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A polyamide nanofiltration membrane containing sulfobetaine-type colloidal nanoparticles and preparation method thereof

A sulfobetaine and nanoparticle technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of membrane defects, insignificant modification effect, and easy membrane aggregation, and achieve excellent membrane performance. , good industrial practicability, the effect of improving transmission efficiency

Active Publication Date: 2015-08-05
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, according to the existing reports, these modified materials still have problems such as ineffective modification, easy aggregation in the membrane, and defects in the membrane.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0016] The polyamide nanofiltration membrane preparation method containing sulfobetaine type colloidal nanoparticles comprises the following steps:

[0017] (1) Using sulfobetaine group-containing olefin monomers and hydroxyalkyl acrylate monomers as functional monomers, prepare an aqueous solution, add a water-soluble oxidation-reduction initiator, and use soap-free emulsion polymerization to prepare sulfonate Acid betaine type colloidal nanoparticles;

[0018] (2) Uniformly disperse polyamine monomers and sulfobetaine-type colloidal nanoparticles in water, add sodium hydroxide as an acid absorbent, and prepare an aqueous phase solution; dissolve polyacyl chloride monomers in an organic solvent, and prepare organic phase solution;

[0019] (3) Immerse the porous polysulfone support membrane in the aqueous phase solution for 2 to 5 minutes, take out and remove the excess aqueous phase solution on the surface; then immerse in the organic phase solution for 0.5 to 3 minutes, ta...

Embodiment 1

[0029] Take 10g of 3-[N,N-dimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]ammonium]propane-1-sulfonic acid inner salt and 2g of hydroxyethyl acrylate and add In 100ml of water, nitrogen gas was introduced, and potassium persulfate and sodium bisulfite (mass ratio 1:1) with a concentration of 1 wt% were added, at 30 o Soap-free emulsion polymerization was carried out at C for 5 hours, after several times of centrifugation, water washing, and vacuum drying, the sulfobetaine-type colloidal nanoparticles were obtained; the porous polysulfone support membrane was immersed in the aqueous phase solution for 2 minutes, and the aqueous phase solution was The concentration of piperazine is 0.2 wt%, the concentration of sulfobetaine-type colloidal nanoparticles is 0.05 wt%, and the concentration of NaOH is 0.01 wt%, take out and remove the excess aqueous phase solution on the surface; then immerse to a concentration of 0.1 wt% In the n-hexane solution of trimesoyl chloride, the interfacial po...

Embodiment 2

[0032] Take 30g of 3-[N,N-dimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]ammonium]propane-1-sulfonic acid inner salt and 10g of hydroxyethyl acrylate and add In 100ml of water, nitrogen gas was introduced, and potassium persulfate and sodium bisulfite (mass ratio 1:1) were added with a concentration of 3 wt%, at 45 o Soap-free emulsion polymerization was carried out at C for 1 hour, after repeated centrifugation, water washing, and vacuum drying, sulfobetaine-type colloidal nanoparticles were obtained; the porous polysulfone support membrane was immersed in the aqueous phase solution for 5 minutes, and in the aqueous phase solution The concentration of piperazine is 2 wt%, the concentration of sulfobetaine type colloidal nanoparticles is 0.5 wt%, the concentration of NaOH is 0.5 wt%, take out and remove the excess aqueous phase solution on the surface; In the n-hexane solution of trimesoyl chloride, the interfacial polymerization reaction was carried out for 3 minutes at 70 o C f...

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Abstract

The invention discloses a preparation method of a polyamide nanofiltration membrane containing sulfoacid betaine type colloid nanometer particles, and the preparation method comprises the following steps of: preparing colloid nanometer particles by adopting a soap-free emulsion polymerization method; adding to a water phase monomer solution used for synthesizing a polyamide membrane; preparing the polyamide nanofiltration membrane containing the sulfoacid betaine type colloid nanometer particles through an interfacial polymerization method. The polyamide nanofiltration membrane disclosed by the invention keeps high selectivity of the polyamide membrane on inorganic salt and greatly increases the water permeation flux of the polyamide membrane by utilizing the unique nanometer pore structure and good hydrophilicity of the sulfoacid betaine type colloid nanometer particles. Besides, the sulfoacid betaine type colloid nanometer particles have higher pollution resistance and show good stability pollution resistance in the long-term operating process of a filter membrane, thus the prepared polyamide nanofiltration membrane containing the sulfoacid betaine type colloid nanometer particles has high selectivity, permeability and pollution resistance. The preparation method of the polyamide nanofiltration membrane is simple, easy to operate and low in cost and achieves a good industrialized application prospect.

Description

technical field [0001] The invention belongs to the field of nanofiltration membrane separation, in particular to a polyamide nanofiltration membrane containing sulfobetaine-type colloidal nanoparticles and a preparation method thereof. Background technique [0002] As a new separation technology, nanofiltration has the advantages of low energy consumption, high separation efficiency, and environmental protection compared with traditional separation technologies such as distillation and rectification. Nanofiltration membrane is a new type of pressure-driven separation membrane with a pore size between ultrafiltration membrane and reverse osmosis membrane. According to the separation principle of pore size screening and electrostatic repulsion, the rejection rate of nanofiltration membranes for divalent or polyvalent inorganic salts and organic molecules with a molecular weight greater than 200 is generally higher than 90%, while for monovalent inorganic salts and low molecul...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/82B01D71/56B01D69/02B01D69/10B01D67/00
Inventor 计艳丽安全福高从堦
Owner ZHEJIANG UNIV
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