with good comprehensive performance, so it is used as an ultrafiltration membrane material. Widely used in various water treatment processes. [0003] However, the C-F bond and C-H bond existing on the surface of the polyvinylidene fluoride material membrane determine its strong hydrophobicity. During the separation process, oily pollutants are easily adsorbed on the membrane surface, causing membrane pollution. The resistance increases, the flux decreases, and the separation performance decreases. Fr...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): B01D71/34B01D69/02B01D67/00B01D61/14
CPCB01D71/34B01D61/145B01D67/0079B01D67/0093B01D69/02B01D2325/36
Inventor 韩小龙王叶胡婷婷
Owner NORTHWEST UNIV(CN)
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com