Preparation method of multifunctional attapulgite composite membrane, the composite membrane, and applications
A composite membrane and attapulgite technology, which is applied in the field of oil-water separation, superhydrophilic/underwater superoleophobic membrane materials, can solve the problems of inability to remove water phase pollutants, achieve good separation efficiency and flux, and excellent physical and chemical properties , prepare simple effects
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[0010] The present invention relates to a preparation method of a multifunctional attapulgite composite film, a composite film and an application thereof. The preparation method of a multifunctional attapulgite composite film uses the purified attapulgite as a raw material and a polyvinyl alcohol solution as an additive to prepare a mixed suspension, and Based on the microfiltration membrane, a multifunctional attapulgite composite membrane was successfully prepared by a simple vacuum filtration method; the vacuum degree of vacuum filtration is 0.07-0.09MPa; the concentration of polyvinyl alcohol solution is 0.5 wt%.
[0011] In the preparation method of the multifunctional attapulgite composite membrane described above, the mixed suspension is stirred at room temperature for 2 to 4 hours.
[0012] The composite membrane prepared by the above-mentioned multifunctional attapulgite composite membrane preparation method presents a graded micro-nano rough structure under the scanni...
Embodiment 1
[0037] (1) Purification of attapulgite:
[0038] In order to remove impurities, Pal (10 g) was added into HCl (1 M), vigorously stirred at room temperature for about 4-6 hours, and then washed with deionized water until the pH was 6-7. Dry the residue in a blast oven at 40-60°C to obtain purified Pal, which is finally ground and passed through a 200-mesh sieve;
[0039] (2) Preparation of multifunctional attapulgite composite film:
[0040] Heat and stir the PVA, dissolve it in deionized water at 75-95 ℃, and prepare a 0.5 wt% PVA solution. Disperse 0.25 g Pal in deionized water, stir magnetically for about 30-40 min, and ultrasonicate for half an hour to obtain a uniform attapulgite dispersion. Then, 2 mL of PVA (0.5 wt%) aqueous solution was added to the Pal dispersion. The mixed dispersion was stirred at room temperature for 2 to 4 hours. Then the multifunctional attapulgite composite film was prepared by vacuum filtration method, and dried at room temperature.
Embodiment 2
[0042] (1) Preparation of oil-in-water emulsion: Add 0.04-0.06 g Tween 80 into a three-necked flask, then add deionized water and oil to mix at 50:1 (mL / mL), and stir at 600-1500 rpm After 6-12 hours, the desired emulsion is obtained;
[0043] (2) The oil-in-water emulsion described in the above step (1) includes kerosene-in-water, diesel oil-in-water, petroleum ether-in-water, and n-heptane-in-water emulsions;
[0044] (3) Put the multi-functional attapulgite composite membrane prepared in Example 1 in the oil-in-water emulsion separation system, slowly pour the oil-in-water emulsion into the system, and conduct a separation test at a pressure of 0.07-0.09 MPa. The results found that, After the emulsion passes through the prepared multifunctional attapulgite composite membrane, the obtained filtrate is clear and transparent, and the oil-in-water emulsion can be successfully separated, which is attributed to the superhydrophilicity and hierarchical micro-nano structure of the ...
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