Hollow fiber forward osmosis composite membrane containing oriented carbon nanotubes and preparation method thereof
A technology of carbon nanotubes and composite membranes, applied in semipermeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems that it is difficult to give full play to the transmission function of carbon nanotube molecular channels, and achieve excellent separation characteristics and high density , Improve the effect of salt rejection rate
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[0045] Example 1:
[0046] This embodiment provides a method for preparing a hollow fiber membrane containing 1% (wt) oriented carbon nanotubes. The operation process is as follows figure 1 shown, the specific steps are as follows:
[0047] (1) Disperse 0.2 g of acidified multi-walled carbon nanotubes in 80 g of N-N dimethylformamide, and disperse uniformly after ultrasonication for 2 h, add 1 g of polyvinylpyrrolidone (weight average molecular weight: 2000) and 18.8g polysulfone (weight average molecular weight is 30000), after stirring for 4h, a uniform casting liquid is formed;
[0048] (2) Pour the casting solution into the spinner still, seal the spinner still, heat the spinner still, make the temperature of the spinning stock solution at 25°C, and vacuum and defoaming for 30 minutes. After the spinning material solution is defoamed, turn on the outlet switch of the kettle, pressurize nitrogen into the kettle, turn on the switch of the metering pump, adjust the speed to...
Example Embodiment
[0051] Example 2-4:
[0052] Only changing the content of modified carbon nanotubes to 0.05g, 0.5g and 1g, the amount of polysulfone correspondingly changed to 18.95g, 18.5g, 18g, other operations were the same as in Example 1, and the densities of the obtained oriented carbon nanotubes were averaged respectively. The forward osmosis properties of the obtained hollow fiber composite membranes were measured at 1, 3.2, and 4.5 per square micrometer, and the results are shown in Table 1.
Example Embodiment
[0053] Example 5
[0054] The embodiment is the same as in Example 1, only the type of carbon nanotubes is changed, acidified single-walled carbon nanotubes are selected, and the density of the obtained oriented carbon nanotubes is 2.9 per square micrometer on average. characteristics, the results are shown in Table 1.
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