Method for preparing PMIA mixed matrix film with photocatalytic performance through self-adhesion and application of PMIA mixed matrix membrane
A mixed-matrix membrane and photocatalytic technology, which is applied in the field of membrane separation, can solve the problems of membrane pore blockage and weakened anti-pollution ability, and achieve the effects of improving hydrophilicity, improving mechanical strength, and delaying recombination rate
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[0038] In the present embodiment, the preparation method of the photocatalytic performance PMIA film by self-adhesive method may further comprise the steps:
[0039] 1) Preparation of film casting solution: add co-solvent LiCl and PMIA to N,N-dimethylacetamide (DMAc) and stir at 50-100°C for 8-18h, after standing for defoaming, the described Casting solution, dip the casting solution into ZnO-Ag-TiO immediately after scraping 2 In the gel bath, the self-adhesion of the photocatalyst to the surface of the film is realized. The GO-ZnO-Ag nanocomposite material in this technical solution can be prepared by referring to the existing literature.
[0040] 2) PMIA mixed matrix membrane was prepared by non-solvent-induced phase separation method: the casting solution was scraped onto a glass plate with a thickness of 100-250 μm, and placed in a hydrogel bath at 15-30°C for phase separation. That is, the PMIA mixed matrix membrane was obtained.
[0041] Wherein, the gel bath is ZnO-A...
Embodiment 1
[0045] This embodiment is used to prepare PMIA mixed matrix film, and concrete preparation method is as follows:
[0046] 1) Dissolve 4.5g LiCl and 18g PMIA in DMAc, and stir at 50°C for 8h until fully dissolved, then stand for 6h for defoaming to obtain the casting solution;
[0047] 2) Squeegee-coat the casting solution on the glass plate with a thickness of 100 μm;
[0048] 3) Immerse the glass plate with the film solution in 0.2g / L ZnO-Ag-TiO 2 Self-adhesive phase separation in aqueous solution;
[0049] 4) The membrane after phase separation was transferred to deionized water for immersion to remove excess solvent, and then stored in clean deionized water to obtain a PMIA self-adhesive membrane, denoted as M1 ultrafiltration membrane.
[0050] SEM characterization of the obtained M1 ultrafiltration membrane was carried out, the results are as follows figure 1 shown. It can be seen from the figure that the cross-sectional surface of the membrane is dense, but has large...
Embodiment 2
[0052] This embodiment is used to prepare PMIA mixed matrix film, and concrete preparation method is as follows:
[0053] 1) Dissolve 4.5g LiCl and 15g PMIA in DMAc, and stir at 70°C for 10h until fully dissolved, then stand for 10h for defoaming to obtain the casting solution;
[0054] 2) Squeegee-coat the casting solution on the glass plate with a thickness of 150 μm;
[0055] 3) Immerse the glass plate with the casting solution into 0.5g / L ZnO-Ag-TiO 2 Self-adhesive phase separation in aqueous solution;
[0056] 4) Transfer the phase-separated membrane to deionized water for soaking to remove excess solvent, and then put it into clean deionized water for storage to obtain a PMIA mixed matrix membrane, which is denoted as an M2 ultrafiltration membrane.
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