A positively charged polyamide/tio 2 Preparation method of ceramic hollow fiber composite nanofiltration membrane and nanofiltration membrane
A fiber composite and polyamide technology, which is applied in the field of positively charged polyamide/TiO2 ceramic hollow fiber composite nanofiltration membrane and its preparation, can solve the problems of high environmental requirements and complicated operation, and achieve simple preparation process and mild reaction conditions , the effect of high salt rejection rate
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[0042] (1) Preparation of the base film: Prepare the casting solution according to the ratio of polyethersulfone: polyvinylpyrrolidone: N-methylpyrrolidone: α-alumina = 1-20:0.1-8: 30-60:30-70, The hollow fiber membrane is spun by the phase inversion method, placed in a muffle furnace to program the temperature to 1000-1700°C, and kept for 1-6 hours to obtain a ceramic hollow fiber base membrane;
[0043] (2) Pretreatment of the base membrane: take the ceramic hollow fiber microfiltration membrane as the base membrane, soak it in 0.1-1.0mol / L sodium hydroxide solution for 5-10h, take it out and ultrasonically clean it several times, and place it in an oven at 50-70°C to completely dry the basement film;
[0044] (3) Surface modification of the base film: adding polyvinylpyrrolidone (2-8g / 100mL) and polyvinyl alcohol (0.1-2g / 100mL) to the titanium sol to adjust the viscosity of the sol. After immersing the pretreated ceramic base film in titanium sol, dry it at room temperatur...
Embodiment 1-5
[0046] Polyamide / TiO 2 Preparation of composite nanofiltration membrane:
[0047] The sol-modified basement membrane was immersed in the aqueous phase solution for 15s, and then the solution was removed. After being placed in the air for 30s, it was immersed in the organic phase solution for 20s for interfacial polymerization, and then the organic solution on the membrane surface was removed to prepare a nanofiltration membrane.
[0048] The content of polyethyleneimine in the aqueous phase is 0.3% (w / v), 0.6% (w / v), 0.9% (w / v), 1.2% (w / v), 1.5% (w / v ). The organic phase is 0.15% (w / v) trimesoyl chloride n-hexane solution.
[0049] The polyamide / TiO that embodiment 1-5 makes 2 The nanofiltration membrane was tested for water flux and salt rejection performance, and the test results are shown in Table 1
[0050] Embodiments 1-5 mainly consider the influence of the concentration of the aqueous phase on the performance of the nanofiltration membrane.
[0051]
Embodiment 6-9
[0053] Substantially the same as Example 3, keep the polyethyleneimine content in the water phase as 0.9% (w / v) constant, adjust the content of trimesoyl chloride in the organic phase, investigate the effect of trimesoyl chloride content on nanofiltration membrane performance influences.
[0054] The nanofiltration membrane prepared in Examples 6-9 was tested for water flux and salt interception performance, and the test results are as follows.
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