Preparation method and application of conductive polymer/carbon nanotube composite nanofiltration membrane
A carbon nanotube composite and conductive polymer technology, applied in the field of water treatment, can solve the problem of low permeability-selectivity monovalent ion selectivity, and achieve simple preparation process, excellent electrical conductivity, and controllable nanofiltration membrane structure Effect
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Embodiment 1
[0025] (1) Disperse carbon nanotubes in a mixed acid solution of 70 wt.% concentrated nitric acid and concentrated sulfuric acid with a v / v ratio of 1:3, and oxidize at 60° C. for 60 min. Then dilute the concentrated acid solution with high-purity water, and then vacuum filter, separate, wash and dry to obtain the oxidized carbon nanotubes. Subsequently, oxidized carbon nanotubes were dispersed into high-purity water to prepare 0.5 mg mL -1 carbon nanotube dispersion. Take 10 mL of the dispersion, vacuum filter it onto a polyvinylidene fluoride film substrate, and dry it at 60° C. to obtain a carbon nanotube film. After immersing the prepared carbon nanotube film in 0.1M aniline solution (which contains 1.0% polyacrylic acid by mass fraction) for 10min, take out and remove the extra solution on the surface, and then place the film in 0.1M ammonium persulfate solution , reacted at 4°C for 10 minutes, took it out, and continued to react at 4°C for 6 hours. Then the prepared m...
Embodiment 2
[0028] (1) Disperse carbon nanotubes in a mixed acid solution of 70 wt.% concentrated nitric acid and concentrated sulfuric acid with a v / v ratio of 1:3, and oxidize at 80° C. for 30 minutes. Then dilute the concentrated acid solution with high-purity water, and then vacuum filter, separate, wash and dry to obtain the oxidized carbon nanotubes. Subsequently, oxidized carbon nanotubes were dispersed into high-purity water to prepare 0.5 mg mL -1 carbon nanotube dispersion. 15 mL of the dispersion was taken, vacuum filtered onto a polyethersulfone membrane substrate, and dried at 80° C. to obtain a carbon nanotube membrane. After immersing the prepared carbon nanotube film in 0.15M pyrrole solution (which contains 1.5% polystyrene sulfonic acid by mass fraction) for 20min, take out and remove the extra solution on the surface, and then place the film in a 0.1M process In hydrogen oxide solution, react at 0°C for 15 minutes, take it out, and continue to react at 0°C for 12h. T...
Embodiment 3
[0031] (1) Disperse carbon nanotubes in a mixed acid solution of 70 wt.% concentrated nitric acid and concentrated sulfuric acid with a v / v ratio of 1:3, and oxidize at 60° C. for 90 minutes. Then dilute the concentrated acid solution with high-purity water, and then vacuum filter, separate, wash and dry to obtain the oxidized carbon nanotubes. Subsequently, oxidized carbon nanotubes were dispersed into high-purity water to prepare 0.5 mg mL -1 carbon nanotube dispersion. Take 15 mL of the dispersion liquid, vacuum filter it onto the polyvinylidene fluoride film substrate, and dry it at 80°C to obtain a carbon nanotube film. After immersing the prepared carbon nanotube film in 0.15M 3-methylthiophene solution (which contains 1.5% polyallylamine hydrochloride by mass fraction) for 10 min, take out and remove the extra solution on the surface, and then place the film on In 0.2M ferric chloride solution, react at 20°C for 30min, take it out, and continue to react at 20°C for 24...
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