A kind of layered double metal hydroxide composite nanofiltration 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. Membrane performance and other issues, to achieve good hydrophilicity, nanofiltration selectivity improvement, and easy operation

Active Publication Date: 2020-02-11
XIAMEN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

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  • A kind of layered double metal hydroxide composite nanofiltration membrane and preparation method thereof
  • A kind of layered double metal hydroxide composite nanofiltration membrane and preparation method thereof
  • A kind of layered double metal hydroxide composite nanofiltration membrane and preparation method thereof

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preparation example Construction

[0016] The present invention provides a method for preparing a layered double metal hydroxide composite nanofiltration membrane, which includes the following steps:

[0017] S1, immersing the base film in an alkaline aqueous solution containing dopamine monomers for reaction to form a polydopamine functional modification layer on the base film;

[0018] S2: Put the polydopamine-modified base membrane into a reactor containing a metal salt precursor and a precipitating agent, and heat it to generate a layered bimetallic hydroxide functional surface layer in situ on the base membrane 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 of polydopamine can make it suitable for a va...

Embodiment 1

[0028] Firstly, the polyamide base film is directly immersed in an alkaline aqueous solution containing 2g / L dopamine monomer at pH=8.5 and reacted for 10 hours to form a polydopamine functional modification layer on the base film; after rinsing, put it in containing 45mmol / L chlorine In a reactor containing aluminum, 135mmol / L magnesium chloride precursor and 15g / L urea precipitant, hydrothermally reacted at 120℃ for 18h, and finally a layered bimetallic hydroxide functional surface layer is formed in situ on the polydopamine modified base film , Get the composite nanofiltration membrane. After rinsing with deionized water for several times, the prepared composite membrane is stored 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.

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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 technical field of membranes, 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. The method is generally to compound an ultra-thin surface layer with nanometer-scale pore size on a porous supporting base membrane. Since the surface layer and the support layer can be made of different materials, the appropriate surface layer and the support layer can be selected to optimize the performance in terms of selectivity, permeability, chemical and thermal stability. At present, many kinds of nanofiltration membranes with polyamide, polyimide, polyester, etc. as the s...

Claims

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Application Information

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Patent Type & Authority Patents(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
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