Application of a graphitic carbon nitride two-dimensional nanosheet membrane in ion separation
A graphite phase carbon nitride, two-dimensional nanotechnology, applied in the field of membrane separation, can solve the problems of difficult metal ion or salt separation, and achieve the effect of excellent separation performance and broad application prospects.
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Embodiment 1
[0039] (1) Weigh 3g of cyanamide and lay it flat on a porcelain boat, put it into a tube furnace, and calcinate at 450°C for 2h in an inert atmosphere with a heating and cooling rate of 1°C / min to obtain the bulk g-C 3 N 4 ;
[0040] (2) Use the dry milling method to make the bulk phase g-C 3 N 4 Ball milled at 2000rpm for 2h to obtain powder; disperse the powder in isopropanol at a concentration of 3mg / mL to form a suspension, stir at 300rpm for 8h, and then ultrasonicate at room temperature for 3h (ultrasonic power is 250w, frequency 40KHz), and let it stand for 10h, centrifuged at 3500rpm for 10min, repeated centrifugation until the supernatant was free of precipitation, and the supernatant was taken as g-C 3 N 4 Two-dimensional nanosheet solution;
[0041] (3) Adopt 2mol / L citric acid solution to adjust the pH of the nanosheet solution obtained in step (2) to be neutral (about 7); take the anodized alumina with a pore diameter of 160nm as the substrate, and anodized a...
Embodiment 2
[0047] (1) Weigh 5g of dicyandiamide, spread it on a porcelain boat, put it into a tube furnace, and calcinate at 850°C for 3h in an inert atmosphere, with a heating and cooling rate of 6°C / min, to obtain the bulk g-C 3 N 4 ;
[0048] (2) The bulk phase g-C 3 N 4 Mix with isopropanol at a concentration of 1g / mL, ball mill at a speed of 3000rpm for 5h to obtain a powder; disperse the powder in methanol at a concentration of 6mg / mL to form a suspension, stir at a speed of 500rpm for 12h, and then Sonicate for 25 hours, let stand for 24 hours, centrifuge at 9000rpm for 10 minutes, repeat the centrifugation until the supernatant has no precipitation, and take the supernatant as g-C 3 N 4 Two-dimensional nanosheet solution;
[0049] (3) Adopting 2mol / L acetic acid solution to regulate the pH of the nanosheet solution obtained in step (2) is about 7, and the polyethersulfone filter membrane with a pore size of 200nm is used as the substrate, and the polyethersulfone filter memb...
Embodiment 3
[0054] (1) Weigh 4g of dicyandiamide, spread it on a porcelain boat, put it into a tube furnace, and calcinate it at 550°C for 6h in an inert atmosphere, with a heating and cooling rate of 3°C / min, to obtain the bulk g-C 3 N 4 ;
[0055] (2) The bulk phase g-C 3 N 4 Mix with methanol at a concentration of 1g / mL, ball mill at a speed of 2500rpm for 3h to obtain a powder, disperse the powder at a concentration of 5mg / mL in dimethylformamide to form a suspension, and stir at a speed of 400rpm for 10h, Then ultrasonic at room temperature for 10 hours, and let it stand for 12 hours, centrifuge at 5000rpm for 10 minutes, repeat the centrifugation until the supernatant has no precipitation, and take the supernatant as g-C 3 N 4 Two-dimensional nanosheet solution;
[0056] (3) Add the calcium hydroxide solution that step (2) obtains to the calcium hydroxide solution of 2mol / L and adjust pH to be about 7, be the nylon 66 filter membrane of 180nm with aperture as base, polynylon 66...
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