Cellulose acetate forward osmotic membrane and preparation method thereof
A technology of cellulose acetate and forward osmosis membrane, applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve problems such as complex experimental methods, achieve good salt cut-off effect, increase salt cut-off rate, and small molecular weight Effect
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[0024] Example 1.
[0025] Step 1: Preparation of raw materials: 3.0g cellulose acetate, cellulose acetate molecular weight 40320g / mol, 52.5ml 1,4-dioxane, 22ml acetone, 8.2ml methanol, 6.6ml lactic acid;
[0026] Step 2: Add the solid and liquid weighed in step 1 to the round bottom flask and mix evenly. Stir mechanically at room temperature to completely dissolve the cellulose acetate to obtain the cellulose acetate casting solution. Leave the casting solution for more than 12 hours. It completely defoams;
[0027] Step 3: Soak the porous polysulfone membrane of JQE-3631-130326 produced by Shenzhen Jiaquan Membrane Filtration Equipment Co., Ltd. with a sodium hydroxide solution with a mass concentration of 10% for 30 minutes to remove impurities adsorbed on the surface. Then rinse with deionized water and dry it for later use;
[0028] Step 4: Soak the polysulfone membrane support layer obtained by pretreatment in step 3 in the casting solution of step 2 for 60 seconds, and then so...
Example Embodiment
[0032] Example 2.
[0033] Step 1: Preparation of raw materials: 3.3g cellulose acetate, cellulose acetate molecular weight 40320g / mol, 52.5ml 1,4-dioxane, 22ml acetone, 8.2ml methanol, 6.6ml lactic acid;
[0034] Step 2: Add the solid and liquid weighed in step 1 to the round bottom flask and mix evenly. Stir mechanically at room temperature to completely dissolve the cellulose acetate to obtain the cellulose acetate casting solution. Leave the casting solution for more than 12 hours. It completely defoams;
[0035] Step 3: Soak the porous polysulfone membrane with 10% sodium hydroxide solution to remove the impurities adsorbed on the surface, then wash it with deionized water and dry it for later use;
[0036] Step 4: Soak the support layer obtained by pretreatment in step 3 in the casting solution of step 2 for 60 seconds, and after pulling it once, soak it in deionized water for phase inversion for 6 hours;
[0037] Step 5: Place the membrane obtained in Step 4 in a water bath at 6...
Example Embodiment
[0040] Example 3.
[0041] Step 1: Preparation of raw materials: 3.3g cellulose acetate, cellulose acetate molecular weight 40320g / mol, 52.5ml 1,4-dioxane, 22ml acetone, 8.2ml methanol, 6.6ml lactic acid;
[0042] Step 2: Add the solid and liquid weighed in step 1 to the round bottom flask and mix evenly. Stir mechanically at room temperature to completely dissolve the cellulose acetate to obtain the cellulose acetate casting solution. Leave the casting solution for more than 12 hours. It completely defoams;
[0043] Step 3: Soak the porous polysulfone membrane with 10% sodium hydroxide solution to remove the impurities adsorbed on the surface, then wash it with deionized water and dry it for later use;
[0044] Step 4: Soak the support layer obtained by pretreatment in step 3 in the casting solution of step 2 for 60 seconds, and after pulling it once, soak it in deionized water for phase inversion for 6 hours;
[0045] Step 5: Place the membrane obtained in Step 4 in a water bath at 6...
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