Preparation and regeneration method of antibacterial and anti-pollution PVDF ultrafiltration membrane
An ultrafiltration membrane and anti-pollution technology, applied in ultrafiltration, chemical instruments and methods, membranes, etc., can solve problems such as solubility reduction, achieve the effect of improving the effect, prolonging the service life, and reducing the frequency of membrane replacement
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Embodiment 1
[0017] Example 1, 0.25 g of levofloxacin, 1.2 g of polyvinylpyrrolidone (K30), and 10 g of polyvinylidene fluoride were successively dissolved in 38.55 g of N,N-dimethylacetamide, stirred in a water bath at 55°C for 4 h, and a uniform The casting solution was then allowed to stand at room temperature for 24 h for defoaming. Cast the casting solution on a clean glass plate at room temperature, and use an adjustable scraper to scrape a filter membrane with a thickness of 110 μm; dry it in the air for 30 s; Medium coagulation bath; soak in pure water for 24 h to prepare ultrafiltration membrane.
[0018] The performance of the ultrafiltration membrane was measured, and the results are as follows. The membrane surface contact angle is 73.58°; the pure water membrane flux is 142.27 L / (m 2 h), the flux recovery rate was 83.62%, the irreversible pollution index was 19.22, and the bacteriostatic rate was 66.30%.
Embodiment 2
[0019] Example 2, 0.5 g of levofloxacin, 1.2 g of polyvinylpyrrolidone (K30), and 10 g of polyvinylidene fluoride were successively dissolved in 38.3 g of N,N-dimethylacetamide, stirred in a water bath at 55°C for 4 h, and a uniform The casting solution was then allowed to stand at room temperature for 24 h for defoaming. Cast the casting solution on a clean glass plate at room temperature, and use an adjustable scraper to scrape a filter membrane with a thickness of 110 μm; dry it in the air for 30 s; medium coagulation bath; soak in pure water for 24 hours to obtain an ultrafiltration membrane.
[0020] The performance of the ultrafiltration membrane was measured, and the results are as follows. The membrane surface contact angle is 70.23°; the pure water flux is 159.70 L / (m 2 h), the flux recovery rate was 92.08%, the irreversible pollution index was 11.7; the bacteriostasis rate was 92.12%.
Embodiment 3
[0021] Example 3, 0.75 g of levofloxacin, 1.2 g of polyvinylpyrrolidone (K30), and 10 g of polyvinylidene fluoride were successively dissolved in 38.05 g of N,N-dimethylacetamide, stirred in a water bath at 55°C for 4 h, and a uniform The casting solution was then allowed to stand at room temperature for 24 h for defoaming. Cast the casting solution on a clean glass plate at room temperature, and use an adjustable scraper to scrape a filter membrane with a thickness of 110 μm; dry it in the air for 30 s; Medium coagulation bath; soak in pure water for 24 h to prepare ultrafiltration membrane.
[0022] The performance of the ultrafiltration membrane was measured, and the results are as follows. The membrane surface contact angle is 65.96°; the pure water flux is 164.31 L / (m 2 h), the flux recovery rate was 85.22%, the irreversible pollution index was 16.23, and the bacteriostatic rate was 92.51%.
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