A kind of nano fiber cation exchange membrane and its preparation method and application
A technology of cation exchange membrane and nanofiber, which is applied in the field of nanofiber cation exchange membrane and its preparation, can solve the problems of not fully meeting the requirements of use, small packing density, long residence time, etc., and achieve stable structure, good membrane performance, and preparation The effect of simple method
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Embodiment 1
[0030] A nanofiber cation exchange membrane prepared by the following steps:
[0031] 1) Preparation of electrospinning solution
[0032] Prepare a mixed aqueous solution of polyvinyl alcohol (PVA, degree of hydrolysis > 98%, molecular weight about 70,000) and polystyrene sodium sulfonate (PSSNa), the mass ratio of PVA / PSSNa is 1: 0.8~1.5, and the total concentration of the solution is 8- 14%.
[0033] 2) Electrospinning
[0034] Typical parameters of electrospinning: positive voltage is 10~15KV, negative voltage is -1~-3KV, receiving distance is 12-15cm; propulsion rate: 0.2-0.3mL / h; three needles are sprayed side by side, needle type 23G ( The inner diameter is 0.33mm, the outer diameter is 0.64mm); the speed of the receiving roller is 100rpm; the translation stroke is 200mm.
[0035] During the spinning process, the spinning state should be observed, and the parameter conditions should be adjusted in time to make the spinning process continuous, the fiber shape is good, ...
Embodiment 2
[0045] Membrane filtration devices such as Figure 8 Shown, heavy metal-containing wastewater (in the form of Cu 2+ For example) Enter from the upper end of the device, flow out from the lower end after passing through the ion exchange membrane, control the pressure and flow rate with the height of the water column, or control the flow rate by connecting a peristaltic pump from the lower end of the device.
[0046] Membrane filtration effect (influent concentration Cu 2+ =5mg / L), such as Figure 9 As shown, the filter membrane (dry weight 0.251g) can remove Cu 2+ The ion concentration is reduced to close to 0, and the processing capacity is close to 800mL.
[0047] After membrane filtration breakthrough, use 5% NaCl solution to desorb and regenerate, the results are as follows Figure 10 As shown, the regeneration performance of the ion exchange membrane is good, and the desorption rate is 100%.
Embodiment 3
[0049] Cyclic adsorption-desorption experiment: Weigh 0.2g dry ion exchange membrane into a 100mL Erlenmeyer flask, add 50mL Cu 2+ A solution with a concentration of 10mg / L was oscillated (120rpm) at room temperature for 15 hours to absorb, and a sample was taken to measure the copper concentration in the water. The solution in the Erlenmeyer flask was poured out and drained, and 20mL of 2mol / L NaCl solution was added, and desorbed by shaking at room temperature for 8 Hours, the supernatant was poured out, and a small amount of water was added to wash the membrane and drained, and 50 mL of copper solution was added for adsorption. This cycle of adsorption-desorption 15 times, the adsorption effect can be seen Figure 11 , Cu 2+The removal rate is always above 98%, and the prepared ion-exchange membrane can be used repeatedly with stable performance.
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