Based on non-metal multi-doped ntio 2 Visible light-catalyzed flat-plate ultrafiltration membrane and preparation method thereof
A multi-doped, non-metallic technology, applied in chemical instruments and methods, physical/chemical process catalysts, organic compound/hydride/coordination complex catalysts, etc., can solve the problem of inability to prepare separation membranes and complicated separation membrane preparation processes , did not pass and other problems, to achieve good photocatalytic degradation performance and anti-pollution performance, anti-pollution and visible light catalytic activity improvement, resistance increase coefficient and contact angle reduction effect
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Embodiment 1
[0026] 71.0% (w / w) of dimethylacetamide, 13.0% (w / w) of polyethylene glycol 400, 0.5% (w / w) of Tween-80 and 2.5% (w / w) of sulfur nitrogen doped nTiO 2 Add them into three-neck round-bottomed flasks according to a certain order, and stir evenly; then add 13.0% (w / w) polysulfone, and stir and dissolve at 70°C for 7 hours until completely dissolved; then, the obtained casting solution Stand still for 16 hours at the temperature of stirring and dissolving to remove the remaining air bubbles in the casting solution.
[0027] Pour the defoamed casting solution on a clean glass plate, use a special flat film scraper to scrape it into a film, stay in the air for 15 seconds, and then immerse it in a constant temperature coagulation bath at 25°C to solidify and form. After the film is formed, it will automatically Take the film out of the glass plate, wash it with deionized water for 24 hours, and soak it in 50% glycerol for 48 hours to prepare nTiO based on sulfur and nitrogen doping....
Embodiment 2
[0030] Doping nTiO with sulfur and nitrogen 2 Content is reduced to 0.05% (w / w) by 2.5% (w / w), and the content of dimethylacetamide is increased to 73.45% (w / w) by 71.0% (w / w), all the other are the same as embodiment 1 . Then the prepared nTiO based on sulfur and nitrogen doping 2 The pure water flux of the visible light-catalyzed flat-plate ultrafiltration membrane is 403.95 L / m 2 ·hr·0.1MPa, the retention rate of bovine serum albumin was 92.14%, the coefficient of resistance increase was 1.73, and the contact angle was 84.4°; the degradation and removal rate of fulvic acid increased from 28.63% (without light, running for 1 hour) to 39.72 % (under simulated visible light, run for 1 hour).
Embodiment 3
[0032] Doping nTiO with sulfur and nitrogen 2 Content is brought up to 5.0% (w / w) by 2.5% (w / w), and the content of dimethylacetamide is reduced to 68.5% (w / w) by 71.0% (w / w), and all the other are with embodiment 1 . Then the prepared nTiO based on sulfur and nitrogen doping 2 The pure water flux of the visible light-catalyzed flat-plate ultrafiltration membrane is 507.51 L / m 2 ·hr·0.1MPa, the bovine serum albumin retention rate is 91.13%, the resistance increase coefficient is 1.28, and the contact angle is 71.5°; the degradation and removal rate of fulvic acid is increased from 41.57% (no light, run for 1 hour) to 68.46 % (under simulated visible light, run for 1 hour).
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