Hollow Fiber Ultrafiltration Membrane Catalyzed by Bismuth Tungstate

In modern industrial production, ultrafiltration membrane is a commonly used filter product. Membrane separation technology is a new and efficient separation technology. It can meet the needs of modern industrial energy saving, improving production efficiency, reusing raw materials and eliminating environmental pollution.

In the field of photocatalysis, an effective solution to the inadequacies of ultrafiltration membranes is to dope metal-semiconductor photocatalysts, such as thorium tungstate, using metal surface plasmons and their mutual promotion. It effectively prevented the recombination of photo generated electron hole pairs, greatly enhanced the photocatalytic activity. Due to the role of metal ions, the range of photosensitive wavelength was widened, the utilization of sunlight was increased, and the photocatalytic activity was greatly increased.

A preparation method of a bismuth tungstate hollow fiber ultrafiltration membrane includes the following steps:

(1)The solvent, osmium tungstate, porogen, surfactant, hydrophilic agent and additive are successively added to the dissolving tank and stirred until completely dissolved;

(2)The polymer film material is added to the resultant in step (1), stirred at 40℃ until completely dissolved, then naturally cooled to room temperature, and left to stand for 24 h to obtain a casting liquid;

(3)Using the traditional dry-wet spinning process, control the flow rate of the casting film is 5mL/min, the temperature of the casting film is 50 ℃, the ultrapure water coagulation bath temperature is 15 ℃, the setting time is 2min;

(4)Immerse and rinse the products obtained from step 3 in ultrapure water and then immerse 36h in 50% glycerol solution. Finally, the photocatalytic hollow fiber ultrafiltration membrane is prepared by drying at room temperature.

The results showed that the anti-fouling property of the composite ultrafiltration membrane was greatly improved. The prepared thorium tungstate photocatalyst hollow fiber ultrafiltration membrane exhibited good photocatalytic degradation performance and resistance when operated under simulated visible light. Contamination performance, membrane flux decay significantly reduced; In addition, the adsorption rate of heavy metals has also been significantly improved, to achieve the integration of photocatalytic and membrane filtration.

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