Sodium alginate-graphite phase carbon nitride nano-sheet hybridized composite membrane as well as preparation and application of composite membrane
A technology of graphite phase carbon nitride and sodium alginate, applied in the field of membrane separation, can solve problems such as difficult and efficient separation, and achieve the effects of high separation performance, easy availability of raw materials and mild conditions
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Embodiment 1
[0018] Embodiment 1, a kind of sodium alginate-graphite carbon nitride nanosheet hybrid composite film, its preparation process is as follows:
[0019] Step 1. Add sodium alginate to deionized water and stir at 30°C for 2 hours to prepare a sodium alginate solution with a mass concentration of 1.5% for use;
[0020] Step 2, using melamine as raw material, using the method of combining thermal exfoliation and liquid phase exfoliation, to prepare graphitic carbon nitride nanosheets: put 5 g of melamine in a crucible, put it into a muffle furnace and bake it at 550 ° C for 4 hours, then heat up Both the heating rate and the cooling rate were controlled at 3°C / min to obtain a yellow powder; after grinding the yellow powder with a mortar, it was put into a muffle furnace and roasted at 500°C for 2h, and the heating rate and cooling rate were both controlled at 5°C / min. min to obtain graphite phase carbon nitride powder; at room temperature, disperse the graphite phase carbon nitrid...
Embodiment 2
[0025] Embodiment 2, a kind of sodium alginate-graphite phase carbon nitride nanosheet hybrid composite film, its preparation process is basically the same as embodiment 1, the only difference is that in step 3, the amount of graphite phase carbon nitride nanosheet by Accounting for 1wt.% of sodium alginate is changed to account for 2wt.% of sodium alginate.
[0026] The sodium alginate-graphite phase carbon nitride nanosheet hybrid composite membrane prepared in Example 2 was used to test the ethanol / water separation performance. Using membrane separation equipment, the ethanol / water 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 2232g / m 2 h, the separation factor is 1254.
Embodiment 3
[0027] Embodiment 3, a kind of sodium alginate-graphite phase carbon nitride nanosheet hybrid composite film, its preparation process is basically the same as embodiment 1, the only difference is that in step 3, the amount of graphite phase carbon nitride nanosheet by Accounting for 1wt.% of sodium alginate is changed to account for 3wt.% of sodium alginate. The high-magnification SEM cross-sectional photos of the sodium alginate-graphite phase carbon nitride nanosheet hybrid composite film finally obtained are as follows: figure 1 shown.
[0028] The sodium alginate-graphite phase carbon nitride nanosheet hybrid composite membrane prepared in Example 3 was used to test the ethanol / water separation performance. Using membrane separation equipment, the ethanol / water 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 2469g / m 2 h, the separation factor is 1653.
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