A kind of high flux polyamide/zif-8 nanofiltration composite membrane and preparation method thereof
A technology of ZIF-8 and composite membrane, which is applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of MOFs agglomeration interface, defects, and affecting membrane separation performance, and achieve simple and feasible membrane production process. Effect of improving membrane performance and optimal selectivity
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[0023] The invention provides a PA / ZIF-8 membrane used for nanofiltration and separation of aqueous solutions and a preparation method thereof. First, ZIF-8 particles are grown on the surface of the ultrafiltration bottom membrane by in-situ growth method, and then PA / ZIF-8 dense skin layer is prepared by the interfacial polymerization method, and the composite membrane is obtained by post-processing.
[0024] The prepared PA / ZIF-8 nanofiltration membrane uses a flat membrane performance evaluation device to evaluate the separation performance of the separation aqueous system, that is, the permeation flux and rejection rate of the membrane.
[0025] 1) Permeation flux (J), the permeability of the reaction membrane, its definition is:
[0026] J=M / (A·t) or J=V / (A·t)
[0027] In the formula, M and V are the mass (kg) and volume (m 3 ); A is the membrane area, m 2 ; T is the operating time, h.
[0028] 2) Rejection rate (R), the selectivity of the reaction membrane, its definition formula...
Embodiment 1～4
[0032] 5.0g Zn(NO 3 ) 2 ·6H 2 O is dissolved in a mixture of 100ml methanol and 50ml water to make Zn(NO 3 ) 2 ·6H 2 O solution, 15.0g 2-methylimidazole dissolved in 100mL methanol to prepare 2-methylimidazole solution; add Zn(NO 3 ) 2 ·6H 2 The O solution was quickly poured into the 2-methylimidazole solution and stirred for 10 minutes to obtain a white ZIF-8 dispersion. The polyethersulfone ultrafiltration bottom membrane (with a molecular weight cut-off of 30000 Dal) was immersed in the dispersion liquid and allowed to stand for 12 hours at room temperature to make the ZIF-8 particles grow on the surface of the bottom membrane. The bottom film was taken out and rinsed repeatedly with distilled water and methanol, and then dried at 60°C for 2 hours to obtain a single growth bottom film of ZIF-8. Repeat the above-mentioned ZIF-8 growth process to prepare a base film for multiple growth of ZIF-8.
[0033] The flat membrane performance evaluation device was used to evaluate the pu...
Embodiment 5-8
[0037] At room temperature, the TMC monomer is dissolved in n-hexane to prepare a 0.1% (w / v) organic phase solution, and the MPD monomer is dissolved in ultrapure water to prepare a 2% (w / v) aqueous phase solution. The ultrafiltration bottom membranes of Comparative Example 1 and Examples 1 to 4 were respectively selected and immersed in the MPD aqueous solution for 2 minutes, and the bottom membrane in the aqueous solution was taken out to remove the excess water phase on the membrane surface; then the bottom membrane was placed in the TMC The interfacial polymerization reaction occurred in the organic phase solution for 20 seconds, and it was taken out and dried in the air, and then heat-treated at 60°C for 2 min. Finally, it was repeatedly washed with deionized water to obtain a nanofiltration membrane.
[0038] The flat membrane performance evaluation device is used to determine the separation performance of the nanofiltration membrane separation aqueous solution system: the f...
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