Preparation method of nanometer sio2/cellulose composite separation membrane
A cellulose and separation membrane technology, used in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems of uneven dispersion of matrix materials, unsatisfactory modification effect, and high chemical reactivity, etc. The effect of uniform internal structure distribution, improved film strength and uniformity, and improved mechanical properties
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Embodiment 1
[0037] Nano SiO of this embodiment 2 The preparation method of / cellulose composite separation membrane includes the following steps:
[0038] (1) Dissolve cellulose in ionic liquid to form casting film: mix fully dried cotton pulp with ionic liquid 1-ethyl-3-methylimidazole acetate, and dissolve at 90°C for 2h to prepare Into a casting liquid with a mass fraction of 4%.
[0039] (2) Preparation of nano-SiO 2 : Mix tetraethylorthosilicate and ethanol thoroughly at a volume ratio of 1:25 to obtain a reaction solution; add 25% ammonia water to the reaction solution, stir at room temperature for 1 min, and then at 60°C for 20 hours Transparent SiO 2 Gel solution; the volume of the reaction solution is 4% of the volume of ammonia; the obtained gel solution is heated and evaporated to obtain a gel, which is dried at 80° C. for 20 hours to obtain white nano SiO 2 powder.
[0040] (3) Use the silane coupling agent γ-(2,3-glycidoxy) propyl trimethoxy silane on the nano SiO 2 Modification: A...
Embodiment 2
[0052] Nano SiO of this embodiment 2 The preparation method of / cellulose composite separation membrane includes the following steps:
[0053] (1) Dissolve cellulose in ionic liquid to form casting film: mix fully dried cotton pulp with ionic liquid 1-ethyl-3-methylimidazole acetate, and dissolve at 80℃ for 2h to prepare Into a casting liquid with a mass fraction of 3%.
[0054] (2) Preparation of nano-SiO 2 : Mix tetraethyl orthosilicate and ethanol at a volume ratio of 1:50 to obtain a reaction solution; add 30% ammonia water to the reaction solution, stir at room temperature for 1 min, and then at 75°C for 25 hours Transparent SiO 2 Gel solution; the volume of the reaction solution is 9.3% of the volume of ammonia; the obtained gel solution is heated and evaporated to obtain a gel, which is dried at 100 ℃ for 25 hours to obtain white nano SiO 2 powder.
[0055] (3) Use the silane coupling agent γ-(2,3-glycidoxy) propyl trimethoxy silane on the nano SiO 2 Modification: Add 25mL of...
Embodiment 3
[0058] Nano SiO of this embodiment 2 The preparation method of / cellulose composite separation membrane includes the following steps:
[0059] (1) Dissolve cellulose in ionic liquid to form casting film: mix fully dried cotton pulp with ionic liquid 1-ethyl-3-methylimidazole acetate and dissolve it at 100°C for 3 hours to prepare Into a casting liquid with a mass fraction of 5%.
[0060] (2) Preparation of nano-SiO 2 : Mix tetraethyl orthosilicate and ethanol thoroughly at a volume ratio of 1:40 to obtain a reaction solution; add 25% ammonia water to the reaction solution, stir at room temperature for 3 minutes, and then at 45°C for 15 hours Transparent SiO 2 Gel solution; the volume of the reaction solution is 1.8% of the volume of ammonia; the obtained gel solution is heated and evaporated to obtain a gel, which is dried at 60° C. for 15 hours to obtain white nano SiO 2 powder.
[0061] (3) Use the silane coupling agent γ-(2,3-glycidoxy) propyl trimethoxy silane on the nano SiO 2 ...
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