A kind of preparation method of low pressure positive charge hollow fiber nanofiltration membrane
A positive charge and 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 high separation and softening efficiency, strong anti-pollution ability, and long service life.
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Embodiment 1
[0031] (1) Pretreatment of ultrafiltration membrane: Put the polyethersulfone hollow fiber ultrafiltration membrane into distilled water and soak for 24h
[0032] (2) Configuration of water phase solution:
[0033] 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.
[0034] (3) Configuration of oil phase solution:
[0035] Take 0.15 g trimesoyl chloride and add it to 99.85 g n-hexane to obtain an oil phase solution.
[0036] (4) Interface polymerization process:
[0037] Fully contact the hollow fiber membrane with the water phase solution for 15 minutes, then remove the excess water on the surface, and then fully contact 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.
[0038] The performance of the compos...
Embodiment 2
[0040] (1) Pretreatment of ultrafiltration membrane: Put the polypropylene hollow fiber ultrafiltration membrane into distilled water and soak for 24h
[0041] (2) Configuration of water phase solution:
[0042] Weigh 2.0g m-phenylenediamine, 0.10g potassium lauric acid, 1.0g triethylamine, and 1.50g double-walled carbon nanotubes into 95.60g distilled water to completely dissolve them, adjust the pH to 11 with potassium hydroxide. The aqueous phase solution is obtained.
[0043] (3) Configuration of oil phase solution
[0044] Take 0.25g trimesoyl chloride and add it to 99.75g n-hexane to obtain an oil phase solution.
[0045] (4) Interface polymerization process:
[0046] Fully contact the hollow fiber membrane with the water phase solution for 5 minutes, then remove the excess water on the surface, and then fully contact 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.
[0047] The performance of the compo...
Embodiment 3
[0049] (1) Pretreatment of ultrafiltration membrane: Put the hollow fiber ultrafiltration membrane into distilled water and soak for 24h
[0050] (2) Configuration of water phase solution:
[0051] Weigh 3.0g m-phenylenediamine, 0.25g sodium succinate sulfonate, 0.3g triethylamine, 1.50g double-walled carbon nanotubes into 95.60g distilled water, completely dissolved, adjust the pH to 12 with calcium hydroxide , That is, the aqueous phase solution.
[0052] (3) Configuration of oil phase solution:
[0053] Take 0.25g trimesoyl chloride and add it to 99.75g n-hexane to obtain an oil phase solution.
[0054] (4) Interface polymerization process:
[0055] Fully contact the hollow fiber membrane with the water phase solution for 5 minutes, then remove the excess water on the surface, and then fully contact 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.
[0056] The performance of the composite membrane was test...
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