A preparation method of sulfonated polysulfone polymer doped carboxylic acid sulfonated graphene hybrid membrane and its products and applications
A technology of sulfonated polysulfones and acidified graphite, which is applied in the fields of alkali metal compounds, chemical instruments and methods, alkali metal oxides/hydroxides, etc., can solve the problem of lack of ion exchange function, poor dispersion of aqueous solution, and influence on graphene and other problems, to achieve the effect of favorable adsorption, low cost, and simple film-making conditions
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Embodiment 1
[0044] Preparation of Carboxylic Acid Sulfonated Graphene
[0045] 1) Graphene oxide was prepared by the Hummers' method. Add 300mL of concentrated sulfuric acid with a mass fraction of 98%, 5g of 100-mesh graphite powder and 2.5g of sodium nitrate into a 1L three-necked flask, place the flask in an ice bath and stir, then slowly add potassium permanganate in batches, Reaction in the bath for 1h. Move the flask to a constant temperature water bath at 60°C and react for 12 hours; slowly add 300mL of deionized water at 4°C to the reaction solution, then raise the temperature of the water bath to 95°C and react for 60 minutes; finally add 100mL of deionized water to the reaction solution Dilute it with water, then add 60mL of 30% hydrogen peroxide solution to terminate the reaction; after it cools down, wash it with 5% dilute hydrochloric acid solution for 3 times, then wash it with deionized water until the pH is neutral, and freeze-dry it after ultrasonication for 2h to obtain...
Embodiment 2
[0051] Add 1.05g of the carboxylic acid sulfonated graphene prepared in Example 1 to 68.70g of concentrated sulfuric acid, react at 180°C for 12h, then add 5.25g of PES (polyethersulfone resin), and stir at 60°C for 12h to obtain Uniform casting solution, let it stand overnight for degassing, scrape and coat the treated casting solution on a flat glass plate to form a flat film, then soak it in a coagulation bath for 20 minutes to solidify and form, and finally use deionized water again Soak and wash for 7 days, freeze-dry to obtain a hybrid membrane. The coagulation bath composition is H 2 O: DMAc = 2:1, the temperature of the coagulation bath is 5°C.
[0052] Add 15mg of the dried hybrid membrane adsorbent into a beaker filled with 20mL calcium and magnesium ion solution with a concentration of 1000mg / L, shake it for 24h at room temperature at 25°C, and calculate the adsorption capacity based on the concentration of the test solution. The results are shown in Table 1 .
Embodiment 3
[0054] The preparation method is consistent with Example 2, except that the quality of PES is 1.75g, the quality of concentrated sulfuric acid is 22.2g, and the coagulation bath composition is H 2 O:DMAc=1:1, coagulation bath temperature is 9°C.
[0055] The conditions for testing the adsorption capacity are the same as in Example 2, and the results are shown in Table 1.
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