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Nanofiltration membrane with nanometer hybridized desalination layer

A desalination layer and nanofiltration membrane technology, applied in the field of nanofiltration membranes, can solve problems such as unsatisfactory temperature stability and low pollution capacity, and achieve the effects of improving organic pollution resistance, high removal rate, and high ion selectivity

Active Publication Date: 2013-03-20
VONTRON TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a nanofiltration membrane with a nano-hybrid desalination layer and a preparation method thereof, which solves the ion selectivity, low pollution ability and temperature of the functional desalination layer of the high-selectivity composite nanofiltration membrane in the prior art Unsatisfactory stability issues

Method used

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Examples

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Effect test

Embodiment 1

[0032] A nanofiltration membrane with a nano-hybrid desalination layer according to the present invention is mainly prepared according to the following steps:

[0033] (1) Pre-dispersion of nanoparticles: Take 100g of titanium dioxide nanoparticles (particle size: 60nm) and disperse them in 1900g of deionized water. After stirring evenly, use high-power ultrasonic waves for ultrasonic dispersion treatment, and obtain titanium dioxide nano-dispersion liquid after ultrasonication for 6 hours;

[0034] (2) Preparation of solution A: Dissolve 11g of anhydrous piperazine in 989g of the titanium dioxide nano-dispersion described in step (1) to prepare a solution with a m-diphenylamine concentration of 1.1wt%, stir evenly, and after the dissolution is complete, use an appropriate pH The reagent sodium hydroxide was adjusted, the mixed solution was stirred and dissolved, and the pH of the final solution was adjusted to 12 to prepare the A solution, and the obtained A solution was continu...

Embodiment 2

[0040] (1) Pre-dispersion of nanoparticles: Take 100g of titanium dioxide nanoparticles (particle size: 500nm) and disperse them in 1900g of deionized water. After stirring evenly, use high-power ultrasonic waves for ultrasonic dispersion treatment, and obtain titanium dioxide nano-dispersion liquid after ultrasonication for 6 hours;

[0041] (2) Preparation of A solution: Dissolve 11g of anhydrous piperazine in 989g of the titanium dioxide nano-dispersion liquid described in step (1) to prepare a solution with a combined concentration of p-diphenylamine and m-diphenylamine of 0.5wt%, stir evenly, and dissolve completely Finally, after adding an appropriate amount of pH adjusting reagent sodium hydroxide to adjust the final pH of the solution to 11, the A solution was prepared, and the obtained A solution was continued to be treated with ultrasound for 5 h. The concentration of nanoparticles in solution A is 50wt%.

[0042] (3) Preparation of solution B: Dissolve 23.4g of trim...

Embodiment 3

[0047] (1) Pre-dispersion of nanoparticles: Take 100g of titanium dioxide nanoparticles (with a particle size of 200nm) and disperse them in 1900g of deionized water, after stirring evenly, use high-power ultrasonic waves for ultrasonic dispersion treatment, and obtain titanium dioxide nano-dispersions after ultrasonication for 6 hours;

[0048] (2) Preparation of A solution: Dissolve 11g of anhydrous piperazine in 989g of the titanium dioxide nano-dispersion liquid described in step (1) to prepare a solution with a piperazine concentration of 1.5wt%, stir evenly, and after dissolution is complete, add an appropriate amount of pH adjustment After adjusting the pH of the final solution to 11 with sodium hydroxide as a reagent, the A solution was prepared, and the obtained A solution was continued to be treated with ultrasound for 2 h. The concentration of nanoparticles in solution A is 20wt%.

[0049] (3) Preparation of solution B: Dissolve 23.4g of trimesoyl chloride in 976.6g...

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Abstract

The invention discloses a nanofiltration membrane with a nanometer hybridized desalination layer. The desalination layer formed through interphase hybridization of an inorganic nanoparticle with a particle size of 1 to 1000 nm and polyamide or polyimide is arranged on a porous supporting layer of the membrane. A preparation method for the nanofiltration membrane mainly comprises the following steps: pre-dispersion of the nanoparticle, preparation of a solution A, preparation of a solution B, interfacial polymerization, surface polishing and roller squeezing, rinsing with deionized water, moisture retention with glycerin and drying, wherein air drying and sulfonation can be carried out after surface polishing and roller squeezing. According to the invention, nanometer hybridization effects of a high polymer nano-material in the nanofiltration membrane are made full use of, so hydrophilic performance, antioxidation performance and anti-pollution performance of the nanofiltration membrane are improved, and the nanofiltration membrane has the advantages of low pollution, great flux and a high removal rate. The preparation method is scientific and reasonable, enables the nanometer composite nanofiltration membrane with a specific nanoparticle and polyamide hybridized desalination layer to be prepared and has higher ion selectivity, low pollution capability and temperature stability.

Description

technical field [0001] The invention relates to a nanofiltration membrane with a nanometer hybrid desalination layer and a preparation method thereof, belonging to the technical field of nanofiltration membranes. Background technique [0002] Nanofiltration is a pressure-driven membrane separation process between reverse osmosis and ultrafiltration. Nanofiltration membrane is a functional semi-permeable membrane that allows solvent molecules or some low-molecular-weight solutes or low-priced ions to pass through. It is a special and promising type of separation membrane, named for its surface pore size of nanometer scale and the ability to intercept nanoscale (0.001 micron) substances; it intercepts organic matter with a molecular weight of about 150-500, and intercepts dissolved The ability of neutral salts is between 2% and 98%, and the desalination of monovalent anion salt solutions is lower than that of high-valent anion salt solutions. Since the 1980s, various nanofilt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D69/02
Inventor 梁松苗吴宗策许国扬陶健金焱
Owner VONTRON TECH CO LTD
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