High flux reverse osmosis membrane and its preparation method and application
A reverse osmosis membrane, high-throughput technology, used in reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc., to achieve the effects of good mechanical properties, thin thickness, and improved roughness
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[0035] As the preparation method of the high-flux reverse osmosis membrane containing the middle nano sacrificial layer of the present invention, specifically comprise the following steps:
[0036] (1) Prepare a polymer solution dispersed with inorganic silicate nanomaterials as a casting solution, coat it on a support material, and then immerse it in a coagulation bath to obtain a base film;
[0037] (2) Prepare dopamine / ZIF-8 suspension, immerse the basement membrane obtained in step (1) in the suspension, make dopamine / ZIF-8 grow on the basement membrane surface, then rinse, obtain the basement membrane with dopamine / ZIF-8 The modified base film of the -8 middle nano-layer;
[0038] (3) immersing the modified base membrane obtained in step (2) in an aqueous phase solution and an organic phase solution to carry out interfacial polymerization to prepare a polyamide functional layer, and obtain a composite reverse osmosis membrane native membrane with a polyamide functional la...
Embodiment 1
[0109] Preparation of polysulfone-based membrane
[0110] (1) Disperse 1wt% attapulgite in 40wt% N,N-dimethylformamide DMF in the ultrasonic state, disperse evenly after ultrasonic cleaning with a 300W ultrasonic cleaner for 3 hours, and use a microfiltration membrane with a pore size of 0.2 μm to reduce Pressure suction filtration, remove impurities, obtain DMF filtrate;
[0111](2) In the stirring state, add 1wt% polyvinylpyrrolidone to the filtrate, and use a stirring speed of 60r / min for stirring treatment, so that the polyvinylpyrrolidone is uniformly dispersed in the filtrate, and maintain the stirring speed to raise the temperature to 90°C, Add 18wt% polysulfone and 40wt% DMF to it, and stir for 4 hours to obtain a casting solution;
[0112] (3) Filtrate the casting solution after vacuum defoaming treatment at -80kPa, cool to room temperature, apply a scraper system evenly on the PP non-woven fabric substrate and enter the coagulation bath, the coagulation bath is 1....
Embodiment 2
[0122] A polysulfone-based membrane was prepared in the same manner as described in Example 1.
[0123] Preparation of modified polysulfone-based membrane loaded with dopamine / ZIF-8 nanolayer
[0124] (1) Under normal temperature environment, in the state of keeping stirring, will contain 0.13mol of Zn(NO 3 ) 2 ·6H 2 The mixed solution of 40mL methanol and 20mL water of O was quickly poured into 40mL methanol solution containing 0.45mol 2-methylimidazole, and stirred for 1h to obtain a milky white dispersion; add 50mg dopamine hydrochloride and 10mL0.1mol tromethamine Buffer solution (pH=8.5), stirred at room temperature for 5 hours to obtain a dark gray suspension;
[0125] (2) The attapulgite-modified polysulfone-based membrane was immersed in the above suspension and allowed to stand at room temperature for 12 hours, so that the dopamine / ZIF-8 nanoparticles grew on the surface of the polysulfone-based membrane. After taking it out, wash it repeatedly with distilled wa...
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