High-stability and high-flux polydopamine nanoparticle modified membrane as well as preparation method and application thereof

A polydopamine nanometer and high-stability technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of easy peeling off, unstable coating, lack of strong interaction between coating and membrane surface, etc. problem, to achieve high stability

Active Publication Date: 2022-04-08
GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the surface coating method has the problem of lack of strong interaction between the coating and the film surface, which leads to the instability of the coating and easy peeling off, which makes the long-term stability of the film poor, thus limiting its application.

Method used

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  • High-stability and high-flux polydopamine nanoparticle modified membrane as well as preparation method and application thereof
  • High-stability and high-flux polydopamine nanoparticle modified membrane as well as preparation method and application thereof
  • High-stability and high-flux polydopamine nanoparticle modified membrane as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Preparation of polydopamine / polyethyleneimine nanoparticles (PDA / PEI-NPs) film, the steps are as follows:

[0052] Step 1, the synthesis of PDA / PEI nanoparticles:

[0053] Dissolve 0.506g dopamine hydrochloride in 300mL aqueous solution, add 1.7mL, 1mol / L NaOH solution and shake at 50°C for 8h, then add 0.253g polyethyleneimine to the above solution and shake at 35°C for 2h. After the reaction is completed, use high-speed centrifugation (6000rpm, 20min) and multiple deionized water washes. After the washing is completed, the nanoparticles are ultrasonically dispersed in deionized water to obtain a PDA / PEI nanoparticle dispersion.

[0054] Step 2, co-deposition modification of PVDF membrane:

[0055] Cut a circular PVDF membrane with a diameter of 17 cm and put it into a Buchner funnel, add 50 mL of ethanol to fully wet it and filter it with suction, then add 200 mL of deionized water to continue the suction filtration (the vacuum pressure during the suction filtration ...

Embodiment 2

[0059] Preparation of low-loaded polydopamine / polyethyleneimine nanoparticles (PDA / PEI-NPs) film, the difference between the preparation process and Example 1 is only: in step 3, the concentration of the nanoparticle dispersion is 60 μg / L, PEI The mass of 0.6mg.

Embodiment 3

[0061] Preparation of high-loaded polydopamine / polyethyleneimine nanoparticles (PDA / PEI-NPs) film, the only difference between the preparation process and Example 1 is: in step 3, the concentration of the nanoparticle dispersion is 300 μg / L, PEI The mass of 3.0mg.

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Abstract

The invention discloses a high-stability and high-flux polydopamine nanoparticle modified membrane as well as a preparation method and application thereof. The preparation method comprises the following steps: carrying out vacuum filtration on a mixed solution of polydopamine/polyethyleneimine nanoparticles and polyethyleneimine macromolecules, loading the nanoparticles in a polydopamine/polyethyleneimine co-deposited film, and further reacting to prepare the polydopamine/polyethyleneimine co-deposited film. In the vacuum filtration process, the nano-particles with covalent bonds formed inside are selectively adhered to dead corner areas in membrane holes, so that fluid in the nano-particles in the membrane is prevented from being washed away, and macromolecules on the surfaces of the nano-particles are prevented from being eroded by the fluid. In addition, the nano-particles cannot block through pore channels in the membrane, and the hydrophilicity of the membrane is enhanced after the particles are loaded, so that the membrane flux is further increased, and the membrane has better anti-pollution performance.

Description

technical field [0001] The invention relates to the technical field of water treatment membrane preparation, in particular to a polydopamine nanoparticle modified membrane with high stability and high flux, a preparation method and application thereof. Background technique [0002] The shortage of water resources and the deterioration of water quality are common challenges faced by mankind in the 21st century. As one of the most competitive water treatment technologies in the future, membrane separation has the advantages of low energy consumption and wide application. In order to highlight these advantages, it is the goal pursued by researchers to design a water treatment separation membrane with simple preparation process, stable performance and high efficiency. The relatively simple preparation method of separation membranes for water treatment is the modification method, that is, loading functional areas on the surface or inside of the original separation membranes. Am...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/02B01D71/60C02F1/44
CPCY02A20/131
Inventor 马宇贺斌
Owner GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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