Preparation method of polyamide composite nanofiltration membrane for removing heavy metal pollutants

A composite nanofiltration membrane and pollutant technology, which is applied in the direction of water pollutants, chemical instruments and methods, membrane technology, etc., can solve problems such as obvious agglomeration, and achieve the effect of improving dispersion and permeability

Active Publication Date: 2020-04-28
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the concentration increases, the agglomeration phenomenon is still obvious

Method used

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  • Preparation method of polyamide composite nanofiltration membrane for removing heavy metal pollutants
  • Preparation method of polyamide composite nanofiltration membrane for removing heavy metal pollutants
  • Preparation method of polyamide composite nanofiltration membrane for removing heavy metal pollutants

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Ⅰ The preparation process of modified silica nanoparticles containing halogen groups on the surface is as follows:

[0053] 10g SiO 2 (with a particle size of 7-40nm) was added to 250ml of N,N-dimethylformamide, and stirred to obtain a nanoparticle dispersion; while stirring, 6ml of 3-chloropropyltriethoxysilane was added, and kept stirring, at 80°C After reacting for 12 hours under the same conditions, take the reaction product and centrifuge it, wash it with absolute ethanol and centrifuge again, repeat the operation three times, dry it in vacuum for 48 hours, and grind the obtained solid substance with a mortar for 5 minutes to obtain SiO 2 -Cl;

[0054] II The preparation process of the modified silica nanoparticles (silica-polyionic liquid particles) containing polyionic liquid on the surface is as follows:

[0055] Take 0.10 g of copper bromide, 0.10 g of 2,2'-bipyridine, 20 g of 1-allyl-3-methylimidazolium hexafluorophosphate and 5.0 g of SiO 2 -Cl was dispers...

Embodiment 2

[0060] Ⅰ The preparation process of modified silica nanoparticles containing halogen groups on the surface is as follows:

[0061] 10g SiO 2 (with a particle size of 7-40nm) was added to 250ml of N,N-dimethylformamide, and stirred to obtain a nanoparticle dispersion; while stirring, 6ml of 3-chloropropyltriethoxysilane was added, and kept stirring, at 80°C After reacting for 12 hours under the same conditions, take the reaction product and centrifuge it, wash it with absolute ethanol and centrifuge again, repeat the operation three times, dry it in vacuum for 48 hours, and grind the obtained solid substance with a mortar for 5 minutes to obtain SiO 2 -Cl;

[0062] II The preparation process of the modified silica nanoparticles (silica-polyionic liquid particles) containing polyionic liquid on the surface is as follows:

[0063] Take 0.10g of copper bromide, 0.10g of 2,2'-bipyridine, 20g of 1-allyl-3-methylimidazolium bromide and 5.0g of SiO 2 -Cl was dispersed in 200ml of N...

Embodiment 3

[0068] Ⅰ The preparation process of modified silica nanoparticles containing halogen groups on the surface is as follows:

[0069] 10g SiO 2 (with a particle size of 7-40nm) was added to 250ml of N,N-dimethylformamide, and stirred to obtain a nanoparticle dispersion; while stirring, 6ml of 3-chloropropyltriethoxysilane was added, and kept stirring, at 80°C After reacting for 12 hours under the same conditions, take the reaction product and centrifuge it, wash it with absolute ethanol and centrifuge again, repeat the operation three times, dry it in vacuum for 48 hours, and grind the obtained solid substance with a mortar for 5 minutes to obtain SiO 2 -Cl;

[0070] II The preparation process of the modified silica nanoparticles (silica-polyionic liquid particles) containing polyionic liquid on the surface is as follows:

[0071] Take 0.10 g of copper bromide, 0.10 g of 2,2'-bipyridine, 10 g of 1-allyl-3-methylimidazolium tetrafluoroborate and 5.0 g of SiO 2 -Cl was dispersed...

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Abstract

The invention relates to a preparation method of a polyamide composite nanofiltration membrane. The method comprises the following steps: dispersing silicon dioxide nanoparticles in N, N-dimethylformamide to prepare a substance I; grinding the substance I to obtain modified silicon dioxide nanoparticles; dispersing an ionic liquid, 2, 2'-dipyridyl, copper bromide and the modified nanoparticles into N, N-dimethylformamide, and adding an azodiisobutyronitrile solution for reaction to obtain a substance II; grinding the substance II to obtain silicon dioxide-polyion liquid particles; mixing triethylamine and piperazine hexahydrate into water, adding the silicon dioxide-polyion liquid particles, and performing ultrasonic dispersion to obtain a water-phase solution; mixing trimesoyl chloride with n-hexane to obtain an organic phase solution; soaking the surface of the membrane with a water-phase solution and the organic-phase solution in sequence for reaction to obtain the composite polyamide nanofiltration membrane containing the silicon dioxide-polyion liquid particles. According to the method, the dispersity of the nanoparticles in the membrane and the electropositivity of the membrane can be improved, and the permeability of the membrane and the selectivity of part of heavy metal ions are effectively improved.

Description

technical field [0001] The invention belongs to the technical field of nanofiltration membrane preparation, and in particular relates to a preparation method of a polyamide composite nanofiltration membrane used for removing heavy metal pollutants. Background technique [0002] As a pressure-driven separation membrane, the nanofiltration membrane has a molecular pore size between the ultrafiltration membrane and the reverse osmosis membrane, and has the characteristics of low operating pressure and large flux. Traditional nanofiltration membranes use organic polymers as the basic material of the base membrane, while polyamide is still the main material for preparing the skin layer of nanofiltration membranes, and has been widely used in the water treatment industry. However, the traditional polyamide nanofiltration membrane faces the problem of low rejection of positive ions due to its negative charge. At the same time, due to the low mechanical strength and hydrophobicity o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D67/00B01D61/02B01D71/56C02F1/44C02F101/20
CPCB01D69/125B01D71/56B01D69/12B01D61/027C02F1/442C02F2101/20
Inventor 邢丁予沈启董文艺李婷
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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