Layered double hydroxide composite nano-filtration membrane and preparation method thereof

A layered bimetallic and composite nanofiltration membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problem of poor bonding between the surface layer and the base membrane, which affects the performance, uniformity and stability of the composite membrane Insufficient water resistance and other problems, to achieve good hydrophilicity, easy operation, and good stability

Active Publication Date: 2018-01-16
XIAMEN UNIV OF TECH
View PDF2 Cites 19 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the binding force between the surface layer of LDHs and the base film is often poor, and the uniformity and stability are not enough, which seriously affects the performance of the composite film.

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
  • Layered double hydroxide composite nano-filtration membrane and preparation method thereof
  • Layered double hydroxide composite nano-filtration membrane and preparation method thereof
  • Layered double hydroxide composite nano-filtration membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0016] The present invention proposes a kind of preparation method of layered double metal hydroxide composite nanofiltration membrane, comprises the following steps:

[0017] S1, immersing the basement membrane in an alkaline aqueous solution containing dopamine monomer for reaction, forming a layer of polydopamine functional modification layer on the basement membrane;

[0018] S2, putting the polydopamine-modified basement membrane into a reactor containing a metal salt precursor and a precipitating agent, and heating to form a layered double metal hydroxide functional surface layer on the basement membrane in situ to obtain a composite nanofiltration membrane.

[0019] Further, in a preferred embodiment of the present invention, the base membrane is selected from one of polysulfone porous membranes, polyethersulfone porous membranes, polyacrylonitrile porous membranes, polyvinylidene fluoride membranes, and polyamide composite membranes. Since the functional modification o...

Embodiment 1

[0028] First, the polyamide-based membrane is directly immersed in an alkaline aqueous solution containing 2g / L dopamine monomer at pH=8.5 for 10 hours to form a layer of polydopamine functional modification layer on the base membrane; In the reactor of aluminum chloride, 135mmol / L magnesium chloride precursor and 15g / L urea precipitant, the hydrothermal reaction was carried out at 120°C for 18h, and finally a layered double metal hydroxide functional surface layer was formed in situ on the polydopamine-modified basement membrane , to obtain a composite nanofiltration membrane. After rinsing several times with deionized water, the prepared composite membrane was kept in water.

Embodiment 2

[0030] Example 2 is basically the same as Example 1, except that the temperature of the hydrothermal reaction is 110° C. and the time is 18 hours.

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
concentrationaaaaaaaaaa
concentrationaaaaaaaaaa
Login to view more

Abstract

The invention provides a layered double hydroxide composite nano-filtration membrane and a preparation method thereof, and relates to the technical field of membranes. The composite nano-filtration membrane is obtained by modifying to generate a polydopamine functional layer on a base membrane firstly, and then constructing a double hydroxide functional cortex on the surface of a polydopamine-modified membrane in situ. Functional groups of a polydopamine-modified layer can improve the hydrophilcity, the permeability, the selectivity and the anti-pollution performance of the membrane, and can interact with a metal salt precursor, so as to promote the deposition and in-situ growth of the precursor on the surface of the membrane; the double hydroxide layer which is generated in an auxiliary manner is distributed uniformly, has stronger acting force with the base membrane, and is beneficial to the stability of the performance of the membrane. The construction of the double hydroxide functional cortex can be regulated and controlled effectively, which is beneficial to improving the water flux, the hydrophilcity and the chlorine resistance of the membrane. The overall preparation processhas the advantages of mild conditions and convenient operation; the composite nano-filtration membrane with excellent comprehensive performance is obtained, and has the prospect of industrial production and commercial application.

Description

technical field [0001] The invention relates to the field of membrane technology, and in particular to a layered double metal hydroxide composite nanofiltration membrane and a preparation method thereof. Background technique [0002] The preparation and performance optimization of high-performance nanofiltration membranes are the core of nanofiltration membrane separation technology. The composite method is currently the most widely used and most effective method for preparing nanofiltration membranes. In this method, a layer of ultra-thin surface layer with nano-scale pore diameter is generally compounded on a porous support base film. Since the surface layer and the support layer can be made of different materials, the appropriate surface layer and support layer can be selected respectively to optimize performance in terms of selectivity, permeability, chemical and thermal stability. At present, a variety of nanofiltration membranes with polyamide, polyimide, polyester, ...

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
Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D71/56B01D69/12B01D69/02B01D67/00B01D61/02
Inventor 吴慧青毛龙谢天顺刘跃军
Owner XIAMEN UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap