Preparation method of hollow fiber membrane for dye desalination
A fiber membrane and desalination technology, which is applied in the field of preparation of hollow fiber membranes for dye desalination, can solve the problems of low retention rate of dye molecules by hollow fiber membranes, complex preparation process of composite membranes, and need to improve membrane stability. Achieve the effects of reducing membrane surface pollution, reducing dye desalination costs, and good mechanical strength
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Embodiment 1
[0025] Take 75g of DMAc and pour it into a 500ml three-neck flask, then add 1.8g of dry sodium borohydride, sonicate until it is completely dissolved, then add 3g of LiCl, continue to sonicate until it is completely dissolved, then add 0.2g of TiO 2 Ultrasonic disperse until completely dissolved, and finally add 20g PVDF, heat and stir in a 60°C water bath for 12 hours, and let it stand for defoaming for 24 hours to obtain a casting solution;
[0026] Put the casting solution into the syringe, submerge the needle into the first coagulation bath, push the syringe at a constant speed of 0.3mL / min, extrude the casting solution, and pull the extrudate through the first coagulation bath until the second coagulation bath, coiled, and then immersed in water to remove the residue to obtain the product; when the extrudate enters the second coagulation bath from the first coagulation bath, the skin has been cured;
[0027] Among them, the inner diameter of the syringe needle is 1.3mm, t...
Embodiment 2
[0039] Pour 80g of DMAc into a 500ml three-necked flask, then add 1.8g of dried sodium borohydride, sonicate until it is completely dissolved, then add 3g of LiCl, continue to sonicate until it is completely dissolved, then add 0.2g of TiO 2 Ultrasonic disperse until completely dissolved, and finally add 15g PVDF, heat and stir in a water bath at 60°C for 12 hours, and let stand for defoaming for 24 hours to obtain a casting solution;
[0040] Put the casting solution into the syringe, submerge the needle into the first coagulation bath, push the syringe at a constant speed of 0.3mL / min, extrude the casting solution, and pull the extrudate through the first coagulation bath until the second coagulation bath, coiled, and then immersed in water to remove the residue to obtain the product; when the extrudate enters the second coagulation bath from the first coagulation bath, the skin has been cured;
[0041] Among them, the inner diameter of the syringe needle is 1.3mm, the first...
Embodiment 3
[0044] Take 65g of DMAc and pour it into a 500ml three-necked flask, then add 1.8g of dry sodium borohydride, sonicate until it is completely dissolved, then add 3g of LiCl, continue to sonicate until it is completely dissolved, then add 0.2g of TiO 2 Ultrasonic disperse until completely dissolved, finally add 30g PVDF, heat and stir in a water bath at 60°C for 12 hours, and let stand for defoaming for 24 hours to obtain a casting solution;
[0045] Put the casting solution into the syringe, submerge the needle into the first coagulation bath, push the syringe at a constant speed of 0.3mL / min, extrude the casting solution, and pull the extrudate through the first coagulation bath until the second coagulation bath, coiled, and then immersed in water to remove the residue to obtain the product; when the extrudate enters the second coagulation bath from the first coagulation bath, the skin has been cured;
[0046] Among them, the inner diameter of the syringe needle is 1.3mm, the...
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