Method for performing fast in-situ conversion on microfiltration or ultrafiltration membrane into nanofiltration membrane
A technology of ultrafiltration membrane and nanofiltration membrane, which is applied in the field of membrane separation, can solve the problems of graphene oxide nanofiltration membrane application limitation, limited application, harsh reaction conditions, etc. Effect of unrestricted, high water flux and salt rejection
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[0021] Example 1
[0022] (1) Preparation of graphene oxide solution
[0023] The graphene oxide solution used in the present invention is prepared by using graphite powder as a raw material through an improved Hummer method combined with the peeling effect of ultrasonic treatment. The preparation process is as follows: 1 g of graphite powder is put into a beaker, and 60 mL of concentrated sulfuric acid and 0.5 g of sodium nitrate are added to the beaker. Then under ice-water bath and stirring conditions, slowly add 3g potassium permanganate (KMnO 4 ), the entire process temperature is controlled below 20°C. After completing the addition of potassium permanganate, transfer to a 35°C water bath for constant temperature reaction for 10 hours, add 3 g of potassium permanganate again, and continue constant temperature reaction for 12 hours. After the oxidation reaction is over, under the condition of ice water bath and stirring, slowly add deionized water to make 500mL, during this p...
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[0032] Example 2
[0033] The second nanofiltration membrane was prepared according to the method of Example 1, except that the amount of the diamine cross-linked graphene oxide solution was 50 mL. Nanofiltration membrane 2 was prepared and tested on the device described in Example 1 above. The water flux of the nanofiltration membrane prepared by the method of Example 2 was 41.6kg·m -2 ·H -1 ·MPa -1 , The removal rate of NaCl is 42.4%, and the removal rate of NaCl is 42.4%. 2 SO 4 The removal rate is 81.5%, and the removal rate of methyl orange is 96.6%.
Example Embodiment
[0034] Example 3
[0035] The nanofiltration membrane 3 was prepared according to the method of Example 1, except that the amount of the diamine cross-linked graphene oxide solution was 15 mL. Nanofiltration membrane three was prepared and tested on the device described in Example 1 above. The results showed that the water flux of the nanofiltration membrane prepared in Example 3 was 162.5 kg·m -2 ·H -1 ·MPa -1 , The removal rate of NaCl is 22.6%. 2 SO 4 The removal rate is 56.7%, and the removal rate of methyl orange is 80.5%.
[0036] The results of Examples 1 to 3 show that the method of the present invention can adjust the thickness of the graphene oxide membrane by changing the amount of the diamine-modified graphene oxide solution to prepare graphite oxide with high water flux or better separation performance. Ennan filter membrane to meet the needs of different uses.
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