Sodium alginate hybrid membrane filled with hollow ZIF-8 nanoparticles as well as preparation and application of sodium alginate hybrid membrane
A ZIF-8, nanoparticle technology, applied in chemical instruments and methods, separation/purification of hydroxy compounds, membrane technology, etc., to achieve good operational stability, high permeation flux, and universal methods.
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Embodiment 1
[0022] Embodiment 1, preparation of hollow ZIF-8 nanoparticles filled sodium alginate hybrid membrane, the steps are as follows:
[0023] Step 1. Prepare a hollow ZIF-8 nanoparticle: Dissolve 390mg of zinc acetate dihydrate and 480mg of polyvinylpyrrolidone in 12ml of water, disperse the resulting aqueous solution in 720ml of n-octanol, and stir magnetically for 30min at 500r / min A homogeneous inverse emulsion was obtained. Dissolve 11.25g of 2-dimethylimidazole in 180ml of n-octanol, then add the n-octanol solution to the above-mentioned inverse emulsion and shake gently for a few seconds, then let it stand at room temperature for 24h to obtain a white precipitate; the white precipitate After centrifuging and washing with methanol, dry in a vacuum oven at 40-120°C for 12 hours, the obtained white powdery solid is the hollow ZIF-8 nanoparticle, specifically, the radial size of the particle is about 100-150nm, and the pore diameter is about 0.34nm. Hollow ZIF-8 nanoparticles. ...
Embodiment 2
[0026] Embodiment 2, preparation of sodium alginate hybrid membrane filled with hollow ZIF-8 nanoparticles, the steps are as follows:
[0027] The preparation process of Example 1 is basically the same, except that in step 2, the amount of the hollow ZIF-8 nanoparticles dissolved in 25mL deionized water is changed from 0.0076g to 0.0228g (that is, the hollow ZIF-8 nanoparticles and Sodium alginate is by mass ratio 6:100); Finally obtain the sodium alginate hybrid film (film 2) that hollow ZIF-8 nanoparticle fills, and the surface electron microscope figure of film 2 is as follows figure 2 shown.
[0028] Membrane 2 is used for pervaporation ethanol dehydration, and the permeation flux is 2485g / m under the conditions of 76°C and raw material concentration of 90 / 10wt% (ethanol / water) 2 h, the separation factor is 1885, such as Figure 5 shown.
Embodiment 3
[0029] Embodiment 3, preparing the sodium alginate hybrid membrane filled with hollow ZIF-8 nanoparticles, the steps are as follows:
[0030] The preparation process of Example 1 is basically the same, except that in step 2, the amount of the hollow ZIF-8 nanoparticles dissolved in 25mL deionized water is changed from 0.0076g to 0.038g (that is, the hollow ZIF-8 nanoparticles and Sodium alginate is by mass ratio 10:100); Finally obtain the sodium alginate hybrid film (film 3) that hollow ZIF-8 nanoparticle fills, and the surface electron microscope figure of film 3 is as follows image 3 shown.
[0031]Membrane 3 is used for pervaporation ethanol dehydration, and the permeation flux is 2610g / m under the conditions of 76°C and raw material concentration of 90 / 10wt% (ethanol / water) 2 h, the separation factor is 1224, such as Figure 5 shown.
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