Compound nanofiltration membrane for dye desalination and treatment of waste water during dye desalination, as well as preparation method of compound nanofiltration membrane
A composite nanofiltration membrane and wastewater treatment technology, which is applied in the direction of osmosis/dialysis water/sewage treatment, general water supply saving, chemical instruments and methods, etc., can solve the problems that limit the wide application of membrane technology, the surface inorganic materials are easy to fall off, and improve the application technology Cost and other issues, to achieve good dye desalination performance, high practical value, improve the effect of interception performance
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[0020] Example 1
[0021] (1) Immerse the polyvinylidene fluoride (PVDF) hollow fiber membrane in 1 mol / L NaOH alkali solution at 60°C for 30 minutes, and then wash with distilled water until the solution is neutral;
[0022] (2) Immerse the treated hollow fiber membrane in a PVA solution with a mass fraction of 0.5%, take it out to dry, and then immerse it in a 30°C glutaraldehyde with a mass fraction of 3% and concentrated sulfuric acid with a mass fraction of 6% crosslink in ethanol solution for 10 min. The above process was soaked in the PVA coating solution three times, respectively, for 10 minutes, 10 minutes, and 1 minute, and each time after drying, they were cross-linked with a cross-linking agent solution for 10 minutes.
[0023] (3) The hollow fiber composite membrane coated and crosslinked 3 times was then placed in an oven at 100° C. for heat setting for 10 minutes.
[0024] (4) Using 50ppm of Congo red (molecular weight: 696.68 Daltons), methyl orange (molecula...
Example Embodiment
[0025] Example 2
[0026] (1) Immerse the PVDF hollow fiber membrane in 1 mol / L KOH alkali solution at 40°C for 30 minutes, and then wash with distilled water until the solution is neutral;
[0027] (2) Immerse the alkali-treated hollow fiber membrane into PVA with a mass fraction of 1%, nano-titanium dioxide (nano-TiO 2 ) with a mass fraction of 0.1% PVA / nano-TiO 2 In aqueous solution, take it out to dry after 10 minutes. Then, it was immersed in an ethanol solution with a mass fraction of succinic acid of 3% and a mass fraction of acid catalyst of 1% at 40°C. After cross-linking treatment for 10 minutes, it was taken out to dry, and the immersion coating and cross-linking treatment were repeated twice. ;
[0028] (3) The hollow fiber composite membrane coated and cross-linked for 3 times was then placed in an oven at 100° C. for heat-setting for 10 minutes.
[0029] (4) Test the performance of the composite membrane with 50ppm of Congo red, methyl orange and methyl blue ...
Example Embodiment
[0030] Examples 3-6
[0031] Keep the content and temperature of lye and crosslinker solution unchanged, change the mass fraction of PVA and nano-TiO 2 and other operating conditions are the same as in Example 1:
[0032] Table 1. Examples 3-6 specific embodiments:
[0033]
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