Sodium alginate-flaky ZIF-8 hybrid composite membrane, and preparation and application thereof
A technology of ZIF-8 and sodium alginate, which is applied in the field of membrane separation, can solve the problems of selectivity decline, achieve high membrane stability, high permeation flux and separation factor, and improve separation performance
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Embodiment 1
[0022] Embodiment 1, sodium alginate-flaky ZIF-8 hybrid composite film, its preparation steps are as follows:
[0023] Step 1. Add sodium alginate to deionized water, stir at 30°C for 1 hour, prepare a sodium alginate solution with a mass concentration of 32%, and set aside;
[0024] Step two, with Zn(NO 3 ) 2 and 2-methylimidazole as raw materials, the water phase is prepared to obtain sheet ZIF-8, the specific process is: Zn(NO 3 ) 2 Dissolved in deionized water to prepare Zn(NO 3 ) 2 solution, 2-methylimidazole is dissolved in deionized water to prepare a concentration of 2-methylimidazole solution of 0.4mol / L, and the Zn(NO 3 ) 2 The solution and the 2-methylimidazole solution were mixed uniformly at a volume ratio of 1:1, and magnetically stirred at 600 rpm for 4 hours at 30°C to obtain a milky white suspension; the suspension was filtered with a cellulose acetate microfiltration membrane with a pore size of 0.2 μm, The filter cake was redispersed into deionized wa...
Embodiment 2
[0029]Embodiment 2, sodium alginate-flaky ZIF-8 hybrid composite film, its preparation procedure is basically the same as embodiment 1, the only difference is, in step 3, the consumption of flake ZIF-8 is accounted for sodium alginate 2wt.% is changed to account for 4wt.% of sodium alginate; The SEM surface photo of the finally obtained sodium alginate-flaky ZIF-8 hybrid composite film is as follows figure 2 shown.
[0030] The sodium alginate-sheet ZIF-8 hybrid composite membrane prepared in Example 2 was used to test the ethanol / water separation performance. Using membrane separation equipment, the ethanol / water pervaporation separation performance test was carried out at 76°C and the mass ratio of ethanol / water in the raw material solution was 9:1, and the permeation flux was 1218g / m 2 h, the separation factor is 1840.
Embodiment 3
[0031] Embodiment 3, sodium alginate-flaky ZIF-8 hybrid composite film, its preparation procedure is basically the same as embodiment 1, the only difference is that, in step 3, the consumption of flake ZIF-8 is accounted for sodium alginate 2wt.% is changed to account for 6wt.% of sodium alginate.
[0032] The sodium alginate-sheet ZIF-8 hybrid composite membrane prepared in Example 3 was used to test the ethanol / water separation performance. Using membrane separation equipment, the ethanol / water pervaporation separation performance test was carried out at 76°C and the mass ratio of ethanol / water in the raw material solution was 9:1, and the permeation flux was 1066g / m 2 h, the separation factor is 1222.
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