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Preparation method of low-voltage positive charge hollow fiber nanofiltration membrane

A positive charge, nanofiltration membrane technology, applied in the field of membrane preparation, can solve the problems of low flux, poor anti-pollution performance and high cost of composite membranes, and achieve the effects of high separation and softening efficiency, strong anti-pollution ability and long service life.

Inactive Publication Date: 2016-04-20
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] CN104667759A discloses a high-flux composite anti-pollution nanofiltration membrane, by adding inorganic nanoparticles in the base membrane, and then coating the surface of the base membrane with a polyamide functional layer to obtain a high-performance composite nanofiltration membrane, but the flat membrane nanofiltration Membranes have disadvantages such as small specific surface area, low bulk density, high requirements for feed liquid, and high cost.
In 2014, Wei publicly reported the preparation of positively charged hollow fiber composite nanofiltration membranes on the inner surface of polyethersulfone hollow fiber membranes through water phase PEI and oil phase TMC. 2+ The rejection rate is as high as 97%, and the water flux is also higher than that of the flat composite nanofiltration membrane, but it has disadvantages such as poor anti-pollution performance
CN1785488 discloses a preparation method of a polymer hollow fiber composite nanofiltration membrane. The external pressure type composite nanofiltration membrane is prepared by coating a polyamide functional layer on the outer surface of the hollow fiber membrane, and the interception efficiency of the divalent salt reaches more than 90%. But the flux of this composite membrane is low, only 3.08L / (m 2 .h.bar)
[0005] At present, there are many patents related to polyamide composite nanofiltration membranes, but the positively charged hollow fiber composite nanofiltration membranes are prepared based on polyamide composites, and hollow fiber composite nanofiltration membranes are prepared by adding carbon nanotube materials to the water phase and oil phase respectively. filter membrane to improve the water flux, fouling resistance and antibacterial performance of the membrane has not been reported

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Pretreatment of ultrafiltration membrane: soak polyethersulfone hollow fiber ultrafiltration membrane in distilled water for 24h

[0037] (2) Configuration of aqueous solution:

[0038] Weigh 1g of m-phenylenediamine, 0.5g of sodium lauryl sulfate, 1g of triethylamine, and 0.5g of single-walled carbon nanotubes into 98g of distilled water, dissolve them completely, and adjust the pH to 10 with sodium hydroxide to obtain aqueous solution.

[0039] (3) Configuration of oil phase solution:

[0040] Take 0.15g of trimesoyl chloride and add it to 99.85g of n-hexane to obtain an oil phase solution.

[0041] (4) Interface polymerization process:

[0042] Fully contact the hollow fiber membrane with the water phase solution for 15 minutes, then remove excess water on the surface, then fully contact with the oil phase solution for 120 seconds, then put it in an oven at 40°C for 5 minutes, and then put it in pure water for storage.

[0043] The performance of the composit...

Embodiment 2

[0045] (1) Pretreatment of ultrafiltration membrane: soak polypropylene hollow fiber ultrafiltration membrane in distilled water for 24h

[0046] (2) Configuration of aqueous solution:

[0047] Weigh 2.0g of m-phenylenediamine, 0.10g of potassium laurate, 1.0g of triethylamine, and 1.50g of double-walled carbon nanotubes into 95.60g of distilled water, dissolve completely, and adjust the pH to 11 with potassium hydroxide. That is, an aqueous solution is obtained.

[0048] (3) Configuration of oil phase solution

[0049] Take 0.25g of trimesoyl chloride and add it into 99.75g of n-hexane to obtain an oil phase solution.

[0050] (4) Interface polymerization process:

[0051] Fully contact the hollow fiber membrane with the water phase solution for 5 minutes, then remove excess water on the surface, then fully contact with the oil phase solution for 60 seconds, then put it in an oven at 60°C for 10 minutes, and then put it in pure water for storage.

[0052] Using 1g / L calcium...

Embodiment 3

[0054] (1) Pretreatment of ultrafiltration membrane: soak the hollow fiber ultrafiltration membrane in distilled water for 24 hours

[0055] (2) Configuration of aqueous solution:

[0056] Weigh 3.0g of m-phenylenediamine, 0.25g of sodium succinate sulfonate, 0.3g of triethylamine, and 1.50g of double-walled carbon nanotubes into 95.60g of distilled water, dissolve completely, and adjust the pH to 12 with calcium hydroxide. , to obtain an aqueous solution.

[0057] (3) Configuration of oil phase solution:

[0058] Take 0.25g of trimesoyl chloride and add it into 99.75g of n-hexane to obtain an oil phase solution.

[0059] (4) Interface polymerization process:

[0060] Fully contact the hollow fiber membrane with the water phase solution for 5 minutes, then remove excess water on the surface, then fully contact with the oil phase solution for 60 seconds, then put it in an oven at 60°C for 10 minutes, and then put it in pure water for storage.

[0061] Using 1g / L calcium chl...

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Abstract

The invention relates to a preparation method of a low-voltage positive charge hollow fiber nanofiltration membrane and belongs to the technical field of membrane preparation. The preparation method comprises the following steps: firstly pretreating by immersing a hollow fiber ultrafilter membrane into distilled water; then successively adding carbon nanotube, m-phenylenediamine, a surfactant, an acid binding agent and a pH regulator into deionized water to prepare a water-phase solution with pH of 8-12; adding trimesoyl chloride into an organic solvent, mixing and dissolving to obtain an oil-phase solution; and finally carrying out a reaction by letting the hollow fiber membrane be contacted with the water-phase A solution, carrying out a reaction by letting the hollow fiber membrane be contacted with the oil-phase solution, drying and preserving so as to obtain the low-voltage positive charge hollow fiber nanofiltration membrane. The prepared nanofiltration membrane has advantages of high water flux, high separation efficiency of divalent saline ions and above, strong anti-pollution ability, long service life and the like.

Description

technical field [0001] The invention relates to a preparation method of a low-voltage positively charged hollow fiber nanofiltration membrane, in particular to a preparation method of a composite nanofiltration membrane modified by carbon nanotubes, and belongs to the technical field of membrane preparation. Background technique [0002] As a high-tech developed in recent years, membrane separation technology has the advantages of energy saving, high quality, and almost no pollution. Compared with reverse osmosis, nanofiltration membrane has the advantages of high water flux and low operating pressure, and has broad application prospects in water softening, desalination, wastewater treatment and other fields . [0003] At present, commercial nanofiltration membranes are mostly negatively charged nanofiltration membranes (under the condition of neutral water pH), such as Film-Tec's NF series nanofiltration membranes, Nitto-Denko's NTR series nanofiltration membranes, and VIT...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/08B01D69/12
CPCB01D67/00B01D69/08B01D69/12B01D2323/12B01D2323/26B01D2323/46B01D2323/48B01D2325/16
Inventor 赵长伟李希鹏张盼盼徐毅
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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