A nanofiber-based organic/inorganic composite nanofiltration membrane and its preparation method
A technology of nanofiber membrane and composite nanofiltration membrane, which is applied in the field of composite nanofiltration membrane and its preparation, can solve the problems of difficulty in maintaining the porous structure, difficulty in controlling the thickness, and low mechanical strength, so as to improve permeability and mechanical properties , Improve the effect of water flux
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Embodiment 1
[0058] (1) Weigh an appropriate amount of polyacrylonitrile powder and dissolve it in N,N'-dimethylformamide, heat and stir at 50°C for 6 hours, and prepare polyacrylonitrile / N,N'-di The methylformamide solution was stirred at 60° C. for 4 hours, and left to stand at room temperature for 12 hours to fully defoam to obtain an electrospinning solution.
[0059] (2) Add the prepared electrospinning solution into the syringe for electrospinning. The electrospinning parameters are as follows: the voltage is 15kV, the inner diameter of the spinneret is 0.2mm, the solution supply rate is 1mL / h, and the spinning ambient temperature The temperature is 25°C, the receiving distance is 23cm, and the rotating speed of the receiving drum is 80r / min. After spinning, the nanofiber membrane is heat-treated at 70°C in a constant temperature drying oven for 12h. After taking it out, the nanofiber membrane was cut into 6×6cm membranes, and post-processed on a hot press (pressure of 1 MPa, holding...
Embodiment 2～4
[0061] The mass fraction of polyacrylonitrile in the spinning solution was adjusted, and the rest of the conditions were the same as in Example 1.
Embodiment 5
[0072] (1) Weigh an appropriate amount of polyacrylonitrile powder and dissolve it in N,N'-dimethylformamide, heat and stir at a constant temperature of 50°C for 6h, and prepare polyacrylonitrile / N,N'-di The methylformamide solution was stirred at 60° C. for 4 hours, and left to stand at room temperature for 12 hours to fully defoam to obtain an electrospinning solution.
[0073] (2) Add the prepared electrospinning solution into the syringe for electrospinning. The electrospinning parameters are as follows: the voltage is 15kV, the inner diameter of the spinneret is 0.2mm, the solution supply rate is 1mL / h, and the spinning ambient temperature The temperature is 25°C, the receiving distance is 23cm, and the rotating speed of the receiving drum is 80r / min. After spinning, the nanofiber membrane is heat-treated at 70°C in a constant temperature drying oven for 12h. After taking it out, the nanofiber membrane was cut into 6×6cm membranes, and post-processed on a hot press (press...
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