Composite nanofiltration membrane taking layered double hydroxides as modified templates and preparation method

A layered bimetallic and composite nanofiltration membrane technology, which is applied in the field of separation membranes, can solve the problems of reducing mechanical strength and the difficulty of modifying the modified support base membrane, so as to improve the separation performance, enhance the surface wrinkle rough structure, and reduce the transmission rate. The effect of mass resistance

Active Publication Date: 2020-09-22
XIAMEN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the modification of the modified support base film is often difficult or even reduces the mechanical strength.

Method used

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  • Composite nanofiltration membrane taking layered double hydroxides as modified templates and preparation method
  • Composite nanofiltration membrane taking layered double hydroxides as modified templates and preparation method
  • Composite nanofiltration membrane taking layered double hydroxides as modified templates and preparation method

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preparation example Construction

[0020] This embodiment also proposes the preparation method of the composite nanofiltration membrane with the above-mentioned layered double metal hydroxide as a modified template, including the following steps:

[0021] S1, obtaining a layered double metal hydroxide, and modifying the surface of the layered double metal hydroxide with a modifier containing polyphenol molecules to obtain a modified layered double metal hydroxide.

[0022] In a preferred embodiment, the layered double metal hydroxide is obtained according to the following steps: disperse divalent metal salt, trivalent metal salt and precipitant in water, react at 120-180°C for 5-36 hours to obtain a layer double metal hydroxide.

[0023] Further preferably, the metal ion in the divalent metal salt is selected from one or more of magnesium ion, zinc ion, nickel ion, calcium ion, cobalt ion and manganese ion, and the divalent metal salt is selected from chloride salt, sulfate and one or more of nitrates; the con...

Embodiment 1

[0040] A kind of composite nanofiltration membrane provided by the present embodiment is prepared according to the following steps:

[0041] (1) Weigh 4.69mmol of magnesium chloride, 1.56mmol of aluminum chloride and 8.44mmol of urea, dissolve them in 32mL of deionized water, transfer them to an autoclave after ultrasonication, and react at 160°C for 6h. Centrifuge and wash to obtain layered double hydroxides (LDHs) powder. Disperse 0.03g LDHs powder evenly in 100mL deionized water, add 0.02g dopamine hydrochloride and 0.12g Tris, stir and react for 5h, centrifuge and wash to obtain modified LDHs powder.

[0042] (2) Disperse the modified LDHs powder in water, ultrasonically treat it for 5 min, then filter the uniformly dispersed aqueous solution of modified LDHs onto the polysulfone porous membrane to obtain a modified polysulfone porous membrane, and control the loading capacity of the modified LDHs as 0.4g / m 2 .

[0043] (3) The modified polysulfone porous membrane obtai...

Embodiment 2

[0047] The difference between the composite nanofiltration membrane provided in this example and Example 1 is that the load of modified LDHs is 0.2g / m 2 .

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Abstract

The invention provides a composite nanofiltration membrane taking layered double hydroxides as modified templates and a preparation method, and relates to the technical field of separation membranes.The preparation method comprises the following steps: firstly, loading layered double hydroxides modified by polyphenol molecules on a support base membrane to form a modified support base membrane; and then carrying out interfacial polymerization reaction on the modified support base membrane. In the interfacial polymerization process, the loaded modified layered double hydroxides are favorable for forming an active separation layer with ultra-thin thickness and large effective area. Then, the modified layered double hydroxides are removed through acid solution etching, a large number of nanopores are formed in the connecting interface of the supporting base membrane and the active separation membrane, and the obtained composite nanofiltration membrane is excellent in separation performance and stable in structure and has industrial production and commercial application prospects.

Description

technical field [0001] The invention relates to the field of separation membranes, and in particular to a composite nanofiltration membrane with a layered double metal hydroxide as a modified template and a preparation method. Background technique [0002] At present, 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 generally uses amine monomers and acid chloride monomers to react on a porous modified support base membrane to form a layer of active separation surface layer with nanometer pore size. The surface properties and porous structure of the porous support layer determine the adsorption / diffusion of amine monomers during interfacial polymerization and the subsequent reaction with acid chlorides, which are closely related to the separat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/02B01D69/10B01D69/12B01D61/00
CPCB01D67/003B01D67/0006B01D69/02B01D69/125B01D69/105B01D61/027B01D2323/24
Inventor 吴慧青毛龙刘跃军
Owner XIAMEN UNIV OF TECH
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